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Discussion Starter · #1 ·
My 01 foreman 450 ES is bogging down/stuttering (and sometimes afterfires) in 1st and 2nd from a standstill (idle) to WOT. But the problem can not be duplicated in nuetral. There is no problem when i advance the throttle slowly. The problem started about a month ago and since then i have been tinkering, but with no results. The air filter is clean, carb is clean, and new spark plug. I have not checked the fuel lines or fuel filter or pump. I have played with the idle screw and at a higher rpm it seems to fix the problem but then the rpm is to high to get it to downshift. The foreman is stock except for a K&N air filter and mud lites. Originally i thought it was bad gas (water) but since then i have put two tanks through. I don't know what the culprit is and what to check next.
 

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Discussion Starter · #2 ·
UPDATE: i just checked the spark plug and it is running lean. Im back to thinking it is fuel related.
 

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I have not checked the fuel lines or fuel filter or pump.
The 450 Foreman doesn't have a fuel pump. Check to make sure gas is flowing good from the hose that goes to the carb. If it is, then I would take the carb off and clean it good.

You aren't having any problems with the electric shift, are you?
 

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Discussion Starter · #4 ·
Ok thanks im guessing the needle jet is the culprit, either its varnished or has a partial blockage. At least the problem is narrowed down
 

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Also, check the rubber vacuum piston in the top of the carb to make sure it doesn't have any holes or leaks. The vacuum piston is the part that raises the needle up in down. Also make sure the needle didn't come loose from the vacuum piston.
 
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