Yetman CB77

 

 
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Far left:Yetman frame number
Near Left: Frame measures 5" at the threaded crossmember near rear seat mounting area. Two frames were built for the CB77; a street frame and a competition frame (wider at this point).
  Yetman CB77 AHRMA race bike owned by Tim Mings of Team GBA. GP350 class winner in 2002 DO YOU HAVE PIX OF A YETMAN-FRAMED CB77 RACE BIKE? I CAN POST THEM HERE. NOT MANY AROUND AND THOSE THAT ARE, ARE HIGHLY MODIFIED, UNLIKE THIS ONE.
   

IN THE BEGINNING....
Everyone has to start somewhere. A rare frame with seat, tank and Airtech fairing makes the pile of used parts somewhat less daunting. Disassambly, cleaning & inspection followed by list of what's needed.

I THINK THIS WAS 2007.

STEERING AND SUSPENSION

Frame at Motoconsult in Willimantic CT.

Brought in:
alloy, stainless laced wheels
frame
NOS Redwing 34mm forks with hydraulic steering damper

They did:
assessment of frame for bracing needs (none needed)
modification of forks
mounting of new Progressive shocks (not shown)

These forks have a very short travel; might not have been a good choice.

 

Brake panels disassembled, cleaned blasted and reassembled with stock shoes on back, race compound shoes from John Branson on front.

Woodcraft clipons

Stock shifter and brake pedal assemblies; longer shifter rod fabricated from an extra engine stud.

Motor bottom end in, complete valve job done, cylinders bored for new, oversized pistons - all stock Honda parts.

Purchased rebuilt carburetors from Ed Moore. Awaiting late model re-machined clutch assembly from Ed Moore.

YETMAN TANK
Comes in two shells
Filler and fuel tap(s) to be purchased and frame mounts to be fabricated then glass them in, epoxy together the tank and seal inside. .

This part was completed by Matt Tanner; a fellow racer and fiberglass fabrication artist. Matt can also make you a reproduction Yetman style tank or seat pan, as well as other race bike body work.

THE MOTOR BUILD
Several top end builds to get it right, complete rebuild using another case after one of the (incorrect length) studs snapped off).

This stuff should occupy a HUGE spot to reflect time spent but it's over and much was learned.

Months went by while I regained motivation to work on it again. Couldn't have done this part without help from my husband J.

 

Here shown is a ubiquitous Honda tach; mounted to a custom mounting plate. I made a pattern and a local machine shop cut it out of titanium. Starter blockoff plate was a simple cutout made of aluminum flashing and cut with office scissors. Aftermarket mufflers fit great (came on an old CL77 I had). Battery bracket is from a CB350; pretty easy to mount to the frame with hardware store cable clamps. Special find are the CYB velocity stacks.

Everything's mounted (except tank in this pic). Do wiring, cam chain tensioner (on it's way), adjust and tighten, fill with oil, mount gas tank, add gas and START 'ER UP. Hopefully, the next photo will be of it out on the road being RIDDEN. And following that, AT THE TRACK.

Top image: took it to a track day but rode my NT650 instead. Bottom; first practice at the Sept.09 vintage race at Loudon NH; lost power after a few laps of NOT HARD runnnig. AWAY it goes until winter!

March 2010. Top end apart; broken and bent intake valves. Best expert opinion was that it was over-revved. Top end rebuild in progress with valves, springs seats and guides supplied by Vintage Advantage, and build by Pete Talabach. I will also be installing a rev limiter. This motor is still stock (carbs, transmission, cam, ignition) other than the new custom valve train.

Should be back on the track in May '10

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