Dirt Bike Repair & Maintenance Forum

ok, i know i have to change my pilot jet since the pilot screw is almost out 3 turns so im going to put a smaller one in, now when im in there should i change my main jet aswell? its a #178 stock, would going with a #168 be better? my throttle response is horrible at low speeds, i live in Canada British Columbia, vancouver,  if that helps lol i got a 2006 Rmz250  thx alot, everything is stock on the bike  
2006 RM-Z250

Oh, and should i change the clip position on the needle??? or should i get a new needle??  
2006 RM-Z250

main 178
pilot 40
clip in 3rd
This is baseline jetting, but you will probably have to change due to elevation. What is your elevation?  
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Nobody's gonna hurt anybody. We're gonna be like little Fonzies here. And what's Fonzie like? Come on what's Fonzie like?

run the 42 pilot and the 168 main - that's common jetting correction for this bike.  
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Here we go again!

its 500m above sea level, where i live, thx skip, ill go pick those up today and try it out, should i still just run stock needle?? oh and should i keep the clip on the 3rd notch, thats the stock position.  
2006 RM-Z250

Stock needle is fine. Make sure to tune the fuel screw for peak RPM - it makes a BIG difference!

If you don't have an inductive clamp tachometer, just pick up an hour meter from the bike shop.  make sure it has a tach function.

Warm the bike up, and then set the RPM at 2200-2300 via the idle screw.  Now turn the fule screw in till it almost dies. Now turn it out 1/4 turn at a time until the RPM peaks.  You know you've gone 1/4 turn too far, when that 1/4 turn results in a drop (instead of a rise) in RPM.  
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Here we go again!

thx skipkh, thx alot lol,  the jets are coming in lol will take a week to get in damn local dealer lol should have these things in stock haha  
2006 RM-Z250