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Suzuki gs400 1978 - when at idle spits vac hose (Read 30 times)

GuiltyInnocence YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 1	Suzuki gs400 1978 - when at idle spits vac hose 03/31/24 at 01:22:09 After choke starts to come off and the idle gets normal then after a few seconds of sounding not very smooth it spits out the vacuum hose from the petcock to the carburetor. Does run a bit smoother when it does this
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 4997 Manteca , CA Gender:	Re: Suzuki gs400 1978 - when at idle spits vac hos Reply #1 - 03/31/24 at 07:17:28 I know zip about a GS but you have pressure where you should have vacuum. Burnt valve Bad valve adjustment Cam timing has moved Two cent
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Re: Suzuki gs400 1978 - when at idle spits vac hos
Reply #2 - 03/31/24 at 09:04:58

With so little information it is impossible for us to know exactly what is going on.

Is this bike new to you - or has it been running fine for a long while?
Has the bike been ridden and maintained regularly?
When was the last time the carbs were cleaned?
Do these bikes have a history of diaphragm failures in the petcock?

Can you remove and plug the vacuum line to the petcock and then turn the petcock to PRIME to allow fuel to flow?

Someday I will be old......But not today!

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