CB500/4 carburetors

[jj205mi]

well after having a think about it, i decided to do a compression test...



so between 85 and 110psi dry, a wet test seen them jump to 155 and 160psi, so thats a little worse, i guess its a rebuild on the top end.

Can anyone move this to the technical section?

[Bryanj]

Before you strip that down get it MOT'd and run it for a while as it could just be sticky rings that may well free off

[Trigger]

Bryan is right, get it nice and hot, give it a good trash as it will loosen the carbon from the rings.

[jj205mi]

it won't run well enough to take it anywhere lads, I've had it running a fair bit revving it out etc but still no joy. it can't hold an idle etc

[Trigger]

Not ticking over will be the carbs or points on these old girls most of the time.

[jj205mi]

The Honda manual says the compression to be 150-170psi, i thought the bike would be running poorly due to the lack of compression low down rpm. Damn points were before my time lol, i prefer electronic ignition and fuel injection all day.

ill have a look at the contacts, but i don't imagine it will run well with only half the compression it should have, you fellas will have more experience with these machines than me so as i said I'm open to suggestions.