Hi. New here but have been visiting for a while.
I have a 2010 sportsman 500 ho carb.
The problem I am having is that above 4000 rpm the bike starts bucking up and down, not backfiring but seems like it runs ok then doesn’t. The more throttle I give it the worse it gets To the point of no power at all. From start up to 4000 rpm you wouldn’t know there is anything wrong as long as I don’t go to full throttle . When I pulled the spark plug it was black carbon coated, not thick, just black.
So far I have changed the plug, new air filter and fuel filter and no change. It does not make any difference if I pull the choke when it is acting up. Any thoughts would be great.
Thanks
Mike
I have a 2010 sportsman 500 ho carb.
The problem I am having is that above 4000 rpm the bike starts bucking up and down, not backfiring but seems like it runs ok then doesn’t. The more throttle I give it the worse it gets To the point of no power at all. From start up to 4000 rpm you wouldn’t know there is anything wrong as long as I don’t go to full throttle . When I pulled the spark plug it was black carbon coated, not thick, just black.
So far I have changed the plug, new air filter and fuel filter and no change. It does not make any difference if I pull the choke when it is acting up. Any thoughts would be great.
Thanks
Mike
