TRX250R.ORG

Workshop => Engine and Bottom End => Topic started by: jfwyatt1 on August 13, 2014, 08:20:25 PM

Title: esr pv cylinder break in?
Post by: jfwyatt1 on August 13, 2014, 08:20:25 PM
is there anything different i should know with the pv cylinder as opposed to a non pv? never had 1 before
Title: esr pv cylinder break in?
Post by: udontknowme on August 13, 2014, 09:41:10 PM
normally within 10min i let it rip :cool:

disclaimer : take extreme caution when following anything i do
Title: esr pv cylinder break in?
Post by: Tbone07 on August 13, 2014, 09:48:48 PM
No differences in break-in procedure. I do about 4-5 10 minute heat cycles. 2-3 10 minute slow riding sessions at no more than 1/2 throttle. Then let her rip.

You also can't go wrong with Duncan's break-in procedure. Although most will say it's a little much, better safe than sorry.

http://www.duncanracing.com/TechCenter/2stkenginebreakin.pdf
Title: esr pv cylinder break in?
Post by: Pumashine on August 13, 2014, 11:52:46 PM
Quote from: Tbone07;40873
You also can't go wrong with Duncan's break-in procedure. Although most will say it's a little much, better safe than sorry.
That is for sure! PV makes no difference on how you break it in. Just to be safe I never go over 3/4 throttle on the first tank of gas.  I have fried many a piston going to heavy on the throttle the first day. Always a complete tank just messing around. Relax and enjoy your new bore!
Title: esr pv cylinder break in?
Post by: udontknowme on August 14, 2014, 12:02:43 AM
Quote from: Pumashine;40887
 I have fried many a piston going to heavy on the throttle the first day.

do you happen to be using amsoil ?    :congratulatory:
Title: esr pv cylinder break in?
Post by: PORTED R on August 14, 2014, 05:58:37 AM
Honestly I really haven't done "proper" break ins
I got my motor back from nate ,started it up a few times ,checked for leaks ,went 300 foot racing next day
I recently pulled the head ,everything is super clean and lubed and great compression
Title: esr pv cylinder break in?
Post by: rablack21 on August 14, 2014, 08:34:16 AM
Quote from: Tbone07;40873
No differences in break-in procedure. I do about 4-5 10 minute heat cycles. 2-3 10 minute slow riding sessions at no more than 1/2 throttle. Then let her rip.

You also can't go wrong with Duncan's break-in procedure. Although most will say it's a little much, better safe than sorry.

http://www.duncanracing.com/TechCenter/2stkenginebreakin.pdf

I use this same method, Tbone. Overkill or not, this procedure works. I little extra care paid up front beats frying a piston and a fresh bore again.
Title: esr pv cylinder break in?
Post by: Pumashine on August 14, 2014, 09:16:56 AM
Quote from: PORTED R;40904
Honestly I really haven't done "proper" break ins
I got my motor back from nate ,started it up a few times ,checked for leaks ,went 300 foot racing next day
I recently pulled the head ,everything is super clean and lubed and great compression
Drag race builders put a .005 clearance on the piston too keep from seizing up at the track. When using the recommended .003 clearance you need a little time for the piston to wear in.
Title: esr pv cylinder break in?
Post by: Rupp250 on August 14, 2014, 09:30:37 AM
No "proper" break in on anything I run. Put it together, couple heat cycles idling in the garage. Recheck nuts bolts, let it rip.

And Ported R's motor is not a drag motor either. It is a dune setup that he just used to go racing.
Title: esr pv cylinder break in?
Post by: etccb on August 14, 2014, 09:54:35 AM
^^^^ I have always done the same myself. ^^^^
I am not saying it is right and you should do what you feel good about but I have always and will likely always do this.
Title: esr pv cylinder break in?
Post by: udontknowme on August 14, 2014, 08:33:14 PM
i dont understand the .005" for drag racers. whats the theory behind it supposed to be ?
Title: esr pv cylinder break in?
Post by: jfwyatt1 on August 14, 2014, 09:12:47 PM
thanks guys i just wanted to be sure. hopefully get around to putting everything together sat.