How to make a China 2-stroke 48cc / 66cc last forever???

BillMckraken

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So I've seen lots of posts on performance and maxing speed. I'm curious, starting with a brand new china engine 48 or 66cc; what all can be done to make it last forever......well as long as possible? The reliability of these engines, from what I can tell, is scary at best.
The focus here then, is not more power or final speed, only reliability. I'm not an engine expert nor have I messed with these engines, however some reading online has given me ideas to start the ball rolling.

- First I assume do all the steps from the Pre-build checklist on this site here. http://www.motoredbikes.com/showthread.php?t=11986 (sorry for broken link)

- Second replace bearings in the engine, right?
have found from searching I guess, from what I've read that's figured out. SKF 6202-2RSH Roller bearings (4) and INA K10X14X13-TV or INA KBK10X14X13 or gilardoni 10x14x13 needle bearing for the top connecting rod (credit here http://motorbicycling.com/f13/66cc-engine-tear-down-setting-high-27007.html )

- Third, Port the intake and exhaust? I know everyone seems to do this for performance but would it also help reliability?


Like I said I don't know much here but I think maybe these few things will help? Anyone have any ideas?
 
I've heard of some of these engines lasting a couple thousand miles when treated right, but that is not going to be the norm
 
This is a great topic. Was also wondering how weather would effect the engine performance if you ran it in winter a lot. Maybe it is warranted to consider alternative small engines to last longer?
 
"what all can be done to make it last forever" = park it in the garage.
All kidding aside.. Take your time and build it RIGHT. There are quite a few things that I do as it comes out of the box. Make sure that it is mounted correctly, and I don't mean "looks" correct.
 
Well, if your going to purchase a China engine and rebuild it to make it last longer. Why no just buy one that is built correctly. It will cost ya about twice as much, but 'should' perform and last much longer. Check out RockSolidEngines.com. This guy has traveled to China and found better parts for his engine builds. Looks like the Gumbee engine, but don't let that fool ya. It comes with better bearings, better casting, better carb, intake, etc. You can even get a high compression head and ceramic coated piston (If ya feel the need). The engine is balanced also! Big plus.
Only downside is he is located in Australia, shipping is a killer :) But, if I ever bought a China engine again, it would be from this guy.
I've done business with this company before, and they are great!
This is not a plug, it's only FYI.
 
well that's the thing, the shipping costs from Australia adds a HUGE amount to the overall cost. I would consider buying an engine like his... if it weren't for the huge extra shipping cost.
 
What would I do to a ht motor

I think the #1 thing to do would be to balance the crank. These things vibrate themselves into annihilation.
 
Well, if your going to purchase a China engine and rebuild it to make it last longer. Why no just buy one that is built correctly. It will cost ya about twice as much, but 'should' perform and last much longer. Check out RockSolidEngines.com. This guy has traveled to China and found better parts for his engine builds. Looks like the Gumbee engine, but don't let that fool ya. It comes with better bearings, better casting, better carb, intake, etc. You can even get a high compression head and ceramic coated piston (If ya feel the need). The engine is balanced also! Big plus.
Only downside is he is located in Australia, shipping is a killer :) But, if I ever bought a China engine again, it would be from this guy.
I've done business with this company before, and they are great!
This is not a plug, it's only FYI.

Seems like this Aussie is missing the boat. He should team up with someone like Pirate Cycles and have the engines shipped to them for sale on a commission basis! At least thats the way I think!
 
Yes. Rocksolidengines should just license his source to a distributer in the states. But there might be a problem with importing 2 cycle engines, without that polution-EPA inspection on that specific engine. But that prevents better engines from getting over here.

Has thinking the Honda engine with the staton drive is a best option. Honda last forever and keeps up a supply chain of parts.
 
Seems like this Aussie is missing the boat. He should team up with someone like Pirate Cycles and have the engines shipped to them for sale on a commission basis! At least thats the way I think!

or, someone in the States should do a thorough rebuild treatment... importing Rock Solid rebuilds, even in "bulk", isn't going to keep the price down, might even make the price go up (because each person who touches it will want to make money from it)
 
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