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I am working on a 2008 Teryx 750. My friend said it would only go approx., 30 mph, and it only has 100 hrs on it. I test rode it and sure enough,,,,, 30 mph! I have checked the valve clearance, cleaned the carbs, sync'ed and adjusted idle mixture, removed the exhaust, checked the air filter and fuel filter, fuel vent, vacuum lines.... I checked to make sure the vacuum pistons in both carbs are functioning properly and I even checked to make sure the pedal/ throttle cable is opening the butterfly's fully. I do not have a tachometer to check top RPM in neutral but I have held the throttle wide open and the engine rev's to a fairly high rpm and runs smooth when held at full throttle. Shouldn't they have a rev limiter??? I would assume if held wide open they should reach high RPM and cut out or miss and NOT run smoothly... Any help on this machine would be greatly appreciated!!!! Just about at my wits end.......
 

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Check the belt deflection, sounds like a way worn out belt or dirty clutches.
 
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