Molaram

I just installed new OS 12CVR fromTower Hobbies in my XXX NT. The piston travels smooth throughout the entire stroke with the exception of TDC. It seems very tight there and almost "bumps" past TDC if I force the flywheel. I have dropped in some after run oil but it is still very tight. I have not run it it with fuel yet. Is this normal for a new engine?? I wan't sure if I should just go ahead...break it in with a rich mixture...and expect it to go away? Has anyone experienced this? I checked the connecting rod and it seems fine? Any responses are much appreciated.


Molaram

Chris Jarosz

Yes I had the same thing with my CVR and its fine now.

dirtracer1

yup, normal. just break it in and it'll be fine.

ProudSavageOwnr

yeah its normal....just dont turn the engine over alot without fuel in it orelse u will wear the internals and screw it up....

i got it on my thunder tiger .21 and i think its still there....lol

zrchobbies

iTrader: (1)

Just means ur "good to go" lol
All new piston and sleeve combos are like this it is how they maintain a seal in the cylinder to have compression since they don't have rings. You will hear it commonly reffered to as "pinch" when you don't have any more pinch its time to rebuild.

Molaram

Thanks for all the replies guys. Super fast! I'm off to break er in. Thanks again.

Molaram

zrchobbies

iTrader: (1)

Rock out have fun I'm at work.