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Garden Tractors Discussion Forum

Re: JD L120 garden tractorl Battery/starter issues 21HP Vtw

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Author  [Modern View]

05-01-2013 22:33:51

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Problem solved. I have forgot about those pesky decomp settings for the last time....

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joe csuti

05-02-2013 03:17:55

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 Re: JD L120 garden tractorl Battery/starter issues 21HP Vtw in reply to fastline, 05-01-2013 22:33:51  
If after checking/setting valve clearances and you still have a problem check out carb,you may have a sticking/leaking float valve in carb caused by dirt/gum & eng flooding when at rest,causeing piston(s)to hydrolock on inital compression stroke till excess gas blown out cyl(s)this is a somewhat common problem on many smaller ohv briggs eng.Smell oil on dipstick,if you smell gas in oil or have an overfull level then float valve leaking.

If tractor has a shutoff valve between tank/carb try closeing valve after each use,if no valve,add an inline valve & close after each use to see if that cures problem,might also try adding seafoam gas treatment to each tank of gas/gas container & run several tanks of gas thru eng to see if that helps/cures problem before removing/disassembling carb for inspection/cleaning

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