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Old 09-05-2010, 06:40 PM   #1 (permalink)
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Exclamation 98 450 foreman problem

450 foreman started blowing back thru carb. took the head off checking the valves. i had to drive the intake valve out it was the tight in the head. the exhaust slid rite out like normal. no marks on piston, nothing else damaged. does anybody know what causes this or is it just time to go out? it is 12 years old.
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Old 09-05-2010, 06:46 PM   #2 (permalink)
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Did the top of the engine look like it was getting plenty of oil, nothing else looked worn?
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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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Old 09-05-2010, 07:14 PM   #3 (permalink)
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evereything had oil on it just like normal. nothing unusual about it. its just seems like the valve swelled up too tight for the hole causing it to stick
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Old 09-05-2010, 07:24 PM   #4 (permalink)
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I don't know what would cause that. Did you try sliding the other valve down in the valve seat to see if it fit right and moved freely. If it does, I would just put a new valve in it and hope it doesn't do it again.

I've seen valves stick like that, but only if the engine has been sitting for a long time without starting it.
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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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Old 09-06-2010, 03:37 PM   #5 (permalink)
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yes the other valve slides good in it. guess im just gonna put a new valve kit in and try again.
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Old 09-11-2010, 09:05 AM   #6 (permalink)
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i put in new valves and springs problem still not fixed. it blows air out carb even harder. i thinking the timimg mite be off. wanted a second opinion before i start into it because it gonna b a good job to get to the timing chain
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Old 09-11-2010, 09:54 AM   #7 (permalink)
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if it's acting like my 2000 trx350tm rancher did..when i rebuilt it..and it's blowing gas back out the carb..then your timming is off..i just went through this very same thing..and yes..the timming chain and cam are a b__tch to get to !..unless you pull the motor...does the new valve slide in the valve guide in the head easy ?..if so..then yeah..you got a timming issue..your gonna have to pull the motor in order to get to the cam and timming chain..and you will need a special tool to remove the flywheel. when you get to your timming chain..and you re-align it..make sure you don't do what i did..and use the wrong timming mark on the cam sprocket !!!!..to make sure you got the right mark..after you think you got the right one..look on the lobe side of the cam sprocket..there should be a letter U on the very top of the cam..just make sure you get it facing up.
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Old 09-11-2010, 10:00 AM   #8 (permalink)
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i got flywheel and clutch pullers. the manual shows the 450 timing chain in front behind the clutches. sounds like it gonna be a fun afternoon
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Old 09-11-2010, 10:07 AM   #9 (permalink)
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Quote:
Originally Posted by jeffnott View Post
i got flywheel and clutch pullers. the manual shows the 450 timing chain in front behind the clutches. sounds like it gonna be a fun afternoon
that's odd..the timming chain on my 2000 rancher was in the back of the motor..where the pull starter is..did they move the timming chain on your bike to the front ?.
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Old 09-11-2010, 10:14 AM   #10 (permalink)
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its not the 350 rancher its 450 foreman. according to the book i got to pull both clutches to set timing and change the timing chain. its prob the original and stretched so it prob gonna need a new one
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