2006 yz450f Piston Life

I have a 2006 yz450f with about 90 Hours. I change the oil every three hours and keep the air filter very clean. The bike runs great. I have only had to adjust the valves one time. And even then only one valve was barely out of spec.

THe bike starts first kick, usually, sometimes takes two or three. It uses no more oil now that it did was it was new. It still make great power.

Should I be thinking about replacing the piston anytime soon?

no just keep riding, my 07 has 94 hrs on it, never adjusted valves. still bang on the valve measurements i made at 10 hrs.

I have an 07 also that is up there on hours. It still pulls strong. I don't want anything to possibly fail due to fatigue so I'll be doing the top end soon.

I would definately think about changing it, even if the compression is still good the upper pin really takes a beating. Change the cam chain while you are there. That being said I guess a lot depends on how hard you ride the thing also.

I just rebuilt my whole motor (practically). My valves, piston, cylinder, and crank were all perfectly fine. However, I did have some crank bearings and "shift fork lever do-hoper thing" go out (or at least start too). I didn't even know that it was happenning either. My bike prolly had well over 100hrs (90%track) and started first kick every time and ran like a raped ape. Just good to take a look in there sometimes i guess :ride:

i have 0 track hrs and 100% bush, no races and i barley rev the bike over 6,000 rpm. i expect to do a re build about 150 hrs.

I just put a new top end in my 06, it has about 200 hrs on it and the rings were the only thing bad. Crack the head off and check what the piston looks like..... lots of carbon=remove and check ring gap and ring groove tolerance.

I have a 2006 yz450f with about 90 Hours. I change the oil every three hours and keep the air filter very clean. The bike runs great. I have only had to adjust the valves one time. And even then only one valve was barely out of spec.

THe bike starts first kick, usually, sometimes takes two or three. It uses no more oil now that it did was it was new. It still make great power.

Should I be thinking about replacing the piston anytime soon?

so many factors here on why you should and shouldn't.

many say on 4strokers that you needn't bother doing just the top end alone and you should do the bottem end as well.

then i have heard, that is hogwash and the bottem end is strong as all hell and there is no need.

i tend to lean in the favor of if it ain't broke don't fix it. but there is a hefty argument in the side of preventative maintinance.

also its how where and who you ride with.

i personally buy a bike every two years and ride it maintain it then sell it, don't mess with it unless something fails.

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