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Is my DR 350 running too lean?

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It does backfire if i let go of the throttle in high rpms but i dont know if thats normal. But i heard that running lean can mess up your engine and over heat it. So heres a picture of my spark plug after 10 mins of idle. And if it is too lean, do you turn the screw up or down to rich the mixture? And can running too rich cause excessive carbon build up? I just want my engine too last as long as it canImageUploadedByThumper Talk1408398765.896676.jpgImageUploadedByThumper Talk1408398779.030807.jpg and am not too familiar with fuel/air mixture settings

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looks pretty good.

i'd never let an air-cooled motor idle for 10 minutes.

backfires can also be caused by exhaust leaks.

is it backfiring or just popping?

good indicators of too-lean running:

performance suffering

motor running too hot

try this: after riding when you think its too lean, shut off motor & check the oil.

if the dipstick is too hot to handle with bare fingers, it could be a too lean.

the procedure for setting the mixture:

motor running & fully warmed up from riding

turn the mixture out [ccw] slowly, 1/8 or 1/4 turn until the rpms are maxed

then turn back in slowly until the rpms begin to drop. back out just enough to speed up again.

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looks pretty good.

i'd never let an air-cooled motor idle for 10 minutes.

backfires can also be caused by exhaust leaks.

is it backfiring or just popping?

good indicators of too-lean running:

performance suffering

motor running too hot

try this: after riding when you think its too lean, shut off motor & check the oil.

if the dipstick is too hot to handle with bare fingers, it could be a too lean.

the procedure for setting the mixture:

motor running & fully warmed up from riding

turn the mixture out [ccw] slowly, 1/8 or 1/4 turn until the rpms are maxed

then turn back in slowly until the rpms begin to drop. back out just enough to speed up again.

Its just popping on deaceleration from high rmps but that could be normal. And i have tried adjusting the mixture screw with the engine running but nothing happens to the rpms and it doesnt seem to change anything. And the dipstick is hot but i dont need gloves to take it off

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