New Project! - ZX6R Forum
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post #1 of 12 Old 05-14-2017, 01:30 PM Thread Starter
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New Project!

So I picked up a 1982 Honda CB900C from a friends family this weekend, it was my friends dads project but he passed away at the end of last year. His mom new how into motorcycle I was and offered to give it to me if I wanted it, me being the motorcycle enthusiast I am didn't even consider no! It needs a lot of work but my main focus is to just get it to start and run. No plans are being made until after I do that. Once it runs and start I will look into paperwork(friends mom said it hasn't been registered since 83 haha. I'd say low mile engine, roughly 27,000.

If anyone has worked with this bike or has any tips to offer I'd appriciate them! Hahaha. Have never worked with carbs but my best friend has so he is helping me out with this lol






2012 Ninja ZX6R
Ohlins TTX MKII Rear Shock - Ohlins Steering Dampener - Yoshimura Carbon Fiber R77 Full System - Power Commander 5 tuned to 121rwhp - Schnitz ECU Flash - Zero Gravity Corsa Windscreen - Vortex Clip Ons - Core Moto SS Brakelines - Armour Bodies Track Fairings - Motion Pro Quick Turn Throttle - Woodcraft Case Savers LHS, RHS, Timing Cover - Driven Block Off Plates - Driven Gas Cap - Driven Sprockets and Sprocket Nuts - Servo Buddy - Ballistic 8-Cell Li Battery - SpeedoDRD

2007 ZX6R( Deceased 3/1/16 @ Laguna Seca )
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post #2 of 12 Old 05-14-2017, 01:51 PM
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That might be the model with the dual range transmission..... should be a lot of fun. I'd expect it to use screw and lock nut valve adjusters, and be as reliable as an anvil when you are done tuning it up. Shaft drive, solid state ignition -- around 80 HP, probably weighs near 600 lbs. Even the tires will be inexpensive.

Great find, will be interested in hearing how it comes together.

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post #3 of 12 Old 05-14-2017, 02:03 PM Thread Starter
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That might be the model with the dual range transmission..... should be a lot of fun. I'd expect it to use screw and lock nut valve adjusters, and be as reliable as an anvil when you are done tuning it up. Shaft drive, solid state ignition -- around 80 HP, probably weighs near 600 lbs. Even the tires will be inexpensive.

Great find, will be interested in hearing how it comes together.
Correct on the transmission it does have two sets of gears. From Hondas explanation it was meant to be a little of everything sport and cruiser, thus gears that are shorter to get up and go and gears that are taller so rpms stay low while cruising. I've never messed with valves so that shall be interesting, might just do that part with my mechanic hahaha. And hell yea around 600lbs took three beefy guys(myself included haha ) to get the damn thjng in my truck hahaha! I'm excited so far off to a good start connected a battery and everything is getting electricity!

2012 Ninja ZX6R
Ohlins TTX MKII Rear Shock - Ohlins Steering Dampener - Yoshimura Carbon Fiber R77 Full System - Power Commander 5 tuned to 121rwhp - Schnitz ECU Flash - Zero Gravity Corsa Windscreen - Vortex Clip Ons - Core Moto SS Brakelines - Armour Bodies Track Fairings - Motion Pro Quick Turn Throttle - Woodcraft Case Savers LHS, RHS, Timing Cover - Driven Block Off Plates - Driven Gas Cap - Driven Sprockets and Sprocket Nuts - Servo Buddy - Ballistic 8-Cell Li Battery - SpeedoDRD

2007 ZX6R( Deceased 3/1/16 @ Laguna Seca )
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post #4 of 12 Old 05-14-2017, 02:05 PM Thread Starter
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If I can get it to run and work properly converting it into a cafe racer will be the plan, but I won't be the typical hipster(millennial in San Francisco wearing a suit and half helmet with googles) riding this thing around hahaha
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2012 Ninja ZX6R
Ohlins TTX MKII Rear Shock - Ohlins Steering Dampener - Yoshimura Carbon Fiber R77 Full System - Power Commander 5 tuned to 121rwhp - Schnitz ECU Flash - Zero Gravity Corsa Windscreen - Vortex Clip Ons - Core Moto SS Brakelines - Armour Bodies Track Fairings - Motion Pro Quick Turn Throttle - Woodcraft Case Savers LHS, RHS, Timing Cover - Driven Block Off Plates - Driven Gas Cap - Driven Sprockets and Sprocket Nuts - Servo Buddy - Ballistic 8-Cell Li Battery - SpeedoDRD

2007 ZX6R( Deceased 3/1/16 @ Laguna Seca )
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post #5 of 12 Old 05-14-2017, 03:02 PM
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Great find and good luck with it. We just finished doing a cafe racer build on a '74 750. I will see if I can put some pics up which may give some inspiration.
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post #6 of 12 Old 05-14-2017, 03:09 PM
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Just don't spend your "track day fund" on getting this fixed up. This could easily turn into a money pit depending how crazy you want to get with it.
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post #7 of 12 Old 05-14-2017, 04:00 PM Thread Starter
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Just don't spend your "track day fund" on getting this fixed up. This could easily turn into a money pit depending how crazy you want to get with it.
There is no way in hell thats going to happen hahahaha!! My trackbike and passion will still come first lol.
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2012 Ninja ZX6R
Ohlins TTX MKII Rear Shock - Ohlins Steering Dampener - Yoshimura Carbon Fiber R77 Full System - Power Commander 5 tuned to 121rwhp - Schnitz ECU Flash - Zero Gravity Corsa Windscreen - Vortex Clip Ons - Core Moto SS Brakelines - Armour Bodies Track Fairings - Motion Pro Quick Turn Throttle - Woodcraft Case Savers LHS, RHS, Timing Cover - Driven Block Off Plates - Driven Gas Cap - Driven Sprockets and Sprocket Nuts - Servo Buddy - Ballistic 8-Cell Li Battery - SpeedoDRD

2007 ZX6R( Deceased 3/1/16 @ Laguna Seca )
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post #8 of 12 Old 05-14-2017, 04:03 PM
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Looks a lot like my dads' 750 custom
the quad exhaust system is a real head turner!
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post #9 of 12 Old 05-14-2017, 05:43 PM
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I have a 1981 CB750C, it's the same DOHC design, maybe even the same carbs. If you have any questions about carbs or valvetrain, I may know.
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post #10 of 12 Old 05-14-2017, 06:22 PM Thread Starter
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I have a 1981 CB750C, it's the same DOHC design, maybe even the same carbs. If you have any questions about carbs or valvetrain, I may know.
I may be sending you a message or two when I come to a snag my friend!
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2012 Ninja ZX6R
Ohlins TTX MKII Rear Shock - Ohlins Steering Dampener - Yoshimura Carbon Fiber R77 Full System - Power Commander 5 tuned to 121rwhp - Schnitz ECU Flash - Zero Gravity Corsa Windscreen - Vortex Clip Ons - Core Moto SS Brakelines - Armour Bodies Track Fairings - Motion Pro Quick Turn Throttle - Woodcraft Case Savers LHS, RHS, Timing Cover - Driven Block Off Plates - Driven Gas Cap - Driven Sprockets and Sprocket Nuts - Servo Buddy - Ballistic 8-Cell Li Battery - SpeedoDRD

2007 ZX6R( Deceased 3/1/16 @ Laguna Seca )
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post #11 of 12 Old 05-14-2017, 08:31 PM
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Congrats!

If you're going to start taking it apart it might be good to have some re-thread and helicoils (or whatever *-sert you prefer) on hand. There are always surprises with used vehicles when it comes to finding cross-threaded and stripped out bolts and holes.

Martillo y Mantequilla #99
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post #12 of 12 Old 05-15-2017, 05:24 AM
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When you get far enough through this process to start trying to sort out the rear suspension, you may find that is more difficult than you expected.

This is almost certainly going to be due to the shaft drive system Honda used on that bike. I owned a 1985 VF1100S and rode it through 52K miles, and the suspension was the weakest link on that bike, IMHO.

Due to the power of my bike, the drive shaft would try and 'crawl' up the pinion gear in the rear hub. That would cause the housing of the shaft to be torqued 'up', which extended the rear suspension. This was primarily due to the relatively short shaft housing used on my VF1100S -- it also occurred on the Magna, and most of the Shadows in that time frame as well.

The solution has been to use a longer wheel base, which reduces the leverage available, and to only apply shaft systems on bikes with relatively low power.

BMW, and Motoguzzi both went another way, to get around this.... the paralever rear suspension system adds another U joint at the rear hub, and cuts the shaft housing off of the hub. the hub is then given another brace back to the frame to absorb the torque, rather than feeding it into the suspension.

The potential fixes are limited, without redesigning the hub and drive system -- about all you can do is make the rear suspension stiffer, which will make the ride harder.....

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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