I have a 2001 polaris scrambler 400with a motor bored .020 over with about 7 hours and the carb has been rebuilt but after riding for about one min it won't rev up very fast it will after a while but it takes a long time. It runs perfect once you take off. The mechanic said it is going to be a bit rich. And for instance I had it floored for about 5min and it wouldn't rev up or go over about 10 mph and it feels as if There's no bottom end power and it just feels weak my buddy on a Honda trx250 can drive circles around me

 

Have you checked the carb out,plus the clutches and belt from your last post on this?

 

I've checked both the belt and clutch I didn't hear any metallic noise from the secondary but the carb was cleaned before he put it on the rebuilt motor

 

What about the rear clutch ramp buttons? Plus a lot of people overlook crank seals when they just do top ends. If they leak,they could be the cause or part of your problems.

 

What are the clutch buttons I'm going to check th plug tomorrow it almost feels like it has a problem getting air flow or the oil is way to rich

 

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I haven't checked those I will tomorrow what do I need to look for on them

 

The clutch has to be taken apart! It's not that hard,but best to have manual that you can reference to or just unbolt it and take it to the dealer. On these I charged 1/2 hr labor to change out the ramp buttons,but you might ask first..plus here's a link to a pdf manual that can show you a few things. It's for two different machines,but have the same rear clutch. Index of /ORV Manuals/Polaris/Trail Blazer/2003

 

Ok thanks ill get back to you tomorrow

 

Swoosh there OPT, top end rebuild and no looky at the bottom, oh boy.....Could also have a bad/worn out spring on either clutch