TT1 4 Hour Endurance racing

Hi Andy. Can you find some hose with a braided inter-layer that will do the job? Massively tougher than just rubber alone.

delme hose.jpg

Al the best with the rebuild chap. Paul.
 
Haggis said:
Hi Andy. Can you find some hose with a braided inter-layer that will do the job? Massively tougher than just rubber alone.

View attachment 91299

Al the best with the rebuild chap. Paul.
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Would be difficult to get the profile for the inlet and carb stubs - otherwise you'd have a dirty great 'gap' in the inlet tract. Maybe a smaller ID/oD insert could be rigged up from the same or other material.

Used to service about 4 Kwaka Zs a day in the mid-late 70s. We'd often replace the crazed inlet rubbers 9which are the saem stuff as fitted to most of the Mik/FCR conversions.
 
Vince said:
I use a Guzzi rubber inlet manifold on my 3c with Mikuni carbs, They make one to fit 32mm carbs and one for 36- 40mm carbs, I use the latter. Nice thick solid rubber with preformed grooves for hose clamps.
motociclo.com.au

Carb inlet manifold, 40mm. Moto Guzzi. – Motociclo

motociclo.com.au motociclo.com.au
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So not std Mikuni, Vince? They do look robust. I use one of that type plus one with the two-stud flange onto the head. Rogue air in the intake port scares me after melting a piston!
 
I have melted approx 5mm off the edge of a couple of pistons, and a 12mm hole in the middle of a piston but bloody hell that's impressive. That looks like it completely exploded the piston, shock waves from Detonation>
 
I found one like that in an ex Bol d'Or endurance racer.
Somebody had rebuilt the engine top end with new pistons, only one of the centre mains was gone and the bits of piston were in the bottom of the crankcase.
Paul
 
The two lumps at the top are what I was expecting. First time I saw a piston gone that far was a speedway Yamaha 650 twin.One piston was a neatly rolled ball sitting on top of the crank. Beaten/rolled and folded by the rod. Someone remarked at the time that it looked like it had been in a dough mixer.
I've seen it twice since where gudgeon pins have pulled through the bosses. But only with forged pistons. Cast seem to break up readily.
 
Yikes, that's a seriously impressive addition to the 'offerings to the god of speed' shelf. Sorry to see it, must have been a painful end to a great weekend. Thanks for sharing the journey with us, a problem shared is a problem halved or whatever they say...
 
KERMIT1200 said:
Engine back in frame after new barrels, different crank, two new liners, 3 pistons. Well on schedule for Donney 5th October. What could possibly go wrong now!!!!!!!!!!!!
Andy
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As long as you found a reason for the disintegration and it's been rectified!! Good job to have it all back in one piece ... big job!
 
KERMIT1200 said:
Well Haggis I bought her a new set clothes and promised her a slap up meal if she behaves!
Andy
She wants for nothing - new 520 drive chain and new primary and tyres and oil every race etc
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Fab! I'll keep my fingers crossed for ace weather, esp so you can give those tyres a good torturing - and get a massive smile on your face. You are certainly due a break from spanner-time.
 
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