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Everything Dirt Bike
Make / Model Specific
Yamaha
ttr90. ignition
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<blockquote data-quote="Trfsrfr" data-source="post: 211887" data-attributes="member: 3959"><p>When I got my kids CR80 I was fairly sure there was no spark. It was recommended to clean/sand the coil ground/mounting bolt surfaces, and after I did that I had spark and it runs. Not sure if it really didn't have spark or if maybe I was out in too bright of sunlight to see a spark when I bought it, but after sanding down the mounting points it had spark and I knew I could eliminate that. So definitely eliminate that out of the equation, and all other possible problem areas.</p><p></p><p>All 4 strokes need 4 things to run; Compression, a combustible fuel mixture, spark, and ignition timing.</p><p></p><p>Probably wouldn't hurt to clean your carb again.</p></blockquote><p></p>
[QUOTE="Trfsrfr, post: 211887, member: 3959"] When I got my kids CR80 I was fairly sure there was no spark. It was recommended to clean/sand the coil ground/mounting bolt surfaces, and after I did that I had spark and it runs. Not sure if it really didn't have spark or if maybe I was out in too bright of sunlight to see a spark when I bought it, but after sanding down the mounting points it had spark and I knew I could eliminate that. So definitely eliminate that out of the equation, and all other possible problem areas. All 4 strokes need 4 things to run; Compression, a combustible fuel mixture, spark, and ignition timing. Probably wouldn't hurt to clean your carb again. [/QUOTE]
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Everything Dirt Bike
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Yamaha
ttr90. ignition
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