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XR100R Backfiring

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My son's bike backfires on deceleration quite regularly. Not quite sure what to do to fix ti.

Cleaned the air filter (it was pretty dirty) and it didn't change anything. Checked the plug and it's a nice light brown color.

Any suggestions?

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Is it actually backfiring or is it popping from the exhaust? Start by adjusting the air screw.

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check to see if the exhaust pipe is leaking where it bolts to the head.

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Is it actually backfiring or is it popping from the exhaust? Start by adjusting the air screw.

Please describe the difference.

Thanx!

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check to see if the exhaust pipe is leaking where it bolts to the head.

Good suggestion...I will try that.

Thanx!

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