50 cc gy6 or qmb rear wheel spline By new2scooters (Read 4,593 times)

[new2scooters]

Greetings!

I'm just getting my feet wet on scooters after a 35 year absence. What I just picked up for a winter project is a new, in the box, no name scooter that was originally destined to be battery powered. Because of financial distress in the company I was able to purchase one (well, actually 4) at an extremely reasonable price. My intentions are to complete them as gas powered scooters. I've researched the VIN issue and it seems manageable. I was able to get several wiring diagrams of 50cc scoots off the net and that also seems manageable. Where I still have a question is on the rear wheel spline. The rear wheel that came with it has only 16 splines which doesn't match up with the new qmb 50cc engine short case I just purchased. It has 19 splines. Is 19 splines the industry standard? I've seen several good deals on used Yamaha Riva scooter wheels and am curious if something like that would fit....Also, what holds the wheel on? The end of the axle shaft is threaded so I am assuming a type of locknut will go on there. Do I install a washer first? All help is greatly appreciated. Thanks

[Bashan]

Well first off welcome to the forum. That's a very interesting project you have going on, I don't think that's ever been tried by anyone on the forum. I've never thought to count the splines on the rear wheel, they don't ask for that kind of information when you order a GY6 wheel. So I'm assuming that yes, if you ordered a stock GY6 engine then 19 splines is the norm. Now I'm not sure about Yamahas, that might be manufacturer specific. You better check with the seller before you purchase them. Here's a link to a page on a thread where I pretty much dismantled and reassembled my Bashan 150cc GY6 scooter. You can see how the wheel fits on and yes, there's a nut that goes on last without a washer that you use blue Loctite on. We'd love to see some pics of your project if you get time. The rotating banners at the top of the site are trusted vendors for parts and there's also a vendors board you'll see on the main page of the site. There's a boatload of manuals in the Library that you can peruse through. Let us know if you have anymore questions and hopefully someone on the forum with a Riva can give us some info on the Yamaha wheel. Rich

[new2scooters]

Thanks for the warm welcome and the info. It is certainly appreciated. I will try and post photo's as the project progresses. My latest find was a fuel tank that was delivered yesterday. It will fit nicely in the space available under the seat. I've found several other rear wheels that have different spline counts so there must be some variance in the older wheels as compared to the new ones which all seem to have 19....Only dates I have found on the scooter is 1984 stamped on the bottom of the seat frame and 1998 printed on the boxes the mirrors were in.

[sprocket]

Battery powered scooter usually have a chain drive rear wheel...you would probably be better to buy a rear wheel from a 50cc and adapt the frame to mount it...you will certainly need to do some welling and machining etc...that is if the frame will even allow room for a horizontal engine mount...

[new2scooters]

Hi,
Thanks for the input. This unit came with a splined 10" rear wheel with brake hub. It just is not the right size for the new QMB engine. I will start looking for a wheel that will fit when finances recover from the engine purchase. I don't know too much more about the origin of the scooter other than what was in my first entry. I did find another date today on the rear brake lining and it was 1995.... I will try and post a photo in the correct section for builds and update it periodically as it progresses. Welding and/or machining, if needed, will not be an issue....Thanks again for the input. It is appreciated.

[sprocket]

Sometimes the spline in a wheel can be replaced, but you will likely hydraulic need a press to remove it

[ncredleg]

I am going to check out a place that has alot of scooter parts tomorrow from wrecked scoots , etc.I can take pictures of what he has with the 19 spline. Most 50cc only have one shock and mount on the left side, so that should not be an issue for the right side bracket.

[new2scooters]

Dec 19, 2011 19:29:01 GMT -6 sprocket said:

Sometimes the spline in a wheel can be replaced, but you will likely hydraulic need a press to remove it

Spline is welded in so that avenue won't work. Thanks

[new2scooters]

Dec 19, 2011 23:28:05 GMT -6 ncredleg said:

I am going to check out a place that has alot of scooter parts tomorrow from wrecked scoots , etc.I can take pictures of what he has with the 19 spline. Most 50cc only have one shock and mount on the left side, so that should not be an issue for the right side bracket.

Thanks for the help. It does have only one shock and it is mounted on the left side.