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Old 07-28-2006, 11:37 PM   #1
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Default Tight Piston - Is this normal??

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.


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Old 07-28-2006, 11:39 PM   #2
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Yes I had the same thing with my CVR and its fine now.
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Old 07-28-2006, 11:50 PM   #3
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yup, normal. just break it in and it'll be fine.
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Old 07-29-2006, 04:19 AM   #4
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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
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Old 07-29-2006, 05:47 AM   #5
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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.
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Old 07-29-2006, 06:44 AM   #6
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Thanks for all the replies guys. Super fast! I'm off to break er in. Thanks again.

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Old 07-29-2006, 06:45 AM   #7
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