bashan bs200gy-18

[dossbag]

Interesting... Yes, mine feels like it's hurting above 60, no Idea what kina RMP I'm at though. But it feels like it would go all day at 55

[blueberry]

i have 250 km on her so far! i have not had a problem with the gas leaking. as for the gearing I'm going to pull the sprocket off and check the spacing and dementions and snap a pic to see if we can find some different gearing options. mine stock is 16/50 gearing with the 4 hole rear sprocket the bike will actually get to 67 mph. i feel with the gearing change it would push 75!

[culcune]

My guess is these are 1979-ish XL185--at least that is where I would start. JT Sprocket's site is very in depth as far as dimensions go, if you don't want to yank your own sprocket off, yet.

[blueberry]

well i pulled it off and got meashurments cuz im cool like that the inner ring appears to be 58mm or so. and the hole spacing looks like 55mm +- 1mm, Thanks to my advanced measuring tool xD

[Weldangrind]

Originally Posted by blueberry

well i pulled it off and got meashurments cuz im cool like that the inner ring appears to be 58mm or so. and the hole spacing looks like 55mm +- 1mm, Thanks to my advanced measuring tool xD

Use your precision device and measure the bolt holes diagonally. My guess is between 80 and 90mm.

[blueberry]

ok diagonal its 80mm on the dot!

[dossbag]

hmm... Mine looke wider.. again, high tech

~65mm square and.. ~95 diagonally

[Ogre81]

Rebel gear can custom make a set and their prices are reasonable.

[Weldangrind]

Dossbag, if you remove the sprocket for measuring and find a true 90mm diagonal bolt circle, 8.5 or 10.5mm bolt holes and a 58mm inside diameter, then a JTR269 should do nicely. You have a choice of 34 through 47, 49, 50, 51, 52 and 56 teeth.

http://www.jtsprockets.com/catalogue/sprocket/JTR269

[Weldangrind]

Blueberry, the closest I found would take some slight mods to work for you. The JTR810 has a 58mm inner diameter, 8.5mm bolt holes and a 78mm bolt circle. If you were to drill the bolt holes out to 2mm larger, it should fit your rear wheel. That would require a 27/64" drill bit.

You'd have a choice of 36, 37, 41, 42, 43, 46, 47, 48, 49 and 50 teeth.

http://www.jtsprockets.com/catalogue/sprocket/JTR810

[dossbag]

Thanks welangrind.. I should confirm that the proper way lol.. Great news if it is one of those. I may have ago this weekend.. Unless it's actually sunny here in MI, and in that case I'll be riding it.

Blueberry.. my apologies for riding your thread.. just got excited lol

[culcune]

Originally Posted by dossbag

Blueberry.. my apologies for riding your thread.. just got excited lol

Actually, if your sprockets are the same dimensions, and I am guessing they are, you both benefit, and anyone else with a 229cc or 200cc Storm (and I am guessing the other Bashan models, too).

I don't think I would go anywhere near the 30's--probably mid 40's at the most AND least.

Ogre--I had Rebel Gears make me a custom sprocket, but my complaint was it was too narrow, and chewed up a few chains, stranding me. I told them it was for a 428 chain, and since the TMEC uses an oddball bolt pattern (based on some European spec Yamahas, and some European branded bikes like Rieju) they were able to create my sprocket getting the dimensions from another brand's site...but the sprocket was too narrow, unless there are different chain variations of 428's? Very good and easy to deal with, and super fast service, too, so it might have been something I did...

[blueberry]

hey is it possible to just change 5th gear to make it taller? or to much work? thanks. i was thinking about doing it over the winter

[Weldangrind]

The short answer is no. The only real way to accomplish it is with a smaller rear or larger front sprocket.

[culcune]

Originally Posted by blueberry

hey is it possible to just change 5th gear to make it taller? or to much work? thanks. i was thinking about doing it over the winter

Weld is right! There is not too much stuff you can do INSIDE these engines--it is best to leave them alone and play with 'stuff' outside like carbs, exhaust, sprocket(s), etc. On mychinamoto, the longest, most read thread is about the Dongfang bobber bike--people have tried all kinds of engine mods (pretty much the same kinds of thumpers we all know and love), but it seems like they are always breaking once they do try something.