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05-02-2010, 08:20 AM
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#1 (permalink)
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Junior Member
Member #3020
Join Date: May 2010
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Foreman 450 ES only run on choke
I have an 02 Foreman 450 ES that has been sitting for a couple years. When parked it, it was running rough. It would idle rough and miss once in a while. Sometimes causing it to stall. Upon acceleration, it would miss and sometimes "backfire" through the carb.
I have removed the carb and blowed all the jets and orfices out like the service manual tells. I also readjusted the valve clearance. They were about .010. I reset them to .006 as manual states. I have also flushed the gas tank out and put fresh gas back in.
This thing is driving me crazy! Now I'm not an atv "mechanic" to speak of, but I do know what I'm doing. Does anyone have any ideas? Could this be an electrical isssue? In the past, I did have a few wires chewed on by mice. I fixed them all, unless I have missed something.
I can get it to run only with choke on but it runs rough and will not accelerate.
Thanks!
Last edited by Merlin; 05-02-2010 at 08:24 AM.
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05-02-2010, 08:33 AM
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#2 (permalink)
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Super Moderator
Member #417
Join Date: Jun 2009
Location: East coast North Carolina
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If it will only run with the choke partailly on then I have to say you have a clogged idle circuit. I know yoou blew out the jets and orfices but did you remove the jets? Did you use carb cleaner before? I would suggest that you remove the carb again, remove both jets and the pilot screw and any O-ring as carb cleaner will destroy them. you also could have a small crack or tear in the accelerator pump diaphram piston. Also you may have a bad carb heater. Some of the utility guys have more experience with these carbs, they should be along shortly.
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05-02-2010, 11:21 AM
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#3 (permalink)
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Senior Member
Member #1660
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Location: Central City, Ky.
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I would also say that the carb. Still has a little trash still in it somewhere. Also the timing could be off a little.
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05-02-2010, 09:31 PM
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#4 (permalink)
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Super Moderator
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
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yep..i agree..carb jets are stopped up..go back through it..and pull the jets..clean them out with a wire from a wire brush..nothing bigger !.
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05-02-2010, 09:40 PM
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#5 (permalink)
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Senior Member
Member #897
Join Date: Oct 2009
Location: jasper texas
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yeah i agree carb issue
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05-02-2010, 11:03 PM
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#6 (permalink)
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Super Moderator
Member #948
Join Date: Oct 2009
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Posts: 23,815
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Yeah, I agree. It sounds like the carb still has some debris in it somewhere. Also, make sure you check the rubber vacuum piston in the top of the carb. It could have a hole in it and that would cause it not to want to accelerate, because it wouldn't raise the needle.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!
You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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05-08-2010, 10:44 AM
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#7 (permalink)
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Junior Member
Member #3020
Join Date: May 2010
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Thanks for the help. It actually was the idle jet plugged up. Initially I just blew everthing out, but then went back and took all jets out and looked through them. The idle jet was clogged almost completely shut. I cleaned it out with a torch tip cleaner. Now it runs much better. Thanks again for the assistance.
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05-08-2010, 10:55 AM
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#8 (permalink)
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Super Moderator
Member #126
Join Date: Feb 2009
Location: Kentucky
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Glad to hear you got it fixed!!! Welcome to the Family!
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05-08-2010, 11:39 AM
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#9 (permalink)
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Super Moderator
Member #948
Join Date: Oct 2009
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Posts: 23,815
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Yeah, glad you got it fixed.
__________________
Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!
You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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