1978 HONDA CB750K FOUR
SOLD
THIS UNIT HAS SOLD AND IS NO LONGER AVAILABLE.
Description
1978 Honda CB750K Four
Rare Mint Original With Low Miles
The Classic Last Year of the SOHC Icon
Turnkey, Fully Serviced, Tuned & Detailed
Please Watch The Video Above For Full Details
Up for auction is a true legend—the final evolution of Honda’s groundbreaking CB750 Four. This 1978 Honda CB750K (K8) represents the last year of the original single overhead cam (SOHC) inline-four that changed motorcycling forever when it debuted in 1969 as the world’s first superbike.
This is not your typical “needs a carb clean” CB750—this is a fully serviced, professionally dialed-in, turnkey example with extensive mechanical restoration and preservation of its originality.
Highlights & Performance
-
Final year of the iconic SOHC CB750 platform
-
736cc air-cooled inline four-cylinder
-
~67 horsepower / 5-speed transmission
-
Top speed approx. 120 mph
-
Smooth, torque-rich powerband—pulls like a freight train
-
Legendary Honda reliability and refinement
This bike retains its original survivor character with:
-
Original fuel tank (factory paint with patina)
-
Original side panels and saddle
-
Original carburetors and airbox
-
Original chrome and cycle components throughout
Upgraded with a new Delkevic stainless steel 4-into-1 exhaust,
delivering an absolutely intoxicating exhaust note and improved performance.
Extensive Mechanical Restoration (77 Hours / $13,000+ Investment)
This CB750 was serviced by senior technician Mark Olson (40+ years experience) and underwent a comprehensive, no-expense-spared mechanical restoration:
Fuel System (Fully Rebuilt)
-
Carburetors completely disassembled, ultrasonically cleaned, rebuilt
-
New float valves, jets, seals & accelerator pump diaphragm
-
Bench synchronized + final vacuum sync
-
New fuel lines, inline filter
-
Petcock serviced
-
Fuel tank interior cleaned & Resealed by previous owner
Engine & Tuning
-
Re-jetted for New Delkevic Stainless Performance Exhaust (118 mains)
-
Pilot jets micro-drilled and dialed
-
Mixture screws set to 2.5 turns
-
Runs exceptionally strong and smooth
Suspension & Chassis
-
Front forks rebuilt (new seals, oil & wipers)
-
Bearings cleaned/lubed throughout
-
New drive chain
-
Wheels serviced, balanced
Brakes & Controls
-
Brake system rebuilt and adjusted
-
New DOT4 fluid
-
Cables cleaned, lubed, adjusted
-
New choke cable
Electrical System
-
Full wiring harness cleaned and serviced
-
All connectors cleaned
-
Bulbs replaced as needed
-
Charging system verified
-
All lights, signals, horn fully functional
Additional New Parts
-
New battery
-
New spark plug caps
-
New air filter
-
New OEM Honda grips
-
New Replica mirrors
-
New Fuel cap gasket, mounts & seals
-
Multiple New OEM hardware and rubber components
Cosmetic Condition – Original Survivor with Detail Work
This bike also received a 32-hour professional rotisserie detail, including:
-
Polished aluminum engine covers (mirror finish)
-
Cleaned and restored chrome components
-
Vapor-honed hubs and refinished select components
-
Frame, swingarm, and small parts refinished where appropriate
Important Notes:
-
Tank retains original paint with minor imperfections (clear coat repair visible)
-
Small crack on side cover (left original for authenticity)
-
Chrome shows light patina consistent with age
-
Overall: excellent presentation for a 48-year-old motorcycle
Value & Investment
-
Entry-level CB750s: $3K–$5K (project barn finds or “runners”)
-
Clean examples: ~$7K+
-
Turnkey, professionally sorted bikes like this: 10k+ & increasingly rare
Over $13,000 invested in service and detailing alone—not including acquisition cost.
If you have the time, tools, and expertise, you could build one like this.
If you don’t—this is your chance to own one already done right.
Collectability
-
Final year of the original CB750 SOHC platform
-
Foundation of AMA Superbike racing
-
Built from the same DNA that tuners like Pop Yoshimura used to dominate racing
-
Values steadily rising—especially for clean, original examples
Financing & Shipping
-
Financing available
-
Nationwide enclosed, insured shipping available
-
White-glove concierge service handled by our team
Final Word
This is a labor-of-love CB750K that has been brought to a level most never reach—mechanically sorted, beautifully detailed, and preserving its originality where it counts.
If you’re looking for a CB750 you can ride, enjoy, and invest in, without spending months chasing gremlins—this is it.
We stand behind what we sell.
Buy with confidence.
God Bless America
WHY SHOULD YOU BUY FROM KAPLAN? WHAT DO YOU GET?
“You are buying from the Kaplan Cycles Family. We are not just another big auction house. We are family-owned and operated and have been buying, servicing, and selling motorcycles since 1975. You will work directly with Ken Jr., Ken Sr., and/or one of the 30+ experts on our team. We provide museum-quality, white-glove concierge service from start to finish. Every motorcycle we sell is inspected, serviced, and supported by our team, and we stand behind it after the sale. You’re not on your own — we back what we build and what we sell.
With over 17,000 units sold and still 100% positive feedback, we are the best stress-free buying experience you can have. From the first call to delivery at your door, we will handle it all — because vintage motorcycles deserve support, and so do you.
With every bike we curate you get:
• museum-level inspection & preservation services
• every machine is professionally evaluated, serviced, & rotisserie detailed
• all critical systems are checked, adjusted, or renewed
• you get professional setup, tuning, and delivery prep
• done by the best experts in the industry — we ride and restore every day
• you get post-sale phone support
• you get white-glove, insured, always-enclosed shipping to your door anywhere in the country
You’re buying from Kaplan Cycles at the New England Motorcycle Museum, one of the largest vintage motorcycle collections in North America. Free museum tours and tickets are included with every bike sold. With every bike you purchase, a portion of the proceeds is used to support, continue, and improve the 501(c)(3) nonprofit New England Motorcycle Museum.
You don’t just win an auction — YOU are creating & helping to preserve motorcycle history, and you become part of our family, a Kaplan Cycles client for life.
We do not take new clients off the street.
We do not service bikes purchased elsewhere.
We only take new exclusive clients who purchase a motorcycle from us.
You get a guided purchase experience with, and from, the experts who care about the bike as much as you do. If there’s a problem, you don’t get ghosted. You call us — you will have our cell phone numbers — we will answer your call on weekends, and we will help make it right.
Auction platforms = listing only. No support. No accountability.
Kaplan Cycles = we stand behind what we sell.
You are buying museum-curated provenance. That means:
• expert evaluation
• documented condition
• professional presentation
• long-term preservation mindset
You’re not just buying a motorcycle — you’re buying a curated piece of motorcycling history.
From the #1 family in this business — Kaplan Cycles & the New England Motorcycle Museum.
Sincerely,
Ken Kaplan Sr.
12/28/2025”
AUCTION TERMS:
All motorcycles & vehicles are sold as-is where-is.
Kaplan Cycles guarantees all motorcycles are as-described. Please read the entire description and watch the entire video before bidding.
A non-refundable deposit is due immediately on purchase. PayPal or Credit Card is accepted for the deposit.
Cash (In-Person), Card (+3% fee), or Wire Transfer are our only accepted forms of final payment.
Full payment must be made within 7 days of auction close.
Your motorcycle must be picked up within 30 days of auction close.
Exceptions are made only for international buyers OR buyers who have ALREADY made transport arrangements with a third party.
If a motorcycle is purchased and left here for longer than 30 days without written permission from Kaplan Cycles it will be resold. In the case of a re-sale, the owner will be entitled to a refund less storage fees ($25/ day beginning 30 days from auction close) ONLY if the motorcycle was paid in full on-time within the auction terms.
We always describe our motorcycles as accurately as possible.
You are purchasing a classic motorcycle. Even in cases where a bike may be in good running/ operating condition, new problems & idiosyncrasies can arise over-time from sitting or regular use.
If you have an issue with the motorcycle you’ve received, contact us within 24 hours of delivery and before leaving feedback so that we can address your concerns.
It is important you have at least a basic mechanical knowledge before purchasing and operating a classic motorcycle.
Due to our backlog, we cannot perform any additional service work or modifications on your motorcycle after the sale (ie; adding a light kit, different tires, etc.)
We respond quickly between the hours of 9am and 5pm EST, Monday - Friday
For our fastest service please call Ken Kaplan Jr directly at 860-471-0192
We will not charge out-of-state buyers sales tax.
Out of state residents will pay sales tax with their DMV.
We are not a registering dealership. You will receive only the documents required to register your vehicle in your state.
In our listings, title status is always listed directly below the main description.
In some cases we will sell motorcycles without title or registration. In these cases we guarantee all motorcycles sold are free and clear. We will always provide a route to obtaining title. Generally in these cases, the motorcycle will be sold at a discount to accommodate expenses involved.
Documents are mailed via USPS priority mail with a tracking number. Please allow up to 14 days after payment in full for your documents to be processed and mailed.
Keys will be shipped with the motorcycle.
Warranty:
All Motorcycles sold "as is, where is" and Kaplan Cycles does not warranty any motorcycle sold. No express warranty and/or implied warranty are made by Kaplan Cycles. No statements by us give an implied warranty.
SHIPPING:
SEND US YOUR ZIP FOR A SHIPPING QUOTE!
WE WILL MAKE ALL ARRANGEMENTS!
We have the best shipping contacts in the nation who will provide the FASTEST transport times, have a perfect track record, and are always insured and ENCLOSED! All motorcycles are shipped WHOLE (roll-on, roll-off). We do not offer a pallet or crate service.
International shipping specialist contacts are available! They will assist in ground freight, customs clearance, and ocean freight to your country. International buyers will be required to work directly with our third party shipping contacts.
We strongly recommend you insure your motorcycle at the time of purchase.
PICKUP:
We require a 24 hour notice prior to pick-up. Please call us at 860-454-7024 during office hours Monday – Friday 9am – 5pm EST.
We will provide ramps, a dock for loading, and assistance to load for free.
Wheels
1978 Honda CB750K Four
Rare Mint Original With Low Miles
The Classic Last Year of the SOHC Icon
Turnkey, Fully Serviced, Tuned & Detailed
Please Watch The Video Above For Full Details
Up for auction is a true legend—the final evolution of Honda’s groundbreaking CB750 Four. This 1978 Honda CB750K (K8) represents the last year of the original single overhead cam (SOHC) inline-four that changed motorcycling forever when it debuted in 1969 as the world’s first superbike.
This is not your typical “needs a carb clean” CB750—this is a fully serviced, professionally dialed-in, turnkey example with extensive mechanical restoration and preservation of its originality.
Highlights & Performance
-
Final year of the iconic SOHC CB750 platform
-
736cc air-cooled inline four-cylinder
-
~67 horsepower / 5-speed transmission
-
Top speed approx. 120 mph
-
Smooth, torque-rich powerband—pulls like a freight train
-
Legendary Honda reliability and refinement
This bike retains its original survivor character with:
-
Original fuel tank (factory paint with patina)
-
Original side panels and saddle
-
Original carburetors and airbox
-
Original chrome and cycle components throughout
Upgraded with a new Delkevic stainless steel 4-into-1 exhaust,
delivering an absolutely intoxicating exhaust note and improved performance.
Extensive Mechanical Restoration (77 Hours / $13,000+ Investment)
This CB750 was serviced by senior technician Mark Olson (40+ years experience) and underwent a comprehensive, no-expense-spared mechanical restoration:
Fuel System (Fully Rebuilt)
-
Carburetors completely disassembled, ultrasonically cleaned, rebuilt
-
New float valves, jets, seals & accelerator pump diaphragm
-
Bench synchronized + final vacuum sync
-
New fuel lines, inline filter
-
Petcock serviced
-
Fuel tank interior cleaned & Resealed by previous owner
Engine & Tuning
-
Re-jetted for New Delkevic Stainless Performance Exhaust (118 mains)
-
Pilot jets micro-drilled and dialed
-
Mixture screws set to 2.5 turns
-
Runs exceptionally strong and smooth
Suspension & Chassis
-
Front forks rebuilt (new seals, oil & wipers)
-
Bearings cleaned/lubed throughout
-
New drive chain
-
Wheels serviced, balanced
Brakes & Controls
-
Brake system rebuilt and adjusted
-
New DOT4 fluid
-
Cables cleaned, lubed, adjusted
-
New choke cable
Electrical System
-
Full wiring harness cleaned and serviced
-
All connectors cleaned
-
Bulbs replaced as needed
-
Charging system verified
-
All lights, signals, horn fully functional
Additional New Parts
-
New battery
-
New spark plug caps
-
New air filter
-
New OEM Honda grips
-
New Replica mirrors
-
New Fuel cap gasket, mounts & seals
-
Multiple New OEM hardware and rubber components
Cosmetic Condition – Original Survivor with Detail Work
This bike also received a 32-hour professional rotisserie detail, including:
-
Polished aluminum engine covers (mirror finish)
-
Cleaned and restored chrome components
-
Vapor-honed hubs and refinished select components
-
Frame, swingarm, and small parts refinished where appropriate
Important Notes:
-
Tank retains original paint with minor imperfections (clear coat repair visible)
-
Small crack on side cover (left original for authenticity)
-
Chrome shows light patina consistent with age
-
Overall: excellent presentation for a 48-year-old motorcycle
Value & Investment
-
Entry-level CB750s: $3K–$5K (project barn finds or “runners”)
-
Clean examples: ~$7K+
-
Turnkey, professionally sorted bikes like this: 10k+ & increasingly rare
Over $13,000 invested in service and detailing alone—not including acquisition cost.
If you have the time, tools, and expertise, you could build one like this.
If you don’t—this is your chance to own one already done right.
Collectability
-
Final year of the original CB750 SOHC platform
-
Foundation of AMA Superbike racing
-
Built from the same DNA that tuners like Pop Yoshimura used to dominate racing
-
Values steadily rising—especially for clean, original examples
Financing & Shipping
-
Financing available
-
Nationwide enclosed, insured shipping available
-
White-glove concierge service handled by our team
Final Word
This is a labor-of-love CB750K that has been brought to a level most never reach—mechanically sorted, beautifully detailed, and preserving its originality where it counts.
If you’re looking for a CB750 you can ride, enjoy, and invest in, without spending months chasing gremlins—this is it.
We stand behind what we sell.
Buy with confidence.
God Bless America
WHY SHOULD YOU BUY FROM KAPLAN? WHAT DO YOU GET?
“You are buying from the Kaplan Cycles Family. We are not just another big auction house. We are family-owned and operated and have been buying, servicing, and selling motorcycles since 1975. You will work directly with Ken Jr., Ken Sr., and/or one of the 30+ experts on our team. We provide museum-quality, white-glove concierge service from start to finish. Every motorcycle we sell is inspected, serviced, and supported by our team, and we stand behind it after the sale. You’re not on your own — we back what we build and what we sell.
With over 17,000 units sold and still 100% positive feedback, we are the best stress-free buying experience you can have. From the first call to delivery at your door, we will handle it all — because vintage motorcycles deserve support, and so do you.
With every bike we curate you get:
• museum-level inspection & preservation services
• every machine is professionally evaluated, serviced, & rotisserie detailed
• all critical systems are checked, adjusted, or renewed
• you get professional setup, tuning, and delivery prep
• done by the best experts in the industry — we ride and restore every day
• you get post-sale phone support
• you get white-glove, insured, always-enclosed shipping to your door anywhere in the country
You’re buying from Kaplan Cycles at the New England Motorcycle Museum, one of the largest vintage motorcycle collections in North America. Free museum tours and tickets are included with every bike sold. With every bike you purchase, a portion of the proceeds is used to support, continue, and improve the 501(c)(3) nonprofit New England Motorcycle Museum.
You don’t just win an auction — YOU are creating & helping to preserve motorcycle history, and you become part of our family, a Kaplan Cycles client for life.
We do not take new clients off the street.
We do not service bikes purchased elsewhere.
We only take new exclusive clients who purchase a motorcycle from us.
You get a guided purchase experience with, and from, the experts who care about the bike as much as you do. If there’s a problem, you don’t get ghosted. You call us — you will have our cell phone numbers — we will answer your call on weekends, and we will help make it right.
Auction platforms = listing only. No support. No accountability.
Kaplan Cycles = we stand behind what we sell.
You are buying museum-curated provenance. That means:
• expert evaluation
• documented condition
• professional presentation
• long-term preservation mindset
You’re not just buying a motorcycle — you’re buying a curated piece of motorcycling history.
From the #1 family in this business — Kaplan Cycles & the New England Motorcycle Museum.
Sincerely,
Ken Kaplan Sr.
12/28/2025”
AUCTION TERMS:
All motorcycles & vehicles are sold as-is where-is.
Kaplan Cycles guarantees all motorcycles are as-described. Please read the entire description and watch the entire video before bidding.
A non-refundable deposit is due immediately on purchase. PayPal or Credit Card is accepted for the deposit.
Cash (In-Person), Card (+3% fee), or Wire Transfer are our only accepted forms of final payment.
Full payment must be made within 7 days of auction close.
Your motorcycle must be picked up within 30 days of auction close.
Exceptions are made only for international buyers OR buyers who have ALREADY made transport arrangements with a third party.
If a motorcycle is purchased and left here for longer than 30 days without written permission from Kaplan Cycles it will be resold. In the case of a re-sale, the owner will be entitled to a refund less storage fees ($25/ day beginning 30 days from auction close) ONLY if the motorcycle was paid in full on-time within the auction terms.
We always describe our motorcycles as accurately as possible.
You are purchasing a classic motorcycle. Even in cases where a bike may be in good running/ operating condition, new problems & idiosyncrasies can arise over-time from sitting or regular use.
If you have an issue with the motorcycle you’ve received, contact us within 24 hours of delivery and before leaving feedback so that we can address your concerns.
It is important you have at least a basic mechanical knowledge before purchasing and operating a classic motorcycle.
Due to our backlog, we cannot perform any additional service work or modifications on your motorcycle after the sale (ie; adding a light kit, different tires, etc.)
We respond quickly between the hours of 9am and 5pm EST, Monday - Friday
For our fastest service please call Ken Kaplan Jr directly at 860-471-0192
We will not charge out-of-state buyers sales tax.
Out of state residents will pay sales tax with their DMV.
We are not a registering dealership. You will receive only the documents required to register your vehicle in your state.
In our listings, title status is always listed directly below the main description.
In some cases we will sell motorcycles without title or registration. In these cases we guarantee all motorcycles sold are free and clear. We will always provide a route to obtaining title. Generally in these cases, the motorcycle will be sold at a discount to accommodate expenses involved.
Documents are mailed via USPS priority mail with a tracking number. Please allow up to 14 days after payment in full for your documents to be processed and mailed.
Keys will be shipped with the motorcycle.
Warranty:
All Motorcycles sold "as is, where is" and Kaplan Cycles does not warranty any motorcycle sold. No express warranty and/or implied warranty are made by Kaplan Cycles. No statements by us give an implied warranty.
SHIPPING:
SEND US YOUR ZIP FOR A SHIPPING QUOTE!
WE WILL MAKE ALL ARRANGEMENTS!
We have the best shipping contacts in the nation who will provide the FASTEST transport times, have a perfect track record, and are always insured and ENCLOSED! All motorcycles are shipped WHOLE (roll-on, roll-off). We do not offer a pallet or crate service.
International shipping specialist contacts are available! They will assist in ground freight, customs clearance, and ocean freight to your country. International buyers will be required to work directly with our third party shipping contacts.
We strongly recommend you insure your motorcycle at the time of purchase.
PICKUP:
We require a 24 hour notice prior to pick-up. Please call us at 860-454-7024 during office hours Monday – Friday 9am – 5pm EST.
We will provide ramps, a dock for loading, and assistance to load for free.
