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Discussion Starter #1
i have a 98 foreman 450. just put new cam chain and cam chain lifhter assembly in. put back together adjusted the vaves and just took out for 5 mine its getting hot and the first 5 inches of exhaust is glowing red what can this be?
 

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Discussion Starter #3
no the original problem was cam chain lifter assm. broke causing chain to jump 90 degree out so bought new one and chain and installed them now running hot and exhaust glows at night never did this before have had since 2004 so know the machine very well thank you for helping in advance
 

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Discussion Starter #4
what would be the reason for having to replace cam ? also was thinking carb out of adjustment dont know factory specs for my region on virginia n.carolina border
 

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When i ride my grizzly at night the fisst part or the head pipe glow so red you would think it was on fire, my TRX450er did the same thing i was told i was normal the pipe is real thin and not to worry.
 

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Discussion Starter #6
more info on prob

no offense ive had this machine since 2004 it never glowed before we do alot of night riding in winter (me and my dad) because my work scheduale dosent let me get home till 730 pm also dont know factory specs for carb u know a reference point were to start to turn skrews out 1/4 turn set skrew idle stop ect. in nueteral it will start ideling hi on its own but if u leve in 1st gear it wont thank you in advance
 

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Check the rubber boot between the carb and the head could have a crack in it or be loose sucking air making it run lean, just a thought, those boots do crack with age.
 

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Discussion Starter #8
the reason were doing work ourselves is because of economy the closet atv dealer is 200 miles from home now they closed our shop and originally we took there droped off they rebuilt carb and did other routine stuff charged me alot and then called us and told us motor was shot all they could do was order us onother one and we picked up came here you guys and girls told us to check timing and sure enough a chain later and lifhter assembly (tensioner to normall people not to honda ) the motor is running again and very strong but still not perfect
 

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no offense ive had this machine since 2004 it never glowed before we do alot of night riding in winter (me and my dad) because my work scheduale dosent let me get home till 730 pm also dont know factory specs for carb u know a reference point were to start to turn skrews out 1/4 turn set skrew idle stop ect. in nueteral it will start ideling hi on its own but if u leve in 1st gear it wont thank you in advance
turn the air screw out from lightly seated to 1 1/2 and idle to around 1200 rpm
 

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Discussion Starter #10
checked boot looks new still

all my boots look good on carb also note we do not ride hard we dont go in water were sunday riders my dad has medical probs so he cant really ride hard we have these just so we can bond together oh also have a 2004 rancher 350 no probs with that one in 6 years we r very religious on maintence. thank you
 

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Discussion Starter #12
please dont get fustrared with me but i dont know of a air sckrew my manuall shows a pilot skrew throtle stop skrew and starting enrichment valvewould it one of those your speking of
 

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look in front of the carb bowl the air mixture screw goes straight up into the carb body where the bowl mounts to the carb body.
 

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Discussion Starter #14
ok adjusted pilot skrew se valve and throtle cables running great just need to make sure fan is coming on for oil cooling purpousis thank you quad racer you r very smart i will be able to ride with dad tonight . going after dinner so ill keep you informed of progress
 

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ok adjusted pilot skrew se valve and throtle cables running great just need to make sure fan is coming on for oil cooling purpousis thank you quad racer you r very smart i will be able to ride with dad tonight . going after dinner so ill keep you informed of progress
glad i could help brother!
 

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I know you didnt replace the cam but you are positive you have everything properly alligned? Also one thing that will cause a head pipe to glow is backpressure you may want to remove your pipe and make sure you don't have any obstrucions anywhere in the exhaust system, especially the muffler.
Where do you live? I live on the NC / VA Border as well.
 

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Your machines may be running a bit on the rich side if you have never seen glowing on the pipe. It is a normal thing to see the very beginning of the head pipe glow at night. I have used that glowing pipe and toilet paper to start a camp fire. If you see it during the day... now that's another issue.
 

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I would say JUMP would be a good option if you see it in the daylight! LOL



Your machines may be running a bit on the rich side if you have never seen glowing on the pipe. It is a normal thing to see the very beginning of the head pipe glow at night. I have used that glowing pipe and toilet paper to start a camp fire. If you see it during the day... now that's another issue.
 
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