1978 Suzuki TS125 Trouble Idling/sometimes starting

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TSstrapsters
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Real Name: Tristan
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My Motorcycle: 1978 Suzuki TS125

1978 Suzuki TS125 Trouble Idling/sometimes starting

#1 Unread post by TSstrapsters »

Hi. I have asked about this problem on multiple forums and haven't been able to figure it out. So my bike will usually cold start after 4 or 5 kicks, and seem to be running fine for about 5 to ten minutes. After it gets warmed up, it won't idle below around 2500 rpm without dying, and it starts idling faster and faster, and I can't get it to idle low again, even by turning the idle screw all the way down. If I shut off the engine after this starts happening, it seems like the bike is suddenly really hard to start again, like at east 8 kicks every time. Since this problem started, I have installed an inline fuel filter, cleaned the air filter,and did a light cleaning of the carb. The only other thing I can think of that people have suggested is to check for a vacuum leak. Anybody have any other suggestions? Also how do I go about checking for a vacuum leak? Thanks.

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Johnj
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Re: 1978 Suzuki TS125 Trouble Idling/sometimes starting

#2 Unread post by Johnj »

Hello Tristan and welcome to the forum. Try spraying starter fluid (CAUTION this stuff will flame on) in front of the carb, if the bike's rpms rise you got a vacuum leak. Which it sounds like to me. Or just replace the intake. Good luck.
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totalmotorcycle
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Re: 1978 Suzuki TS125 Trouble Idling/sometimes starting

#3 Unread post by totalmotorcycle »

Hi Tristan!

I'd definitely go with Johnj's recommendations. Can you post a photo of your carb boots (those are the rubber bits between the carb and the cylinder head)? If they are cracked at all (and if they are original, I'd bet a $1 they are), I'd replace them with NEW ones (if you can find them). You CAN temporary use a good quality silicone and go around them to help stop any air leaks, but really, they are most likely warn out.



Mike
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BRUMBEAR
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Re: 1978 Suzuki TS125 Trouble Idling/sometimes starting

#4 Unread post by BRUMBEAR »

yep I'll bet it's the boot cracked or bad oring heats up expands and viola air leak :D
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