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01-08-2011, 10:20 AM
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Junior Member
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Member #10460
Join Date: Dec 2010
Location: Rochester, NY
Posts: 20
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trail boss 250 10mph max???
Ok i got my "pile" running and driving. but for some reason it only wants to do about 10 or so??? I have to assume this thing can do better than that. Anyone have any ideas about this?
Maybe some electrical thing? I have no idea
Its an 87 Trailboss 4x4.
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1987 Trail Boss 4x4 250
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01-08-2011, 10:28 AM
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Polaris ATV Junkie!
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Member #8052
Join Date: Oct 2010
Location: me
Posts: 1,104
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hmmm... gonna need some more info to go on than that i'm afraid. does it bog down when it gets to 10mph or does it sound like it's at max RPM? what's your sparkplug look like?
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01-08-2011, 10:31 AM
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Junior Member
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Member #10460
Join Date: Dec 2010
Location: Rochester, NY
Posts: 20
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it kinda bogs down from a little past idle and it seems maxs out at 10, almost like it flooding but i have good floats, and the carb is as clean as its gonna get. Spark plug is giving great spark when i ground it and pull it over. looks wet, not new but not toasted either. it doesnt seem like its getting to max rpm either
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1987 Trail Boss 4x4 250
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01-08-2011, 10:44 AM
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Junior Member
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Member #10460
Join Date: Dec 2010
Location: Rochester, NY
Posts: 20
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on a possibly related note, that idle adjustment screw out the right side( as if sitting on the wheeler) what is the recommended setting?
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1987 Trail Boss 4x4 250
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01-08-2011, 02:15 PM
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Junior Member
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Member #10460
Join Date: Dec 2010
Location: Rochester, NY
Posts: 20
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lets add hard starting to the mix. anyone?
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1987 Trail Boss 4x4 250
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01-08-2011, 03:01 PM
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Polaris ATV Junkie!
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Member #1234
Join Date: Aug 2009
Location: illinois
Posts: 1,166
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My book doesn't go back that far but it's usually 1 1/2 turns out ,realize that this is the starting point. Get it warmed up then adjust to the smoothest ,highest idle that you can achieve ,then back in a quarter turn. Do this with the air filter and housing installed, by the way is the air filter clean?
check fuel flow coming from tank
run a compression check (cold)
if the motor is in good shape mechanically,will rev up good in neutral, then you may want to look at the rear clutch
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