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Old 04-30-2015, 01:25 PM
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MASTERBATES MASTERBATES is offline
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Join Date: Dec 2012
Location: Southern Illinios
Posts: 154
Default 83 Suzuki Lt125 studdering Q&A

So im having a long and drawn out issue with an 83 suzuki LT125 4X6 ATV.
The issues have been going on for quite some time, with multiple attempted remidies it still hasnt resolved the issue. I will describe the best i can, and follow up with the actions i have taken.
Upon a cold start first pull fires right up. It idles about a 1/4-1/2 throttle. After a couple minuite warm up it will idle down and remain there.

Running down the road and at an idle, it makes a hollow(bub.bub bub bub.bub) sound. Like its a flat spot in the fuel circuit. Holding a steady speed down the road does the same thing... coming to a stop it slowly idles down, unless it is hot, (ex. Woods riding) then i wont idle and will die.
Yes. This atv is 32 yrs old, i know, but it was what i grew up riding. I can live with this ,but would be much happier with a smooth running machine.

Onto the attempted remidies....
I have replaced 3 carburators, jetting each time to what it likes best. Plug has a brown tint on the porcelin.
2 cams last one purchased new. Topend rebuild new gaskets piston,rings, timing chain.
Muliple checks on timing and compression (which checks out good, with no bleed off) lapped the valves also.

Any other suggestions? It does run from a fuel pump which is also new.
Leak tests around the carb assure me it is air tight
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MASTERBATES
TM 150 XRX-P&P head,A13cam,opened exhaust,140 main,38 pilot,adj cdi, perf coil,115mm variaitor,12 gm rollers,NCYpulley,2000 rpm springs,racing clutch,taller rear tires,and etc.
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