Whats the best way to break in a rebuilt motor?


7 replies to this topic
  • kjwarren

Posted September 22, 2009 - 02:31 PM

#1

Just got the top and bottom end rebuilt on my 02 426 whats the best way to break it in?

  • Beaz

Posted September 22, 2009 - 05:20 PM

#2

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

  • delmas

Posted September 22, 2009 - 05:22 PM

#3

Just got the top and bottom end rebuilt on my 02 426 whats the best way to break it in?


http://www.mototuneu..._in_secrets.htm

  • kjwarren

Posted September 22, 2009 - 07:34 PM

#4

http://www.mototuneu..._in_secrets.htm




Anyone use this technique?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • lluks252

Posted September 22, 2009 - 10:15 PM

#5

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.

  • mkporn

Posted September 23, 2009 - 07:53 AM

#6

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:

  • Wiz636

Posted September 23, 2009 - 08:44 AM

#7

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

  • kjwarren

Posted September 23, 2009 - 01:02 PM

#8

Thanks Guys





Related Content

Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo

First Hare scramble tips by dhend8


Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
Forums
Photo

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.