Motor not running residue on pistons

[crts_lmbrt6]

Last year my 2012 pro 800 developed a top end bog at 7600 rpm and it would kick it down to 6800 rpm so this fall I tore it down trying to figure out what was causing it and when I did I found this chalky residue on the pistons I was hoping someone could tell me what it is and what the problem could be.
Thanks guys

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[Cat401]

Green and chalky.....coolant leak??

 

[JMCX]

All I see is normal carbon build-up. Was the bog a permanent development or something intermittent?

 

[lsone]

sounds like it could be a spanked primary spring

 

[neilsleder]

You run ethanol fuel? I checked my plugs one time on my old summit I filled up at husky, and my plug looked like that.


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[crts_lmbrt6]

I had the clutches rebuilt but the issue still persists I can't figure out what is cause the bog

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[HotShotHarry]

Check the bellows for damage and replace the springs in the exhaust valves.

 

[crts_lmbrt6]

Check the exhaust valves and they're good I'll replace the springs for good measure

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[andrew3399]

Check the exhaust valves and they're good I'll replace the springs for good measure

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Replace piston and rings. Have a look at the rings. You will see chipping in them. Loosing seal and creating bog.

 

[dragonweld28]

Get the MTNTK fix kit!! you already have it tore apart. sounds like your getting some blow by the rings already. spend the 700 and rebuild that sucker!!

 

[Chump]

Totally agree. Do the fix kit. It'll take out a jug if it goes, And cost you triple the cost of the fix kit.

 

[crts_lmbrt6]

Crap I put the rktek kit in two years ago I thought I'd get more milage out of it

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[dragonweld28]

I have said it a bunch of times on this forum!!! don't use RtTek junk!! stick with a company that knows what there doing. MTNTK is the only kit to run!!

 

[crts_lmbrt6]

Would the rings being gone also account for the sled not being able to hold an idle the not being able to start afterwards

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[CatMan16]

Would the rings being gone also account for the sled not being able to hold an idle the not being able to start afterwards

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Yes and it would have a hard time firing to go into reverse as well. Did you check the compression before you pulled the heads?

 

[crts_lmbrt6]

No I didn't this time but before I put it away last spring I did and the compression was good

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[JMCX]

You haven't said whether the problem is all the time or comes and goes.

 

[crts_lmbrt6]

It's all the time

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[scrfce]

Check your reeds, could have some pedals chipped or broken

 

[crts_lmbrt6]

That was my first thought but they look brand new

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