SOHC.co.uk Forums > CB750
Carb rubbers
AshimotoK0:
Whoops doesn't sound good. I will do some tests on the one I softened in 2010 and report back but sounds like it may be a no no from what you are telling me. If you are having probs this early after fitting them it's going to be false economy in the long run. Did the clamps go slack at all?
Ash
royhall:
Cheers Ash.
Have fitted the clamps with cap head screws so I can get a better purchase on them with a long t-bar key. Think they have tightened up okay, but its hard to tell for sure.
Just retested my other F2 that has new pattern part rubbers from Vintage CB750 in the states (at huge cost) and that's leaking as well. So I guess I wont be going down that route again. These rubbers are slowly turning into a bit of a nightmare.
Going to stick with the originals for now, may try a bit of Hondabond. Cant make matters any worse at this point.
Cheers, Roy.
AshimotoK0:
Give me a bit of time to do some experiments Roy. I will clamp one like yours to a K7 carb body, pressurize it and put a pressure Tx in line and plot the pressure decay plus spray the lot will leak detector.
Anyone know what the DS pattern K0 ones are like or the Cruzinimage ones . Or are they the same?
Ash
Sparrow1:
I had huge issues with my K0 carbs regarding air leaks on all four. I could balance all 4 for 10 mins and then they go all pear shaped again. I then ordered 4 new K0 rubbers from Silver and I have never looked back, not withstanding the fact the earlier the 750 carb the less likely it will stay balanced. Even out of balance the bike performs fine, just isn't as sweet. Round about 500 - 1000 miles to stay in balance. I spoke to my chap who does this for me and remembers working on the K0/1/2 carbs back in '69 and on and keeping them in balance after sale new was a nightmare! My carbs are from Mr 750 Carb and completely overhauled hanging part exchanged them. Even then they needed balancing. The 4 way splitter is a pain too, a poor design and Honda quickly changed improved/changed the system. I am envious of the K1 set up, a much better system but, heh, that's first 'edition' bikes for you!
Forgive me if I am out of order and missed the point but I would buy new rubbers if I were you.😉
Nige. Ps, and good luck.
UK Pete:
i wonder if hi melting point grease would help seal them ?
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