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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Non Cold Start 1991 KDX250
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[QUOTE="dirt bike dave, post: 1408295, member: 18302"] If the bike used to cold start fine and has progressively gotten worse, it is my experience that the most likely culprits are bad reeds, or low compression due to worn out rings. Both of which are mentioned by julien_d. Any cracking or warping of the reeds can make a bike an absolute bear to cold start. It will usually warm start fine, though. Your bike can use a head gasket from an '88 KX250, which will give you more compression and low end power. Other years may work as well (89, 90, not sure about '91) but the '88 is what your motor is based on and it had a 'thin' gasket standard that year. Some years of the KX have an optional thin gasket, with a standard head gasket that is not much (if any) thinner than what you have. So if the dealer gives you a choice on thick or thin, get the thin one. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Non Cold Start 1991 KDX250
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