Maintenance & Technical > KX250 / KX125

More Bottom End '05 KX250

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Kawabunga:
I recently purchased an 05 KX250. The bike has a few mods from stock including VForce 3 Reeds, Pro Circuit Works pipe. It also has a new Vertex piston/rings ect...

Its the first KX I've owned in many, many years. I'm coming off an 00 RM 250 I set up for woods riding. Mainly single track in the mountains of WV. I lowered the gearing and added a flywheel weight to tame the hit of the RM.

I have very liitle time on the KX but already see I need more low end grunt. I need more lugging power. If this bike falls off the pipe its over. It simply will not lug down and come back from it without a handful of clutch. Then the monster hit comes on in the mid range, the rear wheel breaks loose and its over. (It feels more like an extremely hyper 125 than a 250.)

Could this be a mechanical problem, power valve/carb or is it the nature of the beast?

I like everything else about the bike and would like to keep it. Its in excellent shape and I like the suspension/handling of the bike. It turns great and feels stable at any speed.

Has anyone added a flywheel weight and a FMF Gnarly to an 05? I'm hoping these changes with lower gearing will get more out of the bottom of this bike. I hate to spend the money and still not be satisfied though.

Any advise or direction would be appreciated.

The Flyin Hawaiian:
I have heard that this is the nature of the new style engines. My 04 is smooth and torquey. My girlfriend, who also rides a 04 250 and competes in enduros, just picked up a 07 and we were a little concerned about the type of power it puts out. Its still in the protective plastic wrap, fresh out of the crate so we havent ridden it yet. The Gnarly worked well on my 03 KX, which I thought was lacking in the lowend dept., also the V Force and fww along with 13/52 gearing helped. The FMF Q or the Pro Circuit 296 helps smooth the low to mid transition, I prefer the 296 because of durability issues with the Q.

Jeeks:
You need a stock pipe on that,  3rd gear berms all day.

makKX250:
I dropped to a 12 tooth counter sproket and added an 11oz FWW. It helped with it's lugging ability and really helped tame it down in the mud/ice/snow/rocks and other muck we have here in the rain forest they call the PNW. The VForce 3 on my YZ125 really helped with the low end throttle response so that is going to be my next mod. Then if that doesn't do it I'll look into a Gnarly pipe. Funny, I stall in the really tight stuff on the 250 probably five times as much as I do on my 125 which doesn't stand to reason since I weigh 210 lbs.

Dutch-K5 Fan:
Ad a spacer to the VForce 3 Reeds, and a 10 or 15 mm long pipe between the cilinder and exhaustpipe.
Longer frontpipe gives more bottom end.

 Dutchie

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