DO THE TON

Blood Sweat Tears and Grease => Projects => Enduro / Dirt / Scramblers => Topic started by: Hurco550 on Apr 25, 2018, 23:06:09

Title: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on Apr 25, 2018, 23:06:09
I've long wanted to own a Yamaha tw200, but every time I've found one for sale, people tend to be pretty proud of them and ask what is in my opinion a little bit too much money for a long production run small CC bike. That is until yesterday when my "harmless"  daily Facebook Marketplace search turned into a spur of the moment 4 Hour round trip after work to go pick this gem up. It's a 1988 model that has been robbed of a few parts by the previous owner to keep another tw200 on the road. Since it's incomplete, I don't feel too horrible about some minor customization to turn it into a neat and quirky little trail bike.

As far as the title goes, it's the same old story. It was in his grandpas name, grandpa died and he cant find the title. I did have him fill out a bill of sale, so I can go the vt route, but at the moment it may get a spare tag thrown on to bop from trail to the next.

The plan for the bike is to make it a fun, cheap little ride to take with me Down to Georgia When I visit the in-laws which is usually about 6 times a year. My dr650 is a blast, but after riding Mr. E's meatwad xr200, I realized how much fun a small CC lightweight beater bike can be. I've seen pictures on and off for a few years of this red tw200 around and have always thought it has a neat look with a vintage tank and stripped down Style. At the bones it is kind of my inspiration for this build with the exception of a few things added that will make it more rideable off road including fenders and the stock airbox.

I have also kicked around the idea of running another rear wheel out front. There are a few good forum posts online, and it's a fairly straightforward project which uses BW 200 Forks and triples.

One of the things that has always drawn me to these little bikes is the unique and almost comically disproportionate balloon rear tire. Replacement tire options are a little bit few and far between, but there are actually a few larger ATV tires that fit and are also d o t rated

Progress may be slow but I will try and keep the thread updated as I go

(https://uploads.tapatalk-cdn.com/20180426/3d022d4353384ae8ab0ab36d49347d1a.jpg)(https://uploads.tapatalk-cdn.com/20180426/f963c447341a3b2956c493741ebad618.jpg)(https://uploads.tapatalk-cdn.com/20180426/234c9f05f4f2ecdf668c17fb96676e27.jpg)(https://uploads.tapatalk-cdn.com/20180426/fe43da224825b1d06760fa097084f78d.jpg)(https://uploads.tapatalk-cdn.com/20180426/7b7c52e021dd4630dd1eadeb4c3a0f18.jpg)

Sent from my SM-G920V using Tapatalk
Title: Re: Yamaha TW200.. the swamp donkey
Post by: irk miller on Apr 25, 2018, 23:38:11
(https://i.pinimg.com/originals/48/09/32/480932bbe1d53d533058bfccfff45343.gif)
Title: Re: Yamaha TW200.. the swamp donkey
Post by: canyoncarver on Apr 25, 2018, 23:50:41
I looked it up and found Swamp Donkey on Urban Dictionary.  Very colorful description.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on Apr 25, 2018, 23:53:42
I looked it up and found Swamp Donkey on Urban Dictionary.  Very colorful description.
Ha. Well that definition still fits, but here in the Midwest it's another name for a deer..

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: cbrianroll on Apr 26, 2018, 01:16:27
This is my buddys...it sees mud and sand and does well. I want it....if I ever get a promotion at work in going to get a new one.
Title: Yamaha TW200.. the swamp donkey
Post by: Kanticoy on Apr 26, 2018, 09:34:12
Some would say you could be described as a swamp donkey. Good get, itís funny how we are all looking for small cc trail bikes at the same time.


Sent from my iPhone using DO THE TON
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on Apr 26, 2018, 09:44:00


Good get, itís funny how we are all looking for small cc trail bikes at the same time.


Sent from my iPhone using DO THE TON

After seeing how much fun Ephraim has on meatwad, I decided that a lightweight may be more fun than constantly man handling that dr650 off-road (even though it does the job well). There is just something about a cheap, simple beater bike that is appealing to me. Bare bones, no fluff, kinda like taking the original cafe racer ideals and transferring them to a small off-road machine.


Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Brodie on Apr 26, 2018, 19:02:07
I love my XL250. No worries all-rounder.
That engine looks a lot like the Sr250/xt250 engine.
Big bore might be easy.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on Apr 26, 2018, 19:03:51
I love my XL250. No worries all-rounder.
That engine looks a lot like the Sr engine.
I'm sure there are plenty of similarities with the Sr lump. I know with some hackery people have swapped them into the tw,s

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Brodie on Apr 26, 2018, 19:06:23
I always thought about sticking in a BW350 engine in my old SR but they were not sold here. Might be another option. Why I am giving options I don't know.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: advCo on Apr 26, 2018, 19:44:27
YISSSS.

The XL200r tank/seat I have would go perfect on this  ;)
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on Apr 26, 2018, 19:46:06
YISSSS.

The XL200r tank/seat I have would go perfect on this  ;)
Hmmmm I'm in the market... I'm gonna go raid Ephraims party shack for goodies this weekend, but if I can't steal anything that fits the bill I may hit you up

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: JustinLonghorn on Apr 27, 2018, 13:39:50
Yep.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on Apr 27, 2018, 18:22:35
This is my buddys...it sees mud and sand and does well. I want it....if I ever get a promotion at work in going to get a new one.
You mind asking him what tire (and size) he is running out front?

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Rider52 on Apr 27, 2018, 19:30:55
This should be a great project!
Title: Re: Yamaha TW200.. the swamp donkey
Post by: cbrianroll on May 05, 2018, 14:54:03
Yeah man no prob...gimme a few

Sent from my SM-G930V using DO THE TON mobile app (http://r.tapatalk.com/byo?rid=89466)

Title: Re: Yamaha TW200.. the swamp donkey
Post by: cbrianroll on May 05, 2018, 22:58:58
130/90/18

Sent from my SM-G930V using DO THE TON mobile app (http://r.tapatalk.com/byo?rid=89466)

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on May 06, 2018, 22:24:15
130/90/18

Sent from my SM-G930V using DO THE TON mobile app (http://r.tapatalk.com/byo?rid=89466)
Thanks man!

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on May 06, 2018, 22:28:26
 Scored a pair of Honda ruckus headlights off of irk. That paired with a stock dr650 front fender should be the business. (https://uploads.tapatalk-cdn.com/20180507/565dead5275aab33276220da3720477a.jpg)(https://uploads.tapatalk-cdn.com/20180507/61a4d771e43de8da6df7e1ce029ffeb3.jpg)

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Drey6 on May 06, 2018, 23:04:43
Lookin kewl


Sent from my iPhone using Tapatalk Pro
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on May 16, 2018, 13:10:23
Ive been slacking a bit on updates, but I have still been tinkering around on this thing. I pulled the motor out and finally got the side cases (that a previous owner had graciously decided to use jb weld as "gasket material") pulled off, beit with a good amount of grunts, bloody knuckles and ez outs since ever single phillips head had been rounded off. What I found when I drained the oil was a highly undesirable paste of goo and metal shaving, along with a little more goo, and just when I thought I had found it all, more metal shavings.

Now, after a little bit of google-fu and some forum reading, ive found that these little tw lumps are notorious for shedding metal shavings, and there is a hippy esqe attitude in "the tw200 groups" of shavings are fine, just run it, but even so, there seemed to me an obnoxious amount of them. I figured no time like the present to dig in and see where they are coming from. I wasn't planning on splitting the cases, but I guess plans change. Upon removing the inspection cover for the cam chain, I had a "well theres your problem" moment. The engine was pretty obviously starved of oil at some point and the aluminum cam bushing had been eaten away.

To remedy this I will need source a roller bearing and a new cam. Its been done before and documented, so hopefully wont be to big of a deal.

Also, here is the expected pic of parts piling up for the build ;)
(https://uploads.tapatalk-cdn.com/20180516/659f3f33ab3708fdbd93260cc3bcf9f8.jpg)(https://uploads.tapatalk-cdn.com/20180516/4ff695e68a94379e534077b9090b4191.jpg)(https://uploads.tapatalk-cdn.com/20180516/d96322b9f58fb2e8cadb7b7ed10fe56b.jpg)(https://uploads.tapatalk-cdn.com/20180516/a4ea61cbe0444f95eb6dc9075b1e7ec7.jpg)(https://uploads.tapatalk-cdn.com/20180516/9d8e15ef8f2dcb71ac7628c57671d13e.jpg)(https://uploads.tapatalk-cdn.com/20180516/81a268dfe2afc6f92e7c7a71da53bf0b.jpg)(https://uploads.tapatalk-cdn.com/20180516/2351c628e2c704dc322278b421a8849d.jpg)(https://uploads.tapatalk-cdn.com/20180516/df30b445be9e5c023786ed85e3383968.jpg)(https://uploads.tapatalk-cdn.com/20180516/5af2d1298d6bef8d6841f31abe1711cd.jpg)(https://uploads.tapatalk-cdn.com/20180516/40e0ce623d7ad2a11969c37ee60c7704.jpg)
Title: Re: Yamaha TW200.. the swamp donkey
Post by: canyoncarver on May 16, 2018, 17:05:22
That was a lot of metal in there. What's the parts scene like on these motors?
Title: Re: Yamaha TW200.. the swamp donkey
Post by: irk miller on May 16, 2018, 18:32:09
Just curious if you're to the point where this becomes a parts bike for another one, or if it's really worth rebuilding what you have.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Brodie on May 16, 2018, 18:56:51
I still say stick a bw350 engine in it...
Title: Re: Yamaha TW200.. the swamp donkey
Post by: irk miller on May 16, 2018, 19:06:25
That ^
Title: Yamaha TW200.. the swamp donkey
Post by: farmer92 on May 16, 2018, 19:10:59
(https://uploads.tapatalk-cdn.com/20180516/ea6a6c803815654be9ca65ffa5697c92.jpg)

Iíd say heís around the ďat least itís not more broken than when he startedĒ point
Title: Re: Yamaha TW200.. the swamp donkey
Post by: ridesolo on May 16, 2018, 21:36:30
I knew you should have kept that XL650 lump!  Some silicone spray, a shoehorn, and a little time and you'd be riding. 
Title: Re: Yamaha TW200.. the swamp donkey
Post by: cbrianroll on May 16, 2018, 22:00:11
Doesn't their 250 motor fit it or parts compatible?  I thought my buddy mentioned something like that.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on May 16, 2018, 23:25:18
That was a lot of metal in there. What's the parts scene like on these motors?
Just curious if you're to the point where this becomes a parts bike for another one, or if it's really worth rebuilding what you have.
Doesn't their 250 motor fit it or parts compatible?  I thought my buddy mentioned something like that.
Not sure I'm ready to give up yet. Entire engine swaps are pretty tricky due to the extreme offset on the countershaft sprocket. There is actually an outer carrier bearing that is part of the sprocket cover. Even a bw350 motor utilized a jack shaft on the swinger, so its not a real easy swap at that. Heads, however are a little easier to come by. I don't have the list handy, but a number of tt225 xt225 xt200 and a few others are direct swaps, and can be had complete with cams, valves and rockers for around $70 used.

That said, if I find a complete better tw200 for a reasonable price, this one will quickly become a parts mule.

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Brodie on May 18, 2018, 16:39:37
That engine looks a hell of a lot like a sr250 so that might be an option as well.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on May 18, 2018, 17:00:13
That engine looks a hell of a lot like a sr250 so that might be an option as well.
They say the sr185 head will work, but no mention of the sr250

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: Brodie on May 18, 2018, 17:05:12
Fair enough. I have a spare sr250 cylinder I can measure if you need.
Title: Re: Yamaha TW200.. the swamp donkey
Post by: Hurco550 on May 18, 2018, 17:12:16
Fair enough. I have a spare sr250 cylinder I can measure if you need.
I may take you up on that! Much thanks!

Sent from my SM-G920V using Tapatalk

Title: Re: Yamaha TW200.. the swamp donkey
Post by: der_nanno on May 19, 2018, 04:13:39
Do you have the ID and OD of that bushing? I mean it doesn't look too bad and throwing a ball-bearing in, shouldn't be the end of the world or have I missed out on another failure?