Hi guys,

A quick one, I have two sets of Max Power XL9 TQ piston and sleeves that have scoared on the exhaust port side. Can you still use the engines??

Depends - what is the compression like?

Have you looked at the inside of the sleeve to see what could be scoring the piston?

Chances are there buggered. It does depend on where the marks are, but having done the same thing myself it will more than likely be at the top of the piston and have an associated black mark to go with it. Cause is from trying to lean on the engine before its fully run in.

I was gonna say, if you have 2 that are like that it means that your running them way too lean.

i believe that if the scratch isnt deep enough and does not cover all the piston(up to down) you ll not have problems. Try spraying some wd40 on top of the piston (from the glow plug hole) while engine is assembled(without pipe), put glow plug and turn it over slowly.Check for any bubbles on the point of the scratch or if you can hear the air escaping from this point while engine is on compression.

hope i made myself clear.
good luck,

Hey guys thanks for all the feedback. From what I have read the assemblies ar toast. There are bubbles when I spary the WD40 in.

Frustrating thing about NR enginesm PS better to buy new engine than replacement kits.

Try a good pincher.

I would do that if I knew the P/S is on its way out and in need of a new one, otherwise the real good pinchers would put a fairly nice hole in your wallet from what I've heard

So who are the good pinchers??

RayA should be able to fix them up for you.

http://www.rctech.net/forum/offroad-...ooling-38.html

Thanks Sean, will check out his site. Worth a shot as these are good engines.