SOHC.co.uk Forums > CB350/400

the story continues

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ttr400:
Hi.

The 54mm and the 54.5mm pistons are OK with the stock sleeves. 54mm =458cc. 54.5mm=466cc.
Some info for you.
Stock sleeve:
Upper OD= 59mm
Lower OD=57mm
Upper wall with 54mm pistons=2.5mm, lower=1.5mm
Upper wall with 54.5mm pistons=2.25mm, lower=1.25mm

The 54.5mm is the largest I would go with stock sleeves.

Any more info on where to get those 54mm pistons you have?

Kevin

rigwit:
00 raceing
and link to the piston is .............   http://www.ooracing.com/store/index.php?act=viewProd&productId=1396

and part of the e mail recived (i had already worked out the cc b4 this though)


If you give us the stroke we can work out the CC
They are made by a company for our engines OOR branded
We run them up to 13000 rpm with our engines.

Yoshi823:

--- Quote from: UK Pete on November 24, 2010, 10:10:33 PM ---
--- Quote from: rigwit on November 24, 2010, 09:42:36 PM --- so be a nice xmass gift to myself methinks ...........

--- End quote ---

I like the thinking i will have to go and buy myself some xmas presents as well, ;D ;D ;D

--- End quote ---

Isn't it called 'retail therapy' by those of the female type of humans...?

z1100r:

--- Quote from: rozabikes on November 23, 2010, 08:32:23 PM ---Wasn't the yoshi kit for these 460cc - so similar bore? Were these reliable?

--- End quote ---

Yes, very reliable and I think at the time performance % wise the 460 kit was the best kit Yoshimura did. Ok, I know a 400 wasn't the fastest think on the planet to start with but the pep up with just a R&T cam and 60cc's was incredible. There were alot of 460's in racing at one time so I'm surprised I don't see more 400-4's advertised with 460's.  If I got the gearing wrong - which I did at Silvertone once - mine would rev to 13,500+.

 I never saw one of those Futura 500's with Carrillo rods and god knows what but I hear they were quick. My 460 was on a par with a Stan Stevens tuned Yamaha 350LC...my bigger 500/550 bored to 600 was on a par with the later stock fully fared Powervalve 350's. A fully tuned later fully fared 350 F1/F2  powervalve would annihilate both of them.

Yoshi823:
A friend of mine had a 460 Yoshi when I first met him in 1978 when he was an apprentice at an engineering firm that I started working at when I left the Navy. I had a CB550F1 at the time & there were times when I struggled to keep ahead of him on the twisty bits. But then his bike was built by Dixon Racing, & when we had the head off to do the head gasket & lap in the valves we found that the ports on the head were sadly wanting. The were clean but not 'gas-flowed' in the correct sense. Even the part of the valve guide that protrudes into the ports wasn't modified or even made of a better material than standard. So it did look as though it was literally a 460c piston kit & a standard/modified cam, as there was only a slight differance between the base circle to the tip of the lobe from a standard cam that my friend also had. The Devil exhaust did make a differance to the sound though, but while we had the carbs off so as to get the head of, we checked the jetting, & this was on standard main jets together with the OEM air filter. Plenty of room for improvement there then, which we did when my friend's funds allowed him.

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