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Norm's 2 stroke repair center Having problems with you 2 stroke motorized bicycke engine? Just ask Norm. he loves to tinker and troubleshoot engines.

I need some help with top end rebuild


Discussion at Motorized Bicycle Engine Kit Forum in the Norm's 2 stroke repair center forum. OK I ordered my parts and I am going to change the piston head and install new rings, I checked ...
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Old 08-29-2009, 07:38 PM
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Default I need some help with top end rebuild

OK I ordered my parts and I am going to change the piston head and install new rings,
I checked norms 'Bicycle engine total tear down' post I removed the wrist pin but after that I do not know how to remove the piston head from the crank arm.

I am noob to this particular repair, but ready to take it on.

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i-need-some-help-top-end-dsc02020.jpg  

Last edited by MarcPhotoMan : 08-29-2009 at 07:43 PM.
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Old 08-30-2009, 12:27 PM
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Default Re: I need some help with top end rebuild

Did you remove the wrist pin keepers? You did remove the wrist pin too didn't you? You remove usually one keeper the little clip thing, and then you can push the wrist pin out on the side that you removed the keeper from if the wrist pin is hard to remove use a wooded dowel to help you push it out and you can warm up the piston by wrapping it with a rag soaked in hot water. Let the rag sit warped around the piston for a bit a couple of minutes should do it then try to push out the wrist pin you might need to remove both wrist pin clips if its hard to remove. Do not beat on it or scratch the pistons wrist pin holes.
Is your wrist pin bushed or is a needle bearing? Either way if the wrist pin is out the piston should come off.
Norman
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Last edited by Norman : 08-30-2009 at 12:32 PM.
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Old 08-30-2009, 05:38 PM
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Default Re: I need some help with top end rebuild

The wooden dowel worked like a charm thanks, I plan to update this post as I move along through my repair. This might eventually help another noob to the top end rebuild!

Pic 1: Here is a pic my bike looking very sad
Pic 2: how a dowel fits into the piston
Pic 3: I believe that is the Tit
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i-need-some-help-top-end-sad.jpg  i-need-some-help-top-end-dowel.jpg  i-need-some-help-top-end-tit.jpg  

Last edited by MarcPhotoMan : 08-30-2009 at 05:40 PM.
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Old 08-30-2009, 06:51 PM
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Default Re: I need some help with top end rebuild

Pic 4: Roller bearing
Pic 5: Crank arm
Pic 6: Bottom tit
Pic 7: Crank case before cleaning
Attached Thumbnails
i-need-some-help-top-end-roller.jpg  i-need-some-help-top-end-crank.jpg  i-need-some-help-top-end-tit2.jpg  i-need-some-help-top-end-crank-case.jpg  
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Old 08-30-2009, 09:23 PM
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Default Re: I need some help with top end rebuild

looks like your getting it done. you might be doing this soon
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Old 08-30-2009, 11:01 PM
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Default Re: I need some help with top end rebuild

We can do It!
With a little help from our friends.
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Old 08-31-2009, 07:53 PM
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Default Re: I need some help with top end rebuild

I was talking to a coworker about how my repair was going so far.
I told how the pin was hard to take out and that the roller bearing came out easily.

He was saying that when he had repaired his dirt bike that roller bearing was snug in the crank arm, is this the case with these engines?

Do I need an new roller bearing and wrist pin to?

Last edited by MarcPhotoMan : 08-31-2009 at 08:40 PM.
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Old 09-01-2009, 07:46 PM
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Default Re: I need some help with top end rebuild

Is There supposed to be a wrist pin bushing on the crank arm when i took the piston there was not one there.
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Old 09-01-2009, 08:07 PM
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Default Re: I need some help with top end rebuild

The needle bearing and the bushing have the same part number, so my thinking is that They are interchangeable parts

Last edited by MarcPhotoMan : 09-01-2009 at 09:07 PM.
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