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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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2002 EC125 Connecting Rod Trifercation
I bought back the 2002 EC125 I had a few years ago with a newly added crankcase inspection window in the bottom of the engine. I initially thought it might be a crank stuffer bolt but when I pulled it apart it was much worse. The connecting rod broke and in two places and the carnage was impressive.
I was told that the cases should be able to be repaired. I will know more tomorrow morning. I will need to weld the cylinder to fill the gouge, replate it and get a new piston so I might as well cut the bore bigger and make it a 144cc. That is a pretty easy choice for similar money! |
#2
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Wow, to snap a conrod like that must have taken some force.
I guess it didn't happen at idle RPM! Do you know what happened? Did the big end seize? If so why? Just interested to know. Hope you can get it fixed for a reasonable price. All the best, Dave. |
#3
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The guy said he warmed up the bike for 3 min and then rode it WOT through the gears. It bogged in 1st (probably not warm yet) and ripped through 2,3 and 4. Top end of 4th it locked solid. Both rod bearings looked fine as did the crank bearings. The piston and plug were perfect. Very strange.
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#4
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Sounds like a cold seizure to me.
Went full throttle for too long, too quickly before everything has warmed up to the correct tolerances together. |
#5
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Why are there no witness marks on the piston and cylinder of a bore seizure?
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#6
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Good point Zman.
What do you reckon it is then? Stress fatigue on the aged conrod? |
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