Carb Rubber leak symptoms

Curvy 2000 s

This is a sanity check essentially.

Having had the bike in for numerous things including fixing a vacuum leak - erratic idle - revs rose after spraying carb cleaner near inlet rubbers.

It's come back with the same problem. Now I truly do think the garage I used was utter sh1te. They handed it back to me with a dead front lug and a flat battery yet insisted they had tested it . . ..uh huh

So I've bought the rubbers and I'm doing it myself. Before I get stuck in I just want to check that there are no other problems that could manifest the same way.

I'm aware of the choke plunger issue but with the revs climbing after a squirt of the cleaner I'd say it was still dead cert that the carbs are leaky. Any other culprits other than the rubber being perished?

[johnnyrod]

The mounting bolts can be REALLY hard to shift so you may have to work up a bit more room to work. Also the O rings on these things don't always seal well so a little gasket compound on them helps.

Have you checked the diaphragms for holes?

[yorkie_chris]

Nothing as simple as a split vacuum cap or loose carb clamp?

They charged me for o rings so they better have new ones.

Will chekc the diaphrams - my problem isn't lack of tools and willingness - it's lack of time and this is the girlfriend's bike so wanted it done fast -

The old if you want a job done properly . . .. ..

[yorkie_chris]

Doesn't sound like diaphragms to me, that gives a really slow rev

Just done a search for the vacuum caps - no idea where to get em. In case they're the culprit any idea where I get some?

[yorkie_chris]

Don't bother just use a bit of fuel pipe with a bolt in the end

[johnnyrod]

I'd use a bit of sticky stuff even with new O rings. As Chris says, the caps aren't rocket science, even a bit of PVC tape would serve to block one off for a while if you had to. There are various tubes dangling off the airbox too. Have you balanced the carbs?

[yorkie_chris]

If it's picking up speed when squirted then there is obviously a leak.

[maviczap]

Originally Posted by yorkie_chris

Nothing as simple as a split vacuum cap or loose carb clamp?

I was just thinking the same, mine fell apart when I fitted Bib's vacuum pipe hoses.