Maintenance & Technical > KX500 Original

Reducing Power - I'm a wuss!!!

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KXcam22:
Toml,
  When my bike had the stock jetting the power was difficult.  It would burble low to mid then take off like a scalded cat on top. Was a bit unsettling since I am accustomed to using the midrange edge and there was none.  A few changes turned this around completely.  Careful jetting (the jetting chart is almost perfect) reeds (I'm using the boysen dual stage - I like them but the V force is better) and a reed spacer.  Now the power is electric-linear with a nice midrange blast.  I ride tight single-track and woods.  The power is easily controlled with the throttle, no need for a flywheel weight.  As Timbowe says "smoothness is the key". Hope this helps. Cam.

mikesmith:
Well as far as making the carb smaller its not as easy as using a washer,but I know there used to be a place that would bore your carb and you would use sleeves for a bigger or smaller venturie.But I think Id try more praticle things first.I have a Pro Circuit pipe( so if Im wrong some one help me out)but I would suggest a FMF gnarly pipe.Destry Abbott likes a smooth power band and runs this pipe.Theres an optional thick base gasket (and I think a head gasket)for a lower compression,the base gasket will alter port timing,and Ive never run it ,but I hear it smoothes out the power,or send the head to Pro Circuit and the can machine it for you..As some one suggested try playing with your gearing(smaller rear or larger front).

Timbowe:
I,ve seen a exhaust port washer/ring type thing that is used on the KDX. Lowers top end broadens low to mid range. I run a Gnarly on My kdx. and I really like like it! Good smoth delivery of the bottom and dose'nt really sacrifice to much top end. Plus It is made out of a heavier guauge metal. Withstands a lot of punishment! Gnarly is on my ever increasing list of up grades for the big 5. When I went to check out my 5, the dude selling it had given it a spruce up and siliconed it all with spray on amour all stuff [including the seat]. Jumped on, fired it up, took it for a quiet burn to warm up. Once warm gave it a tap and nearly shot straight of the back of the seat!  Gripper seat cover was the first modification.  What a difference! Seated control is far better. Although a set of raised bars and standing is my preferred method.

gowen:
Shrinking the exhaust? Covering up the airbox? Changing the gearing? Using a washer on the Carb?

What I'm hearing/reading is, it sounds like, a 500cc two-stroke is not for you. If you like bigbore power at less-a-hit, try the XR series bikes. If you are just a two-stroke guy, try a 250. But, I have to say, my KX250 hits harder than my 500 (well it is felt more, due to traction). I'd just suggest looking for another bike. You can't reduce ""POWER"" persay, but you can change the power. Anything you do to reduce power will damage the engine in some way. The BIG BORE has to breath, you can't restrict the air without hurting it. It will lead to issues with your block. Read the issues already about vaccum to the KX and the surging.

I'll leave this post alone, but I will say, don't buy anything you can't handle. If you have to reduce the power on a bike you own and can't just control yourself or the throttle, get rid of it and start smaller, then once you feel more comfortable on what you chose, move up to the next size.

jdv500:
yeah,
 i agree with gowen, don't mess with anything on the bike  for de-modding it, if your not seeking more from your eng/bike combo, but trying to simmmer it down then sell it to get something smaller. your 500, in it's basic raw form is a monster. either buckle up and get to know the bike through a variety of terrain or just let it go, save your self the pain and heart-ache. you don't want to ruin your (off-road passion) altogether by forcing yourself to go bull riding.!!!!! enjoy, jdv

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