Question about 2003 Yamaha YZ 250 F

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What aboute the exhaust get realy red and orange on the exit of the celinder

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  • Anonymous Mar 06, 2009

    how do you richen fuel on yz250f carb?


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If this is noticeable in the daylight, your fuel mixture is probably running very lean (not enough fuel) and you should not run the bike until you find out why (carburetor issue possibly). If you only notice this at night, a dull orange glow is not unusual, if it is bright red or goes very far down the pipe your mixture is probably lean.

If you continue to run the bike in a lean condition you will likely damage the engine severely, blowing the headgasket or burning the valves.

Posted on Feb 27, 2009

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Yz250f exhaust pipe glowing red straight away

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Engine stops when throttle opened also exhaust glows red at manifold

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Check the carbie jets are not blocked, air filter clean, exhaust not blocked and valves are in specified clearance.
At night the manifold will glow red, this is normal.
You just can't see it during the day.

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I just recently installed an fmf powercore 4 muffler on to the stock heaader of my 08 crf 150rb and i turned it on to see how it sounds and after haveing let it idle for a couple minutes i noticed that the...

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you can get them re-cromed but its costly why not just paint them black with heat proof engine paing
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1 Answer

Exhaust gets red

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Feb 28, 2009 | 2003 Yamaha YZ 250 F

1 Answer

Exhaust comes realy orange

there is a excess build up of oil in the exhaust, remove the exhaust and pour some petrol inside the exhaust and light it, leave it for around 30 mins to let it burn away the oil. Be VERY careful when lighting as sometimes you get a little flame puff out of bith ends.
please rate this advice.

Feb 27, 2009 | 2003 Yamaha YZ 250 F

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