New Chopper Build advice needed.

My father in law and a good friend of mine took on the task of motorizing one of these bikes, the follow story is based on the actual events that unfolded lol. So we wanted to mount the engine in the center of the bike, many with this frame mount it off to the side to clear the huge rear tire. In order to mount the engine center we had to install a jack shaft with a pair of sealed bearings, the shaft and a set of identical gears. It took 2 weeks for the gears to arrive in the mail.

We put the jack shaft on the bike and first clamped in place then welded clamps to frame when we got it where it was proper. We put the engine kit on and gave it its first trial run. The bike actually took like a tuning fork to the engine, the entire thing would vibrate your butt numb in under a blocks time.

We double checked all motor mounts and made sure everything on the bike was tight and the bike still vibrated like the dickens. After all that work my friend went to ride this bike home for the first time, he was not used to riding such a lower bike (usually he rides a mountain bike). He clipped his pedal on the ground while turning and crashed, the next day he wanted to put the engine back on his mountain bike.

So nearly a month of waiting, ordering parts, welding, fabricating down the drain lol. Good luck with your build ABC, I believe Manicmechanic used to make some kind of mount for this particular bike, I do believe he makes a sprocket adapter for it still (at any rate I'd ask Jim himself). Here in the states they sell them as Schwinn Stingrays so it might help to search the forum for that name as the bikes look identical. Good luck man!

you will need to fab a mount yourself,,,all the 4 stroke kits I have seen have no offset in the mount design

the good part is, 4stroke mounts are easy to build when the frame has a straight bottom tube (a steel plate, some holes drilled in the right places, and a few clamps )

8 holes are all you need to drill
4 for the muffler clamps to connect it to the frame
4 for the engine to bolt to the plate

my plate measures 4" X 7.5" (3/16 steel)

I'm sure you've seen this build that I'm working on I'm using Honda cloned chinese Pitbike/Dirtbike horizontal 4-Stroke engine fully automatic electric start, check these two Threads here's the Link's:

http://motorbicycling.com/f40/xl-chopper-4-stroke-pit-dirtbike-18970.html

http://motorbicycling.com/f40/dual-drive-freewheel-occ-xl-choppers-19143.html

Here's a pic of the unfinished XL-Chopper:

ADDICTED BICYCLES said:

That looks awesome. Looking at it, I wonder, can that plate (or one similar,) be attached without drilling? If the bolts were long, and braced with bottom brackets, that go beside the frame, instead of the bolts going through the frame. Do you know what I mean? Also, if I got a normal rear mount plate, and figured out how to frame mount and offset, think that would work? This seems like it's going to be quite a challenge to complete.

Click to expand...

I have no bolts running through my frame
you might have to use a wider piece of steel to get the off-set you need to clear the fat tire, but other than that, it is pretty simple

You know what might go well with that bike Addicted, an electric kit, it would be whisper quiet and would probably be much much easier to install. Yeah my buddy that bailed on his chopper is a natural skateboarder but not a cyclist at all lol.

Those Apehangers look sweet on that bike it almost looks like thats how it should have come. On my buddy jakes bike we put the handlebars pictured below on it, minus the pad and black bar, just bare renthal bars, they worked out really nicely and looked more sporty than the bars he had.

hey, here's where a bought my mount and exhaust. Barrys stuff is great. Motorized Schwinn OCC Chopper Bicycle MOTOR KIT MOUNT - eBay (item 280522740524 end time Jul-17-10 13:59:21 PDT)

Hi i am doing a stingray occ build i am using a two stroke though, so i dont know anything about mounting a four stroke... where did you get those bars i cant find any for the life of me !!!!!!!!