Question about Polaris ATV
Engine starts and idles fine. When I get to about 25-30 mph the engine boggs down,misses,sometimes backfires.When I remove air box and filter the engine runs fine with the carb. open and no restrictions. I have cleaned the carb. Replaced gas and gas line filter. Replace the cam shaft and exhaust rocker as the were worn.
Sounds like its running rich. check your float height and then lower your main jet needle a notch
Posted on Dec 10, 2017
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Posted on Jan 02, 2017
hi there it only starts to back fire when the engine is hot this points to incorect valve clearances os slightly damaged valve seats this is only oticable when the engine is hot due to heat expansion the clearancea would be an easy fix but to doo valve seats the cylinder head would have to be removed which is quite a big jo although i would try the valve clearances first unfortunatly i do not have the clearances but im sure i atv shop would tell you or if you have the manufacturers service repair manual it will te you in there hope this helps ben
Posted on Oct 12, 2009
SOURCE: dieing out
have 04 polaris predator 500 doing the same thing, when giving full throttle it seems to be hitting a limiter a couple of 1000 rpm below full rpm, but will only start with air box disconnected from carby and spitting gas out, might be buggered T.P.S unit have bought new Keihin Flat CR carby with T.P.S on it so to replace one on thumb throttle as it has taken some knocks ( should be able to test T.P.S with volt meter when pushing the throttle), a cdi unit and coil will see how that goes.
Posted on Sep 21, 2010
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