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Old 08-29-2008, 06:09 AM   #1
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Default Ninja Mr21 Help

Well, not sure on why, BUT, I seem to have broken a couple small chips off my lower-rear part of my piston.

I have the head and button off, the carb off, but cannot figure out how to disconnect the con rod from the crank..

Ideas????


Thanks
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Old 08-29-2008, 06:18 AM   #2
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Well the piston needs to be at the top of the stroke before you take the backplate off,or you will break the piston skirt off. To get the rod off the crank,you need to lift the sleeve out of the case by pushing up on the bottom with a toothbrush handle or piece of wood(something that won't scratch) the piston and rod will stay in block.with the piston up towards the top the rod should slide right off the crank. then the crank should slide out the back of the block(may be tight in the bearings) Pay attention to the way the piston and rod are put together,if you're gonna take them apart.
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Old 08-29-2008, 06:29 AM   #3
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Thanks

I did get it off..

I am guessing, this is bad:




Do I need a new sleeve as well?? Or just a piston head???
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Old 08-29-2008, 06:33 AM   #4
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Did you break it off when taking the back plate off? if so you probably don't need a sleeve,but it would probably be best to get both piston and sleeve.how much fuel through engine?
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Old 08-29-2008, 06:36 AM   #5
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Yeah, I am sure I did it when taking the back plate off..

I was holding the flywheel when I was taking the plate off, and it spun on me..
There are NO signs of damage inside the case. No shards, and metal flakes...

Thanks for the input..
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Old 08-29-2008, 06:39 AM   #6
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Ok no problem
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Old 08-29-2008, 06:44 AM   #7
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Sent you a PM
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Old 08-29-2008, 07:01 AM   #8
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you cant just change the piston, you have to change the piston sleeve they are a match, you could get a piston and sleeve from the newer grp engines, thay are basically the same thing
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