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Discussion Starter · #1 ·
i just rebuilt a 98 mach 1 it runs great but when it gets up to temp running for 20-30min it doesnt want to reach max rpms, it only revs to 7500 and starts to stutter not really bog. when i first start riding after letting the engine warm up it revs to 8500 and holds it, i can let the sled sit and cool down for 1-2 hrs and it runs great agian then starts acting up again after 20 min. all the proper breakin was observed, no air lock in cooling system cant find problem with carbs (recently rebuilt as well), changed the belt didnt change, new plugs, i am at a loss. can anyone help?
 
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