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Everything Dirt Bike
Make / Model Specific
Honda
Honda 1986 XR250r
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<blockquote data-quote="cleonard" data-source="post: 213309" data-attributes="member: 21"><p>I must be a bad man. I've killed a few. It took a lot of miles to do it though. Measured in tens of thousands of miles, not tens of hours like some modern bikes. I put at least 50k miles on my 81 xr500 before it expired in the desert one day.</p><p></p><p>On my xr600's the relative lack of cooling was the bikes biggest problem. Running super tech trails where you never get out of first gear on a hot 100+ summer day was not good for it.</p><p></p><p>Had the plastic inside the tensioner fail as well as a couple of dropped valve seats due to excessive heat.</p><p></p><p>Ok back to the original question. Some back fires are not unusual. Honda even put a backfire screen inside the foam air filter on many xr models.</p><p></p><p>Make sure the foam is ok as I had one get torn on a backfie. Like was already said check the valve clearance. It's pretty easy.</p><p></p><p>Other than that look for air leaks.</p><p></p><p>Check for spark when it's cold and then after it quits. I had a couple of stators go bad. One of those failures happened only on a hot engine. When cold again it would start fine.</p></blockquote><p></p>
[QUOTE="cleonard, post: 213309, member: 21"] I must be a bad man. I've killed a few. It took a lot of miles to do it though. Measured in tens of thousands of miles, not tens of hours like some modern bikes. I put at least 50k miles on my 81 xr500 before it expired in the desert one day. On my xr600's the relative lack of cooling was the bikes biggest problem. Running super tech trails where you never get out of first gear on a hot 100+ summer day was not good for it. Had the plastic inside the tensioner fail as well as a couple of dropped valve seats due to excessive heat. Ok back to the original question. Some back fires are not unusual. Honda even put a backfire screen inside the foam air filter on many xr models. Make sure the foam is ok as I had one get torn on a backfie. Like was already said check the valve clearance. It's pretty easy. Other than that look for air leaks. Check for spark when it's cold and then after it quits. I had a couple of stators go bad. One of those failures happened only on a hot engine. When cold again it would start fine. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Honda
Honda 1986 XR250r
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