THE BIGWHEEL THREAD!!! Yamaha BW350, BW200

is there anyway to per say have a bunch made for a group buy in here?so instead of costing us x amount from buying yamaha we could be saved some jing on it?Just a thought..

Y'know what i think im gonna try to do this with a chinese cdi to see if it works so I don't destroy an expensive cdi If i screw up

A few months ago truckinwagen had a 200 running on a Chinese cdi. His motor was on it's last legs and gave out as the experiment was in progress. It is definitely a possibility, but trying to find one with an ignition curve that will not cause detonation or preignition will be the challenge. There is even the possibility that the cdi contributed to the demise of truckinwagen's engine.

The 200 owners are starting to get desperate as they scramble to get one of the remaining working cdi's. Right now a timely solution would be awesome.

Are you up to the challenge, jaubuchon? The BW world awaits.

Regards,

Mr. BigWheel

I wonder if a TW200 Cdi would work on a bw200?

Hey everyone! Found this site after googling BW200 forums. I've had my BW200E for just over a year and love it. Been riding it alot this past summer and fall. It's in really good shape for 1986. I've spent all afternoon reading 49 pages of great info but was surprised to not read anything about aftermarket slipon pipes for the BW. I've been searching the web and EBay and found that an FMF Powercore4 will work on the BW200. I emailed FMF and they replied by saying that their pipe is the same as the pipe that fits a TW200. Although they have never fitted one on a BW. The FMF part number is 044312. A couple online MX stores have also stated that the pipe fits a BW. I'm so tempted to order a slipon from my local MX store but wanted to hear from some other members. Thanks!

Welcome Sticker!!!

Can anyone come up with an electrical schematic of the C.D.I. for 200's and the 350's??
has anyone opened one up ?
I just realised there is one on my parts bike but i need to see if it's good before doing an autopsy on it..
I have an Uncle who is quite the circutry genius and might be able to talk him into at least consulting on a kit or a full replacement with hopefully upgraded / more current (I.E.dependable) components ...if i can get a schematic to send him..
heck..if it was made once it CAN be replicated...and better ??

Hey guys, Got NOS piston, rings and gaskets for an 86 bw200 if anyone is interested. See it here: http://advrider.com/forums/showpost.php?p=20114532&postcount=9955

Sticker,

Welcome aboard. The FMF pipe DOES NOT fit the BW200 without some modification. It is a bolt-on proposition for the TW but requires the fabrication of a mounting bracket to fit to the BW. It would be worth the effort if you can pull it off though.

RWBWheel,

I have attempted to take a CDI apart and have determined the same thing that a bunch of others have:

a) It's a lot of work because the circuitry is encapsulated in either a potting compound or reeeeeeaaaallllly tough silicone (mine was silicone)

b) The circuit board will most likely get trashed getting the silicone or compound off. It may be difficult to determine what vacuum tubes and transistors were used if they are damaged during removal of the goo.

c) The potting compound or silicone will most likely have to be dissolved in a highly toxic, carcinogenic chemical solution to preserve the integrity of the circuit boards

d) You should limit your beer intake when trying to slice silicone off of circuitry with a razor blade (I don't know if anyone else actually determined this one. I may be on the "cutting edge" on this one. Ha!

There was a member on the BW Yahoo Groups who was working on the issue.

<a href="http://groups.yahoo.com/group/YAMAHABIGWHEELS/join">
<img src="http://us.i1.yimg.com/us.yimg.com/i/yg/img/i/us/ui/join.gif"
style="border: 0px;"
alt="Click to join YAMAHABIGWHEELS"/>
<p>Click to join YAMAHABIGWHEELS</p>
</a>
He was posting some encouraging x-ray images of the internals of the CDIs, but we haven't heard much lately.

It can't be impossible to find a CDI replacement. It's just going to take more beer than we have thrown at the project so far.

Regards,

Mr. BigWheel

Yamaha CDI info including a DIY tutorial but not sure it applies to the BW line. Tomas Schattat is mentioned and is an inmate here (schattat) maybe somebody could reach out to him and have some cdi built. The TW200 crowd is in the same leaky CDI boat so maybe there will be economy of scale. I know schattat builds and sells ICOs

http://www.transmic.net/en/89c2051.htm

This is a listing of the models of bikes that use the same CDI as the venerated xt350. I think that the XT350 would be a likely donor model for a replacement BW350 cdi. Please enjoy the listing:


MODELS:
DT100K - 1983
DT50L - 1988
DT50LC - 1988
DT50LC - 1989
DT50LC - 1990
DT50U - 1988
DT50W - 1989
DT80J - 1982
ENDURO - DT50A - 1990
RX50K - 1983
RX50L - 1984
RZ350L - 1984
RZ350N - 1985
RZ350NC - 1985
RZ350NCII - 1985
XT250K - 1983
XT250KC - 1983
XT250L - 1984
XT250LC - 1984
XT350 - XT350M - 2000
XT350 - XT350MC - 2000
XT350A - 1990
XT350AC (CA ED.) - 1990
XT350B - 1991
XT350BC - 1991
XT350D - 1992
XT350DC (CA ED.) - 1992
XT350E - 1993
XT350EC (CA ED.) - 1993
XT350F - 1994
XT350FC (CA ED.) - 1994
XT350G - 1995
XT350GC (CA ED.) - 1995
XT350H - 1996
XT350HC (CA ED.) - 1996
XT350J - 1997
XT350JC - 1997
XT350K - 1998
XT350KC - 1998
XT350L - 1999
XT350LC - 1999
XT350N - 1985
XT350NC (CA ED.) - 1985
XT350S - 1986
XT350SC (CA ED.) - 1986
XT350T - 1987
XT350TC (CA ED.) - 1987
XT350U - 1988
XT350UC (CA ED.) - 1988
XT350W - 1989
XT350WC (CA ED.) - 1989
YSR50A - 1990
YSR50B - 1991
YSR50D - 1992
YSR50T - 1987
YSR50U - 1988
YSR50W - 1989

UNIT ASSEMBLY CONTROL

YAMAHA # 4Y3-85590-M0

Remarkably, there is the four stroke 350 xt, a 250 four stroke, an 80cc two stroke, a 50cc two stroke pit bike and one of the world's most awesome bikes ever: the Kenny Roberts RZ350 two stroke, twin cylinder street bike, which uses the engine from the Banshee.

Does that seem like a possible cdi for just about any bike out there?

Should we try wiring one up or should I just contact schattat and avoid the entire piston-melting scenario?

Regards,

Mr. BigWheel

Yes thats a crazy application list for sure.

I now realize that the schattat on adv is Tony, i think thomas is his dad. Anyway they are both yamaha nuts in the rally arena and tony can probably be of help, he's the one building the rally computers....

There is also Ignitech in Europe for aftermarket CDI

http://www.ignitech.cz/english/poptavka.htm

Good thing the dollar is doing so well against the Euro.

Aww, crap!

What are the similiarities between a TW200 and BW200...if any?.I have a TW200(really like it).Just a curious question.

The engine thats about it on the bw 200 n tw200.I love the bw 200 it seems to go forever on a tankful of fuel.I rode it around all afternoon several months ago.I wasnt always easy on the throttle either,I must of rode it like 50 miles that day.I didnt even burn a half of tank of fuelToo bad they didnt make these street legal.

Mr. BigWheel, Thanks for the info regarding the FMF pipe. I'm pretty good at fabricating aluminum but I'm still debating on whether to buy a slipon or not. I searched YouTube for BW videos and their is a video of a BW with an FMF pipe on it. Can't remember which one but I'll try to find and post it here. It just shows the pipe on the bike but no pointers on install.

Rebelyell....thank you.

someone told me the 350's are a pig on gas, is that true?

I've been called a pig on a 350 before, but I don't believe that they are pigs on gas. Of course, they are not going to get as good m.p.g. as the thrifty 200 but manly, fire-breathing horsepower always comes at a price. On most rides, I spill more gas when the bike is upside down in rock piles than I burn in the engine.

The early TW shared the same forks and brakes as the BW200. I imagine the BWs would have gotten a disc front brake along with the TW had the line not been terminated.

The rear shock is also interchangeable between the TW200 and the 350, although the parts numbers don't match.

All three of the bikes utilize the same Female Repulsor. The 80s did not come equipped with a repulsor and as a result are often considered "cute."

Regards,

Mr. BigWheel

I tend to think the tw is a better design then the bw 200 because it usues a swingarm and not the jackshaft.THe jackshaft is not only heavy an power robbing,when I hd the sprockets and chains replaced the mechanic said even w the new hardware the chains seem to still have to much slack and the adjustability just isnt there. I was watching the videos of the alaskan outback.:eek1Holy crap the iditarod trail looks more like the I didnt ride trail because I crashed my brains out and got the bike stuck every 5 feet.I know the 350 is more manly then my lil 2 hunny moutain goat nanny but they are just so hard to fnd over the 2 hunny.