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Discussion Starter #1
I have an 02 rancher 350 es 4x4 with a 2 inch lift with 25 inch tires. I know that that will zap some power. It has an fmf pipe and a k&n filter and I believe it has a jet kit stage 1. I bought it used and went through the entire thing it looks like a brand new top end in it. Carb was pretty nasty cleaned up really good. And adjusted to the best of my ability. My girlfriend has a completely stock sister to my rig and I can't keep up with her when she's at half throttle I'm pinned and her rig still pulls away. Mine takes forever to get up in rpm. And in 5th it barely accelerates. Any ideas. I never did a compression test. The plug looks good. Not when but a copper color. I'm kinda lost
 

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The easiest way to fix this might be a wheels & tires swap from your Rancher onto hers...that should slow her down a bit! LOL

Just kidding... I'd take a walk around the basic motor setup & tune. You didn't mention whether the airbox is still stock or not..? Is the carb OEM original? I'll assume both are so try this... first, adjust the valves to spec, then perform a compression test. If compression test is within specs after the valve adjustment is done, then I'd take the OEM carb apart and clean it again thoroughly in an overnight solvent soak and put it back together 100% stock by following the service manual recommendations. Adjust the cables like the service manual shows when you put the carb back on.

Having an aftermarket air filter and pipe doesn't change the needs of your Rancher motor much, if at all. So take your jetting kit out of the carb and start again 100% stock and work from that known-good baseline tune.

If its still a slug when you get done with the carb, check that your valve timing isn't off a tooth. You'll need to follow the service manual to get it set up right.

Let us know how it goes... enjoy your work!
 

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The easiest way to fix this might be a wheels & tires swap from your Rancher onto hers...that should slow her down a bit! LOL

Just kidding... I'd take a walk around the basic motor setup & tune. You didn't mention whether the airbox is still stock or not..? Is the carb OEM original? I'll assume both are so try this... first, adjust the valves to spec, then perform a compression test. If compression test is within specs after the valve adjustment is done, then I'd take the OEM carb apart and clean it again thoroughly in an overnight solvent soak and put it back together 100% stock by following the service manual recommendations. Adjust the cables like the service manual shows when you put the carb back on.

Having an aftermarket air filter and pipe doesn't change the needs of your Rancher motor much, if at all. So take your jetting kit out of the carb and start again 100% stock and work from that known-good baseline tune.

If its still a slug when you get done with the carb, check that your valve timing isn't off a tooth. You'll need to follow the service manual to get it set up right.

Let us know how it goes... enjoy your work!
^^^ That covers it all really ^^^
 

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Discussion Starter #5
Okay I haven't had a chance to get to work on it. I've gone through the brakes already all new. I had adjusted the valves to manufacture spec using the service manual as a guide. Just haven't done a compression check still. I will do that first and see if it is still within spec. And if it is I will go through the carb again and soak it really good. The air box is completely stock. The only mods I know off is a clutch kit the muffler and the air filter. I do not know for sure if it has a jet kit on it at all. I would have assumed with the muffler and air filter the previous owner did something to the carb. I will dig into it some more. Thank you for the replys.
 

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Discussion Starter #6
Okay so today I found the original owner of this quad. And found out all the things he's done to it. It has a highlighter .040 over kit bore kit. With sleave and rings. And has a jet kit for sure. And the motor is very ticky sounding compared to my girls. I am going to dig into it tomorrow and see what I can find
 
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