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600rs blown up AGAIN


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#1 mxzzx

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Posted 22 February 2021 - 05:07 PM

Sorry for another post on this sled but its becoming a headache.  Just rebuilt the top end for a melted piston and put 50 miles on it when the sled blew up again (Lost compression mag side).  Last time it melted the exhaust side of the piston but this time it snapped the piston ring.  Tiny piece of the ring broke off and chipped tiny piece of the piston crown (mustve broke on the down stroke).  HOW??  Cylinder looks perfect.  Any input here?

 

Piston wash looks perfect and engine passed leakdown test held 5psi for 15 minutes and probably couldve held much longer.

 

I'm stumped and not sure what to do.  I used SPI pistons and part of me almost thinks its a defective part but I really don't wanna buy doo pistons for this to happen again.  



#2 mxzzx

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Posted 22 February 2021 - 06:11 PM

Heres some pics

Attached Images

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#3 REV-O-LUTION

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Posted 22 February 2021 - 07:22 PM

    s p i piston versus OEM ..... should have went with the OEM ones ....just a thought     :rolleyes:     MCB also have dual rings piston available for those sled i think.....   :righton


       * LETS GET READY TO   RRRUMBLLLLLE !! *


#4 mxzzx

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Posted Yesterday, 09:13 AM

Can anyone back that up?  Think if I put a set of doo pistons in it then it would be fine?  I see a lot of people bash spi pistons but don't hear any people who installed them having problems



#5 Jcstacey8

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Posted Yesterday, 05:26 PM

need to run oem pistons on rs



#6 REV-O-LUTION

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Posted Yesterday, 06:36 PM

Can anyone back that up?  Think if I put a set of doo pistons in it then it would be fine?  I see a lot of people bash spi pistons but don't hear any people who installed them having problems

   well ...now you have one posting  about it  I M O ..


       * LETS GET READY TO   RRRUMBLLLLLE !! *





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