Topic: Break in

[Bousolle]

Hi
I whant  to  know ,  I change my piston rings, and my valves  so, are  I need to break  in ?

[Jerry Rxman Griffin aka MuthaF'er]

Yes, you need to seat the rings at least. Just be sure nothing breaks initially.

[Phoenix]

Ride it like you stole.  Doing it now. 

[Bousolle]

What  you mean ?

[SOHC4 Cafe Racer Fan]

I think he means you should ride it like you plan to ride it.  The rings need to seat, so you need to put it through its rev range and under some moderate load.  Don't pussyfoot about and keep it under X,000 RPM until 200 miles, etc.

Do change the oil after about 500 miles.

[Bousolle]

Ok ... I understand  thanks

[PeWe]

I did like they describe here. http://www.mototuneusa.com/break_in_secrets.htm
I have seen the difference of the hard break-in and the easy break in I did in the 80's. The site is right, the rings must be sealed asap, the first 50km. Mineral oil 10W-40. Do at least the Dyno break-in but on the road


I had just done a break-in. Warm up, slowly drive to the road where I twisted the throttle to 4000rpm with following heavy throttle deceleration, then 6000 rpm and deceleration. Maybe 2-4 of these. Then up to 8000 rpm on 4:th gear, throttle off and heavy deceleration, geared down to 3-2 and still heavy decelerations. My rear tire lost grip. I did these a few times the first 50km. Then oil and filter change. New mineral oil 10W-40 and gave it some more of the same medicine for the next 200km.  I have new pistons w rings and fresh bores.

[SOHC4 Cafe Racer Fan]

I did like they describe here. http://www.mototuneusa.com/break_in_secrets.htm
I have seen the difference of the hard break-in and the easy break in I did in the 80's. The site is right, the rings must be sealed asap, the first 50km. Mineral oil 10W-40. Do at least the Dyno break-in but on the road


I had just done a break-in. Warm up, slowly drive to the road where I twisted the throttle to 4000rpm with following heavy throttle deceleration, then 6000 rpm and deceleration. Maybe 2-4 of these. Then up to 8000 rpm on 4:th gear, throttle off and heavy deceleration, geared down to 3-2 and still heavy decelerations. My rear tire lost grip. I did these a few times the first 50km. Then oil and filter change. New mineral oil 10W-40 and gave it some more of the same medicine for the next 200km.  I have new pistons w rings and fresh bores.

Not a bad article.  There is no single accepted way to run in a motor, and this piece makes that disclaimer (and that the topic is somewhat controversial).