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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Is this normal ????
Post Info TOPIC: Is this normal ????
domski1


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Is this normal ????
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Ok just a little curious , my ttr is all standard but it pops / back fires when you rev it up and on over run when riding it, it is worse on the choke but still does it when warned up. ? I am sure a read somewhere it may be due to incorrect fueling? The bike is perfectly rideable and it doesnt bother be whatsoever but I don't want it to cause any damage if it's running lean for instance?

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TTRfan


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Air leak? Jubilee clip loose or rubber parting from the metal stub on the inlet manifold?



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domski1


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Ahh, I will have a check round tomorrow, thanks for that Brian.

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Aidan


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i have an after market muffler and mine is the same. possibly running rich??

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TTRfan


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Popping and backfiring is usually indicative of an air leak on the intake side and therefore giving a weak mixture.

Backfiring can also be caused by a leak on the exhaust side although not quite so common.



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domski1


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Well I have checked the clips and the rubber hose and no signs of a leak, I even sprayed some brake cleaner around to see of a small air leak would suck it in but nothing. Maybe should check mixture setting screw on carb?

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