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Author Topic: Yamaha TW200.. the swamp donkey  (Read 9074 times)

Offline Hurco550

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Re: Yamaha TW200.. the swamp donkey
« Reply #20 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 ;)
« Last Edit: May 16, 2018, 13:13:01 by Hurco550 »
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline canyoncarver

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Re: Yamaha TW200.. the swamp donkey
« Reply #21 on: May 16, 2018, 17:05:22 »
That was a lot of metal in there. What's the parts scene like on these motors?
--
73' The Commando
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, more Nortons, a BSA, my 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline irk miller

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Re: Yamaha TW200.. the swamp donkey
« Reply #22 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.

Offline Brodie

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Re: Yamaha TW200.. the swamp donkey
« Reply #23 on: May 16, 2018, 18:56:51 »
I still say stick a bw350 engine in it...
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.


Offline farmer92

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Yamaha TW200.. the swamp donkey
« Reply #25 on: May 16, 2018, 19:10:59 »


I’d say he’s around the “at least it’s not more broken than when he started” point

Offline ridesolo

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Re: Yamaha TW200.. the swamp donkey
« Reply #26 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. 
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

These are on a low simmer out in the shop:
'75 Honda CL360: http://www.dotheton.com/forum/index.php?topic=56547.0
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline cbrianroll

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Re: Yamaha TW200.. the swamp donkey
« Reply #27 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.

Offline Hurco550

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Re: Yamaha TW200.. the swamp donkey
« Reply #28 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

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline Brodie

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Re: Yamaha TW200.. the swamp donkey
« Reply #29 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.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.