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Dmartin, we were thinking about adding this kit setup to our lineup. What size belt is desirable? what weights? which springs the most common?

Yeah, I'm ready to move to Ecuador, or Uruguay. JK, no, really. Importing chinese scooter parts and engines has been more and more of a hassle. When the Department of Homeland Security took over the port customs they started doing "random" container checks. They would halt our containers, then move them over to their warehouse, unload, inspect, reload, then send us a bill for the trouble. The cost of this, which happened 3 times in a row...randomly... went up almost 10 fold. Now we've been severely delayed by this west coast port strike which had our ship with our container anchored off the coast of california for what seemed forever. It finally got unloaded, and now the import warehouse is hassling us because there seems to be one extra box physically, but nobody knows where or what it is. In the meantime we've got customers blowing up our phones really pissed off as if we did this whole delay thing on purpose, like it would somehow benefit us to be out of stock. It's not too bad right now, just a few parts out of stock, but when this happens during the summer it's a nightmare!
I just don't know what to do. It's expensive to do business or manufacture or do anything anymore in the US. Permits, licenses, regulations, inspections, more and more do gooders getting more and more into your business and personal life and all the meanwhile the "service" of government gets more and more expensive and burdensome. Seems like you've got to be on the public doles or work for the government to even get by...or move to China and start a factory or business. They are flourishing from applying all the ways and means of doing business that we once pioneered here, but somehow we lost touch and cared about things other than being prosperous and successful.
Just my personal thoughts, and not the opinion of ScrappyDogScoooters officially.
Rick

OK, I see what you are saying. These have no indication on the outside as to what size they are. The cylinder is covered with the fan shroud.

Well, yes, they are gy6-150 engines, but a factory took these and built them with 50mm pistons instead of 57mm, so they have a displacement smaller than 150, but otherwise, they are complete, new in the box, running gy6-150
We're blowing these out cheap. Below is our ebay listing for it. If you are interested, simply PM me or email service@scrappydogscooters.com and we'll get one sent out to you. Top end kits are $50 bucks, or put a bbk on it, or just run it as is!
Dealers, if you want more than one, there are volume discounts.

www.ebay.com/itm/gy6-150cc-chinese-scooter-engine-new-motor-157qmj-taotao-vento-roketa-tank-ATV-/271756411133?ssPageName=STRK:MESE:IT

Yeah, not everyone wants a high revving scooter, but would rather have a high torque, responsive gy6 with some boost. Get this top quality taiwanese high torque head, with ram air tunnel effect intake manifold, A-14 cam and heavy rollers and with proper tuning, get a torque monster for real, everyday city riding.
check www.scrappydogscooters.com/125_150cc_Performance.html

The problem with installing rings in a used bore mainly is that new rings will ALWAYS have too large of an end gap. The reason is that the bore had been worn larger than the standard size. It will also be much wider at the top where compression gases put more force on the cylinder and therefore made the bore even larger at the top 5 or 10mm or more, which is where most amateurs check end gap, and the top of the cylinder. new rings, no matter where they come from, will have excessive ring end gap because they are going in a used cylinder. If the cylinder is properly de-glazed with a hone, that will break the glaze, but will also make the bore even larger, and larger end gap you will get as a result.
Bottom line. These things have cheap parts. Heck, a set of rings for my MV Agusta cost 10 times as much as a complete top end rebuild kit does for these. If you've spent the time to tear the engine down, why not do the job right and get everything new, and pay for decent parts from a reputable business? If it's to save money, you may realize it will cost you more money and time in the long run trying to save a few bucks up front.
For those that disagree, and want just rings, we certainly sell them separate, and use higher grade rings to last longer. They may look the same, but they are not. The customer is always right in this regard of what they want, so we give them whatever they please.
Just my personal opinion, and if you have any further tech questions, please contact MO! at tech@scrappydogscooters.com
or give us a call to order, or order off the website.