Thats a huge relief. I normally change my air filter every 2 to 3 rides but I will start doing it every ride from now on for sure. I'am pretty content with the engine's performance other than some mild jetting issues giving me slow throttle response at low RPM. Someone told me it's because the carburetor is tuned to meet California Emissions so it runs super rich from the factory. Understandable, but a disappointment non the less. Any advise to help combat this sluggish throttle response? Also, what is the best fuel to run in the 250x? I've stuck to ethanol free 91 octane, thats the highest grade of fuel available in Southeast Idaho where I'am located.Welcome to the site !!
As long as you keep the oil clean , and don't bounce off the rev limiter , then you should be able to get several seasons off it , just keep check on the valves , if they start moving (getting tighter gaps) , then its time for a valve job , but that will not run you $1200 , if you are mechanically inclined , you can remove and replace the head yourself saving lots of labor costs , then all you need is the price of the valves , and someone to cut the seats (Ken can do that here) , unless your racing it , I would say go to Stainless Intakes , that way it will double or triple the life of the valves
On a side note , my 06 450X is on the original piston , rings , clutch , the only thing i have had to redo/replace , is the Intake Valves with Stainless , back in 06 , i have not had to adjust them since ... (your mileage may vary) , i did put a HotCams Stage 1 in it back in 06 , which makes it really work well for single track , as it almost eliminated stalling and its got torque for days now , i did re-valve the suspension and re-spring it for my weight and riding needs , i was thinking of putting in a new piston this winter , just because its been on the original one for 12 years , i mainly single track and desert ride it , if i want to rip around , i ride my 02 450R (pictured below) , its still competitive (in the 50+ Intermediate/B class) , and only mods to it is a 12.5-1 piston 2 seasons ago , along with Stainless Intakes and stiffer valve springs (and re-valved suspension as well which i do myself)
Basically , if you don't beat these things into the ground , they will last as long as any other brand , just keep the oil and especially the air filter clean and oiled , and you will be happy , dirt getting past the air filter , is a death sentence for valves , don't ask me how i know
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