Question about 2003 Yamaha YZ 125
I have a yz 125 2003, it has a crack in the crank casing next to my kickstart, is it best to get it welded or the new casing? @
SOURCE: yz 250 wont kickstart
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
Press the Blue button please for my FREE effort,
Paul 'W' U.K.
Posted on Feb 06, 2009
You know aluminum can be welded very successfully now, so best bet is to remove that case and take it in to a good welder..You can ry the quick fix (JB Weld) is what i recommend, but success is rare !....good luck to you my friend...Tim
Posted on May 10, 2009
Yes , it seems that the case is broken which might require a welding and machining to fix. The engine cover has to be taken out for doing the job while the fault has occurred due to negligence. The kick start has a shaft with a bush which would have developed a play and thus the pressure was applied to the cover due to the play on the shaft,-- hence the oil leak .
Take estimate from a known mechanic / machine shop for the work before you start on it.
Posted on Feb 14, 2011
Yes it can be done, but Ally welding is not something for a novice. Find a local engineering company with a good reputation and they should be able to help.
Posted on Nov 11, 2012
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