Equally low compression on all 4 cylinders

[Guest]

Ok you have your stock carbs. If you had c/v carbs you would have to remove the carbs to do a proper compression test instead of just holding the throttle wide open

[BigD_83]

Ok you have your stock carbs. If you had c/v carbs you would have to remove the carbs to do a proper compression test instead of just holding the throttle wide open

I'm not sure I follow you here. How do you figure that holding the butterflies open with the throttle does not constitute a proper test?

[Guest]

I'm not sure I follow you here. How do you figure that holding the butterflies open with the throttle does not constitute a proper test?

On c/v carbs even when you hold the throttle open all the way the slides will not lift if the bike is not running

[Brendan W]

I'm not sure I follow you here. How do you figure that holding the butterflies open with the throttle does not constitute a proper test?

When you twist open the VM carbs the slide comes fully up and the bore is wide open. Doing the same with CV the throttle plate/butterfly is open but the slide is not fully up, restricting the supply of air to the cylinder.

[blowerbike]

simple pimple....lol

[BigD_83]

True enough, but I'm not sure you aren't splitting hairs, though. If I'm not mistaken, the Suzuki service manual gives numbers for compression testing with the carbs on...

[Guest]

True enough, but I'm not sure you aren't splitting hairs, though. If I'm not mistaken, the Suzuki service manual gives numbers for compression testing with the carbs on...

what are the the compression numbers the manual calls for with the carbs on? It would have to be a low number. That is why I asked him if he had c/v carbs because some guys switch to the newer c/v carbs or the flat slide c/v carbs like on the Bandit 1200's
really not splitting hairs there is a big difference in cranking compression with carbs on as to off with c/v carbs