Topic: CB72 or 77 racer

[Retro Rocket]

Talk to Jerry Brent, he's the man with those old jiggers...

Old jigger,  an old CB77 drag bike that hasn't been run since the early 70s is set to be restored and put back on track in England.
It was over bored to 330cc and ran a 9.05 back in the day, some old jigger, hahaha.

Hey, I didn't say us old, I mean those old jiggers were slow....    You should see Jerry's bikes Sam, they ain't slow either....

It might be Mick but I doubt it will run an 8 second quarter mile, hahaha.

I have some pics somewhere if you are interested Sam, its a work of art...

[Sam Green Racing]

Post away then Mick.

[Retro Rocket]

Post away then Mick.

I would if I could, I can't find the bloody things...     All I can find is this..




And this 500/4  Jerry built..


When I find the others I'll post them here...

[Sam Green Racing]

Awesome Mick. 

[teebee67]

Beat me to it Sam - that 500 4 is beautiful !!!

[bwaller]

That replica uses a CBX400, (Japan domestic) although knowing Jerry it probably displaces 500cc. On this bike he manufactured a gear drive ignition mounted where the e-starter would reside. Much serious & interesting work involved. Jerry is a self taught motorcycle genius. He pushed for me to change valve included angles in mine as if it was child's play.  The above bike has been resting since Jerry had a health scare and is learning how to live differently.  The other bikes were sold off.

I have some pics of his CB72 based bikes and the replica but can't figure out how to transfer the damn things.

[MRieck]

That replica uses a CBX400, (Japan domestic) although knowing Jerry it probably displaces 500cc. On this bike he manufactured a gear drive ignition mounted where the e-starter would reside. Much serious & interesting work involved. Jerry is a self taught motorcycle genius. He pushed for me to change valve included angles in mine as if it was child's play.  The above bike has been resting since Jerry had a health scare and is learning how to live differently.  The other bikes were sold off.

I have some pics of his CB72 based bikes and the replica but can't figure out how to transfer the damn things.

Just need a drill press Brent.

[bwaller]

Here's another guy that makes it sound like child's play.   

[Old Scrambler]

B........I have 2 or 3 damaged skulls you could use for practice

[bwaller]

Hell Dennis, I don't need to look far for one of those!

[Old Scrambler]

Gotcha........

[RAFster122s]

Redrilling and installing new faces for the valve seat would require more than a drill press right?  Would you Tig the head's old holes?  Don't quite understand how you can change the angle much given the rocker is pushing on the end of the valve right? How do you deal with it coming out at an angle? Or is it already at an angle?  The end of the rocker adjuster being round compensates enough?  Will either the adjuster or valve end wear badly by the greater angle? Presuming it will have a greater angle...

David

[Retro Rocket]

Hell Dennis, I don't need to look far for one of those!

Yep, I've got one of them too....

[RAFster122s]

So, that motor shown in Retro's images of Jerry's bikes are CBX400 motors most likely (given there was a 550 later... most don't go backwards on doing motor work...)
Wikipedia has next to zero on the CBX400 or anything on the JDM CBX550 or CBX750.  Wikipedia isn't very complementary to the US or anywhere's CBX either... But, unfortunately it didn't sell in the US as it probably would have 7-8 years later or 10 years later.
Imagine if the CB1100 (recent version) were to have the exhaust note and hp curve of the CBX.  Totally different sales curve would be seen.

How does one go about forming a sweeping increasing diameter exhaust as is shown... Formed in halves and welded together?
Very pretty. People would fall all over themselves were MotoGP to introduce a set of pipes like that.  They would rival the Seeley pipes but no way they would be inexpensive.  Those huge cans/silencers on the end are awesome. Those pipes and headers probably cost more than my bike.

David

[Retro Rocket]

So, that motor shown in Retro's images of Jerry's bikes are CBX400 motors most likely (given there was a 550 later... most don't go backwards on doing motor work...)
Wikipedia has next to zero on the CBX400 or anything on the JDM CBX550 or CBX750.  Wikipedia isn't very complementary to the US or anywhere's CBX either... But, unfortunately it didn't sell in the US as it probably would have 7-8 years later or 10 years later.
Imagine if the CB1100 (recent version) were to have the exhaust note and hp curve of the CBX.  Totally different sales curve would be seen.

How does one go about forming a sweeping increasing diameter exhaust as is shown... Formed in halves and welded together?
Very pretty. People would fall all over themselves were MotoGP to introduce a set of pipes like that.  They would rival the Seeley pipes but no way they would be inexpensive.  Those huge cans/silencers on the end are awesome. Those pipes and headers probably cost more than my bike.

David

You should get heaps of hits for the CBX550 and CBX750, We got both models here in Australia for 3 or 4 years...    There's probably not much CBX400/500 in that engine of Jerry's, I think the whole top end is hand made, he's a brilliant engineer and could easily build an engine from scratch, he's a very talented man as Brent will attest to.   

[RAFster122s]

Ran across a few articles in Motorcycle Classics archives while not CB72 or CB77 racer they are interesting still the same...

CB92
http://www.motorcycleclassics.com/classic-japanese-motorcycles/1961-honda-cb92-benly

Thought you might like to read this one...

[RAFster122s]

Surprised no one picked up on this one that showed up on ebay and ended yesterday.

http://www.ebay.com/itm/1964-Honda-CB-/322438123198
It was a Yetman framed CB72 race bike project that went for $2800.
It was gorgeous/is gorgeous. He modified the frame to bring the seat higher and align the Rickman tank to his liking. He was tall so he needed more height on the bike.  It was a very nice looking project that was at a good point. Imagine he lost a fortune on the bike going for so little.

Description:
This is one of those  finish-my-project auctions.  I've been collecting some of these parts for about a decade and has just never got it done.  Now too many projects and a two-car garage means this one is up for sale.

This is a PROJECT BIKE.  Even though it may look pretty much together, this bike needs A LOT OF WORK to be track ready.  This could also be a cool bike converted to street legal status.

Here's what I know about the bike you see here:
-Yetman Racing frame  (narrow racing version).  Insanely light space frame.  A similar bike was built and raced by Honda 305 Guru, Tim Mings with great success.
-Redwing 34mm forks (light surface pitting, nothing that will effect performance, Yamaha RD triple clamps, with tapered roller bearings.
-Honda CB77 front wheel, laced to WM2 18 alloy by Bucchanan's Spoke and Rim (Avon tire is old)
-Honda CB72 250cc engine, completely rebuilt.  I bought this engine from a Honda restoration shop about ten years ago.  It was built out as stock, using all NOS parts, completely rebuilt (including carbs).  The level of detail was so good that they even powder coated the cases and some other parts to create a perfect finish.  Though this is a 250cc engine, a 305, or even 350cc (Bore Tech or others) top end will bolt on.  This is a pretty rare engine, being a CB72.  Look at the pics to see that the stator assembly was removed (I was going to use an electronic ignition/stator), and the oil filter cover was removed (I was going to use an oil cooler that attached there)
-Custom megaphones patterned off of CYB77 specs
-CB77 Rear Wheel laced to WM3 alloy rim
-Stock CB77 swing arm and rear set pegs.
-Holtworks built Seeley tank, beautiful aluminum with Monza cap (never had gas in it)
-Airtech racing seat
-New Hagon Racing Shocks
-NOS throttle, clutch, and rear brake cables

I'm sure there is more and I will be adding to this list.  Please see the pics closely for the spares included and other details on the bike that I didn't mention here.  Again, THIS IS A PROJECT.  Just because it is in on piece doesn't mean you wont want to disassemble it and prepare it all yourself.   This is an assembled race bike from parts, there is NO TITLE.  The Yetman frame does not have it's original frame tag, so there are no numbers on it.  Please look closely at the pics to see what parts you will need (rear inner fender, and rear brake stay for example) and what you will need to do (secure seat and tank, etc).  The rear subframe/seat bracket was added by myself to accommodate my long legs and give the tank the proper stance.  This is removable and simple bolted to rear shock mounts and standard threaded battery tray mounts on the frame. 

If the buyer doesn't like the Seeley style tank and wants to use a proper Yetman tank (available from Tannermatic.com) I don't mind keeping the tank and I'll deduct $350 from the auction price.

Please ask questions if you have them!!!

Here's the pictures I pulled off ebay of it...

[bwaller]

It was exactly the project (I told myself) I wanted, was a bloody bargain, even had a friend with a pickup near there visiting. Just couldn't pull the trigger, too many irons in the fire. Will kick myself someday!

[RAFster122s]

yeah Brent, the fact it was that nice blue you like probably spoke to you as well...
Sometimes it is important to resist the urge.  It may have been a huge savings on one hand, but you might find it turns out for the best. It is the past now, so kicking yourself will not do you any good.  Never know, it might turn up again and the price be even better or as good.  It would have taken a lot more $ and time to make it viable. Better to focus on your bike and your son's bike this season.  You will have more funds to maybe have another race worked into the schedule or a vacation for the family...  Maybe go spectate and enjoy Barber later this year.

David

[RAFster122s]

Ran across this reading their small piece on the CBX.

http://www.cycleworld.com/honda-cb92-benly-125-twin-motorcycle-history-cycle-world-classics-remembered

[jaguar]

Here is a build thread (on another forum) that may have some interesting information...
www.caferacer.net/forum/project-builds/29554-cb77-project.html

Yup, that is a bike that I had for a short time.
Has some really interesting history and is really getting the love it deserves right now.

I have this waiting in the wings...

[bwaller]

Yes Jag, you've had the inside track on these hot setups.

[jaguar]

I have a major kink for these special framed bikes.

[turboguzzi]

Here is a build thread (on another forum) that may have some interesting information...
www.caferacer.net/forum/project-builds/29554-cb77-project.html

Yup, that is a bike that I had for a short time.
Has some really interesting history and is really getting the love it deserves right now.

I have this waiting in the wings...

looks very "tony foale" with all that triangulation... zehr cool

[jaguar]

Frame is an early Yetman