Any experience with pull start 50cc 2 strokes on amazon

WacoMoto

WacoMoto

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I've been looking to source a supply of 50cc engines with either pull or kick start assemblies to start building mopeds on a custom frame. I was going to build the frame around the engines and tires and I've been looking at the horizontal oriented 2 strokes that you can find on amazon. They're mainly pull start and come with a torque converter (5/1 ratio) I'll most likely pair mine with either a clone or if the customer wants to pay the American Tax a comet torque converter going to a 10 inch scooter tire. I have a few questions
Does anyone have any experience with these engine?
Is there any documentation like output shaft size?
Do they have any electrical generation capacity to run lights or other electrical accessories?
Any main manufactures that I can contact directly about parts and bulk orders instead of random amazon resellers? I've looked on alibaba but I can't seem to find any direct suppliers.
50cc 2 stroke amazon engine.jpg
 
WacoMoto said:
Does anyone have any experience with these engine?
Is there any documentation like output shaft size?
WacoMoto said:
Do they have any electrical generation capacity to run lights or other electrical accessories?
Click to expand...
Click to expand...
I had one, dropped it on the floor and cracked the case. You could probably get several for cheaper. There is actually 43cc and 49cc motors with electric start based off a mitsubishi tle43. I think the shaft on the pocketbike motor is 15mm where the clutch shoes go. I don't think they have a torque converter but a centrifugal clutch. Some of the transmissions use tiny chains on the inside and tiny gears. You could probably fit a more robust transmission like the 4G belt drive on there as the 49cc 4 strokes they are used on should be the same bolt pattern as the pocketbike engine.
 
I also have thought about building a cheap/budget build with one of these. Phatmoto frames have a flat plate one could be mounted on either the cag or 49cc 4 stroke huasheng motors. I often wondered why they went with a governed 79cc with a top speed of 32 mph. instead of the 49cc since the 49cc can go just as fast stock, in the mid-upper 30s and revs much higher than 3600 rpm.
 
Will'smotobikes19 said:
I had one, dropped it on the floor and cracked the case. You could probably get several for cheaper. There is actually 43cc and 49cc motors with electric start based off a mitsubishi tle43. I think the shaft on the pocketbike motor is 15mm where the clutch shoes go. I don't think they have a torque converter but a centrifugal clutch. Some of the transmissions use tiny chains on the inside and tiny gears. You could probably fit a more robust transmission like the 4G belt drive on there as the 49cc 4 strokes they are used on should be the same bolt pattern as the pocketbike engine.
Click to expand...
From what information I could find it was a centrifugal clutch with a 5:1 reduction ratio, Since I'm going to be using these for production I want to give people abit more capacity for varying road conditions and environments that's why I'd rather use a 30 series clone with a 3.13 low 1.12 high ratios similar to the 30C and 31D7 ratios found on the comet torque converters
 
upon further research I've found that EPA regulations now include 49cc engines when it comes to emissions standards so I suppose if I want to become a certified manufacturer then I'm going to need to stick with the 4 stroke engines.
 
WacoMoto said:
upon further research I've found that EPA regulations now include 49cc engines when it comes to emissions standards so I suppose if I want to become a certified manufacturer then I'm going to need to stick with the 4 stroke engines.
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One thing to watch out for is the belt drives that use a bushing, mainly used on 15mm or 5/8 straight shaft engines. They use a plain brass bushing that quickly seizes to the clutch bell if you don't lube it every ride or two. There's no where to soak up the oil since it's plain brass. Belt drive with a bearing mounted clutch bell is probably the best design. Idk if a torque converter meant for 212s and similar would work. Those are mainly for 3/4 shaft. On the 49cc huashengs there are tapered shaft and straight shaft. I don't think a torque converter is needed. Some kits use the cheap chain drive transmission I had a problem with the sprocket shaft coming out of the transmission. I'd go belt drive. Like I said if you could find the right frame and weld on a flat plate there would be no need for the jenky adjustable plate that they use. So far the only production bike with a flat welded on plate that I know about are phatmotos.
 
Another guy said he has a comet 99 tav on his tecumseh 2 stroke engine that was on a minibike. I don't know if there's any torque converters that would work on a huasheng or if the 5/8 shaft motor has a long enough shaft for a converter.
 
Will'smotobikes19 said:
One thing to watch out for is the belt drives that use a bushing, mainly used on 15mm or 5/8 straight shaft engines. They use a plain brass bushing that quickly seizes to the clutch bell if you don't lube it every ride or two. There's no where to soak up the oil since it's plain brass. Belt drive with a bearing mounted clutch bell is probably the best design. Idk if a torque converter meant for 212s and similar would work. Those are mainly for 3/4 shaft. On the 49cc huashengs there are tapered shaft and straight shaft. I don't think a torque converter is needed. Some kits use the cheap chain drive transmission I had a problem with the sprocket shaft coming out of the transmission. I'd go belt drive. Like I said if you could find the right frame and weld on a flat plate there would be no need for the jenky adjustable plate that they use. So far the only production bike with a flat welded on plate that I know about are phatmotos.
Click to expand...
I have one of these plain bushings on the 100 cc motor I have. Some time back there was a lot a lot of discussion here about correcting this.

What I plan to do with my bushing is cut a couple of curved grooves in it and drill a small hole in the clutch housing with an alignment mark so grease can be added with a chainsaw grease gun.

I'll have to do it and post some pics. The rain here hasn't stopped for days so a good a time as any to do it.
 

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