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HelicopterEngines Plugs Mufflers Fuel › Ys 120 conrod wear....
12-16-2013 02:58 PM  3 years agoPost 1
jwatts007

rrNovice

England

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I have got through 2 of them this year...the conrod is being ground flat against the back plate and is showing scuff marks up the length of the conrod...I am sending it too the YS distributor too have a look at...any ideas what would cause this....

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12-16-2013 07:36 PM  3 years agoPost 2
Glenn Goodlett

rrApprentice

California

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Crank not pulled in all the way. Rear bearing not in all the way. Crankcase not machined right. Just ideas. I've never heard of that problem.

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12-16-2013 10:32 PM  3 years agoPost 3
BONO1

rrApprentice

AR

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Most likely you had fuel in the cylinder and caused excess pressure on the piston and rod when starting the engine.

Sam

blow smoke

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