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I bought a 2001 rmk 550f for my wife (which I would never doo again!) only rev chassis for her from now on!

anyway, I know this isn't a doo question but I am stunned when it comes to most sled issues.

1st Q:> the sled has no snap at take off or through the bottom range and into the mid range( I know it's a 550 but feels sluggish-but not boggy)

2nd Q:> at wide open throttle it feels very rich (haven't looked at plugs)

3rd Q:> is this a simple matter of jet down (smaller number?) or both jet and needle.
 

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my son has a prox 550 fan . lots od snap to about 50 mph and then goes to about 70 mph.
clean the carbs. clean the secondary. and make sure the track is as loose as possible. these are some of the issues we found.where was the sled from? maybe its jetted to fat. also check the choke plungers.
 
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