yamaha bw200 question

[muttblbc]

hi, Im completely unfamiliar with this bike and im tryin to replace the front chain and sprockets (from pto to inner sprocket on jack shaft) I ordered the 12 and 14 tooth sprockets from dennis kirk with a 520 chain and though the 14 tooth sprocket works the 12 slides over the splines just fine but the origional sprocket clip holes dont line up with the holes on the sprocket, also when comparing chains the inner chain was definatley not a 520. anyone got any advice on this?

[jb2wheels]

I had an 85 for years. As I recall, it's a #50 industrial chain from the engine to the jackshaft. Pitch is the same as 520 but the rollers are wider. You can probably uses a 50 chain on a 520 sprocket but not the other way around. I bought the chain at a local industrial supply house because I'm too cheap to pay $100 for it. That was back in the pre-Ebay days though.

I don't know what to tell you about the sprocket clip. I do vaguely recall I could only get sprockets from Yamaha because of the goofy chain size. The rear chain uses standard sprockets and chain. Good luck.

[cr480r]

Is there no slack adjustment for the front chain?? I saw a post somewhere here about an eccentric on the jackshaft for chain tension.. but after peeking at it myself and looking at the parts diagram i just dont see that being valid. Are these machines seriously built with no provisions for chain adjustement? Or am i missing something? My friends BW has a new #50 chain.. its sloppy and sags a ton.. yet its too tight to shorten it with an offset link.. Vealmonkey? Or any other Big wheelers out there have some input on this ?

http://www.bikebandit.com/houseofmotorcycles/1985-yamaha-bw200n/o/m7030#sch227960

[640AK]

The engine-to-jackshaft chain is a #50 as mentioned above. Most people use 530 chains which seem more common since most big bore sport bikes use them as well.

The jackshaft-to-rear wheel chain is a 520. Don't mix and match the sprockets and chains or you will have drastically shortened component life.

The primary chain is adjustable. The eccentric bushings are located on the swingarm pivot. This moves the entire swingarm fore and aft to adjust the tension. It takes a tool that was included in the bike's tool kit 25 years ago. They can be fabricated fairly easily though. If the bushings are seized to the swingarm, you have a big project ahead of you.

Regards,

Mr. BigWheel

[Vealmonkey]

Sorry about not seeing this earlier, but 640AK is absolutely correct in what he says. The only thing is there is not that much adjustment at all though. So you have to have your chain fairly close for the adjustment. Also, it seems as most of the chains come with the press on links, which you need a special tool for. You may want to pick up an extra clip on link or 2 and maybe a half link or 2 as well.

[cr480r]

Thanks a ton guys. It all makes perfect sense now.