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Garden Tractors Discussion Forum

Re: 185 John Deere

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joe csuti

08-16-2013 17:43:36

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After checking for spark as JT said,if you have spark I suspect a problem in carb,black smoke is an indication of an extremely rich fuel mixture which can be caused by a sticking float,a float that's out of level or dirt in float needle seat & float valve leaking when eng running/at rest.

A sticking float,dirt in needle seat & dirt/water in carb bowl can cause eng to go lean/stop when running,if carb has a fuel shutoff sol on make sure connectors clean/tight & that you're not loseing power to sol either from a loose connector at sol or a problem in ign sw/tractor wiring

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joe csuti

08-17-2013 03:33:24

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 Re: 185 John Deere in reply to joe csuti, 08-16-2013 17:43:36  
Another thing you might want to consider doing if no problem with ign system(eng has spark)and before removing/checking carb if eng burning/hard on oil do a compression test or leakdown test on eng.

When you consider the fact eng 24 yrs old and an unknown number of operating hrs the simple fact may be eng needs a rebuild/replacement due to wear on internal parts.

If eng burning oil,black smoke/hard starting is normal on an eng with a large amount of internal wear(worn cyl/rings,worn valve guides,leaking head gasket)due to fact you have to almost flood eng to buildup enough compression for eng to fire/run,after eng gets hot & internal parts expand compression may be getting even lower & fuel mixture now too lean for eng to run/run correctly,you also have to consider wear in driven loads(drive train,mower deck)which add additional drag/load to an eng that's getting weak & cause eng to run hotter.

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