Question about 2003 Yamaha YZ 250
I have a two stroke atv 200 blaster i bought it with many aftermarket parts but it had very little power from idle to mid rpm. after trying many things i noticed it had a spacer between the carb and the reed valve. I took it off and gained alot of power back but still not perfect. It still had a stumble from idle to low rpm before it caught itself and then it ran good. I rejetted the carb from 230 stock to 340 and that helped the performance but still had slight hesitation. I also tried lower and upper the needle in the carb it just made it worse or no change. I then tried a stock reed valve and it got it real close to perfect but you still have to rev the motor a little to get the take off power then it runs great does anybody have solution please respond thanks
Try placing the reed spacer between .reed assembly & cylinder, also try an adjustable ignition stator plate, set at +4, k & n air filter, open air box.replace T.O.R.S. eliminator system w/ a cap & cable, and idle air screw install kit, also a pipe tuned for more torque(bottom -end/mid range) blasters dont have a lot of power on bottom end and the engine needs to rev to hit power band.cylinder porting,240 bigbore kits, & +4mm stroker crank assemblies are good performance options.
Posted on Feb 23, 2009
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