As far as 4 stroke kits... I have noticed that some have what looks like a plastic trans cover:
While others show metal:
I think the difference is the plastic cover is a belt drive, while the metal cover is chain? Googling the two, belt seems preferable due to no stretching and less noise?
However, I'm thinking chain might be better since it's more sealed up, and you can load it up with grease. Belt looks more open and exposed to the elements and might wear out faster. How hard is it to get the good belts? Doing a generic search for bike replacement belt shows me ones that are questionable if they'd fit. They would probably be faster/easier to replace than a chain but not last as long, I'm guessing. But least chains are more readily available and more universal than belts.
I have seen the dual chain transmissions for sale...
https://www.ebay.com/itm/Parts-for-49cc-engine-motorized-Bike-4-stroke-DOUBLE-CHAIN-GEAR-BOX-TRANSMISSION/132376574786
As well as this kit that has a title saying it comes with "double chain", but it doesn't show the transmission:
https://www.amazon.com/gp/product/B08138QVZL/
While others show metal:
I think the difference is the plastic cover is a belt drive, while the metal cover is chain? Googling the two, belt seems preferable due to no stretching and less noise?
However, I'm thinking chain might be better since it's more sealed up, and you can load it up with grease. Belt looks more open and exposed to the elements and might wear out faster. How hard is it to get the good belts? Doing a generic search for bike replacement belt shows me ones that are questionable if they'd fit. They would probably be faster/easier to replace than a chain but not last as long, I'm guessing. But least chains are more readily available and more universal than belts.
I have seen the dual chain transmissions for sale...
https://www.ebay.com/itm/Parts-for-49cc-engine-motorized-Bike-4-stroke-DOUBLE-CHAIN-GEAR-BOX-TRANSMISSION/132376574786
As well as this kit that has a title saying it comes with "double chain", but it doesn't show the transmission:
https://www.amazon.com/gp/product/B08138QVZL/
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