Rebuilding Chinese 2-stroke engine - photo tutorial

Fabian

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G'day all

Can someone post a photo tutorial with hi-res pics, showing the complete strip down (all the way to rebuilding the crankshaft) and rebuild process of a Chinese 2-stoke motorised bicycle engine.

Fabian
 
Here's 1 phpto

I don't know if this will help you at all, but it's a photo of my engine I took apart a month or so ago to replace all the hardwear with high strength. Sorry I didn't take more. The engines are pretty simple. Anyone with previous engine experiece should be able to do it with no problem. Not much to them. Dont be afraid to crack them open. Nothng will pop out or fall out of them unexpected. In the photo, you'll see the block halves just as it was when I opened them. Notice the cylinder and clutch plate in the plastic container to the left of the photo. I don't know much more than this. I did not remove the connection rod or anything other than what you see in this photo. If you want/need more info, let me know. I'll try to help.

..... PC .....
 

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Hi Porkchop

Great photo, nice hi-res image - exactly how photos should be posted!

Now can i ask that you do a visual inspection of all the parts, just to make sure everything is bedding in properly; taking lots of hi-res pics of the stripdown, all the way to the crankshaft, to show us where the "D" sized Duracell battery goes and naturally, rebuild process :)

Cheers Fabian
 
Hi Porkchop

Great photo, nice hi-res image - exactly how photos should be posted!

Now can i ask that you do a visual inspection of all the parts, just to make sure everything is bedding in properly; taking lots of hi-res pics of the stripdown, all the way to the crankshaft, to show us where the "D" sized Duracell battery goes and naturally, rebuild process :)

Cheers Fabian
Fabian, what "D" battery are you talking about? No batteries in my engine. I took only that one photo I posted. I know I said if you have more questions, just ask, but I mmight have spoken before I thought. As I said, I took that engine apart to upgrade all the nuts, bolts, studs or whatever. When I disassembled the engine, the piston rings fell apart into 6 pieces and there was a loose ball bearing inside the case. Good thing I took t apart. Otherwise I would have found out the hard way. This iis a brand new engine at that. It has never had fuel in it nor has ever been started. It's been a while ago since I did this and I don't remember much about it. It was pretty simple and straight forward. And again, like I said, there's nothing in there to pop out or surprise you. I ordered a set of new rings and several gaskets. Reassembled it with new hardwear, used Locktite on everythiing, torqued everything down to 8/ft. pounds as I was instructed here on the forum. If you have specific questions, let me know and I'll try to answer them from memmory. If you have an engine that you want to tear down, just do it. They're about as basic as you can get.
 
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Hi Porkchop

My comment about the battery was only to be taken as light humor - check out the upper left hand side of your photo.

I would still be very happy and grateful if you could make a photo tutorial the next time you rebuild an engine.

Kind regards

Fabian
 
Hi Porkchop

My comment about the battery was only to be taken as light humor - check out the upper left hand side of your photo.

I would still be very happy and grateful if you could make a photo tutorial the next time you rebuild an engine.

Kind regards

Fabian
Duh ! I wasn't offended at all. Now I get it. Just a little slow some time. Sorry I didn't take more photos. I took only one to send to a friend. As far as shooting photos of another build, there's probably not going to be any more. The one I have now is my first. I've had to many problems with it and it's never been mounted nor had fuel in it. And I'm not a rookie with stuff either. The bike I have that I was going to put it on is no longer a candidate. It's an old Schwinn that's to nice to modify or destroy. I'm in the market now for another bike to put it on. I've had this engine for aobut 6 months, so another 2 or 3 months is not going to hurt me. I have another friction drive that I ride regularly. It has been no problem at all. I didn't have to re-look at the photo. I know what batterty you're talking about. Anyway, are you fixing to tear down one of these engines ?
 
Now this is the first actual picture ive seen of the internals of this motor.


Im really surprised.... A full circle crank AND twin ring piston. Those look like very thick ring lands. Does anyone know their radial depth?


Also, do I not see an Iron sleeve in that cylinder?
 
Not super pro but the step by step engine tear downs by Norm are good.
 
Now this is the first actual picture ive seen of the internals of this motor.


Im really surprised.... A full circle crank AND twin ring piston. Those look like very thick ring lands. Does anyone know their radial depth?


Also, do I not see an Iron sleeve in that cylinder?
Correct-uh-mundo ! I was under the impression there was a cylinder liner as well, but there isnt. What do you mean by radila depth ? I'm not familiar with that term. I have a set of loose rings though. Explain and I'll measure them and post results. I know the piston mich'ed out at 47mm. That's the largest diameter. Not in the ring grooves.
 
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