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kjwarren

Whats the best way to break in a rebuilt motor?

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Ive always taken it easy for about 5 minutes let it cool checked nuts and bolts then rode it at my normal pace

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My friend and I put a new wiseco piston on my '05 yz450f. All I did to break it in was, go riding for like 10-15 min 1/2 throttle. Let it cool down completely, check bolts like you said. Then, ride it for around 30-45 min 3/4 throttle. Let it cool down again. Then I went out and rode like normal.

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My friend and I put a new wiseco piston on my '05 yz450f. All I did to break it in was, go riding for like 10-15 min 1/2 throttle. Let it cool down completely, check bolts like you said. Then, ride it for around 30-45 min 3/4 throttle. Let it cool down again. Then I went out and rode like normal.

The way I break in every motor I do for someone i do the same way and have never had issue.....I tend to put it thru 3 heat cycles....

Put it together, start it up and let it idle and come to a good operating temp (hot to the touch on the head....Shut it down and put a wrench on everything to make sure everything is tight. Check fluid levels. Let it cool off.

Start it back up and come to temp...ride it around a couple minutes (no full throttle) 5-10 minutes of varing speed and throttle (do not hold at one speed or rpm for very long). Shut it off and cool, put a wrench on everything again (double check just for the heck of it and it gives you something to do while waiting for it to cool) check the fluid.

Now for the last step.....Ride it like you stole it.....:busted:

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I fire it up and take it easy for just a couple minutes to make sure everything is working...then it's hammer time.

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