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Old 12-04-2018
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RMJay84 RMJay84 is offline
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Join Date: Feb 2006
Location: Australia
Posts: 4,952
Sounds a bit like what happened to my 525EXC when the stator died, although it started off subble at high revs, and gradually become less inclined to rev until it would not run at all.

It still had spark, it just had a very weak spark.

I had the original stator rewound for $75, problem solved.

If it doesn't solve your mate's drama, at least he'll know he's go a good stator.

Otherwise could it be fueling? getting lean when hot? (stab in the dark), some sensor not working? thematic-valve not opening causing motor to heat up too much?
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