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1997 kx250 down on power

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Posting for a friend, so this is gonna be a bit vague. I apologize.

 

A friend just picked up a 97 kx250, the guy told him it was lacking power. My friend did a compression test and said that was good (i don't know what psi). He pulled the reeds out and they were cracked and chipped, would this alone cause a lack of power?

 

What else should he be looking for if new reeds doesn't fix it. He hasn't rode it yet, so i don't know where in the powerband it's lacking. I will post more info as i get it. Thanks.

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The reeds play a major role in compression and performance. That said, you've asked what else could cause the performance issue - I need to ask what has already been checked, maintenance wise?

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So i asked him what else he's checked. He isn't even touching the bike until next week. He's getting his grandpa's old 79 Elsinore 250 ready for a vintage race this weekend.
I'll update this later when we find out more. Thanks

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