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Sx85 Making Ting sound when I try to start!

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Hi All,

So I pulled out my 2stroke 85 the other day, kicked it over...it started first kick.  After it ran for like 4 seconds it made this semi loud klick sound and immediately died. I kicked it over again expecting it to fire right up but instead, #1 It wouldn't start...(it was trying though) and #2 it sounded like the piston was hitting the head every time it came up!?  Not sure whats going on...Any Ideas? ? (if you need a more descriptive description of the noise etc., just ask)

Thanks in advance,

Slicing Air 

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14 hours ago, GreenMT_Rider said:

Sounds like a broken ring/ blown piston. 

Really!  I did just do the top end not 10 hrs ago...(on the bike).  I'll rip it apart and let you know what I find.  thanks 

  

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Scored piston...crankshaft is shot...I think the bearings fell out causing the scoring on the side of the piston.  I think (hope?) the cylinder and head are fine.   

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Was only the top end repaired or, the bottom end closely inspected for damage as well ?

 

Thinking your current failure is likely due to the previous one not fully resolved.

Edited by mlatour

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Just the top end was done.  Never touched the bottom.  Previous owner said he rebuilt the bottom end about ten hours before I got it.  He never had any proof of it though.

Edited by Slicing-Air

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In the right conditions, 1 hours with an improperly installed air filter is plenty to trash the bottom end.

Now's the right occasion to rebuild it top to bottom and have peace of mind for a while.

Edited by mlatour

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Irelevant in a 2-stroke,

the crankcase and gearbox do not share the same sump,

the premix lubes the engine side, the gearbox has it's own lubricant.

 

If not already done, I suggest you get a bike/model/year specific KTM service manual,

even for an experienced mechanic it's a necessity for proper procedures, list of tools, specs, torque specs etc.

 

 

Edited by mlatour

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