Author Topic: How do you know if you need new carb insulators/holders?  (Read 339 times)

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Offline denward17

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How do you know if you need new carb insulators/holders?
« on: September 30, 2022, 01:35:38 PM »
I am in process of cleaning bike and repairing  few items.

I was thinking of replacing my carb boots/insulators, but not sure if I need to.  I assume they are original to 1978.

They are pretty hard and hardly pliable, is that my clue?

Thanks

Offline Gary in NJ

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Re: How do you know if you need new carb insulators/holders?
« Reply #1 on: September 30, 2022, 04:56:25 PM »
That’s a first clue (although new isolators are hard too). I’ve had old ones that worked, but I used silicone spray to ensure that the carb bank was able to easily slide on. Visible cracks or flairing at the end is a good reason not to reuse. The tell tale sign is a hunting or high idle that can’t be reasonably reduced via the normal adjustments.
‘76 CB550F Super Sport
Also in the garage; ‘98 Ducati ST2, ‘05 Yamaha FZ6N, ‘81 CB900, LS650 based Cafe Racer, DRZ400 based Street Tracker
Currently restoring ‘81 Moto Guzzi V50 Monza

Offline seanbarney41

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Re: How do you know if you need new carb insulators/holders?
« Reply #2 on: September 30, 2022, 05:09:13 PM »
yeah, a lot of times nice new boots just make things so much easier.  Old hard ones can be made to work, but they require more care.  Good clamps are important too.
If it works good, it looks good...