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Discussion Starter #1
OK ... so I'm looking for an "interesting bike" and I spot this 2008 TW200 for sale. It was advertised as a Custom 2008 Yamaha.




I go and check it out and I like it. I take it for a ride and decide to buy it!







This is what it looked like when the po/builder decided to transplant a freshly rebuilt 2003 YZ250F engine.




He manufactured his own frame sections to accommodate the new power plant.
I think he did a pretty dam good job




z
 

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Discussion Starter #2
I have a notion to do something like this to it..








The tank is a 5 gallon Harley Fatboy tank, looks reasonably easy to modify for my purposes. The seat is .. I believe the rear seat from a suzuki cruiser style bike. I'm open to options for a seat tho... but funds are a bit restricted just now.



z
 

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Discussion Starter #3
I have a kickstart lever coming for the bike. The one that was provided with the bike was home made.. and to be honest it SUCKS! The factory one that I have coming will need to be modified to clear frame sections.. but it's do-able. I have a 6 inch 12 volt "Spall" pusher fan coming to help out the radiator in case of overheats, that rad is a lot further away from the water pump than was intended by Yamaha's design team.



z
 

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Discussion Starter #4
I answered another thread on lowered seating position and got some good info from lizrdbrth and Flingwing. I don't want to thread poach the other thread so I'm gonna re-open the topic here.





I'm curious... what would be the result on handling if the rear was lowered through the extra hole method and the forks left where they are from the factory? I suspect this would make the front wheel "less inclined" to turn? Kinda like the choppers of yesteryear..? I ask because my bike has a fair bit "more power to the ground" than most of your bikes... as a result the front end can get out of hand at speed... kinda "twitchy" if you know what I mean. I'm thinking that by lowering the rear and not the front this will induce more "rake" in the front end.



Any thoughts?



z
 

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Rockin'.



I partucularly like that you're taking it in your own direction.
 

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Discussion Starter #6
lizrdbrth gave this answer and I'm gonna address them one by one the best I can




"Your situarion is a bit unique. It might pay you to get your hands on a stock TW and ride it to get feel for whether what you consider "twitchiness" is normal, the result of nearly twice the horsepower or caused by mechanical issues.



"Twitchy" being subjective, TW's are twitchy. A bit oversprung in the rear, and a 52 inch wheelbase is a 52 inch wheelbase. Add enough power to easily loft a front wheel and those alone could cause what you describe as "twitchiness". Just for comparison, the bike your motor came out of has 6 more inches of wheelbase. A hyperextended swingarm will put more weight on the front end.



If the excess power is causing thr front end to lighten up lowering the rear may make things worse. Under power even more weight may be transfered rearward. Think "60's Gasser".



But lowering the rear or lifting the front will definitely slow down the steering. Drnlling the swingarm shock pivot is a reversible mod. Just don't get carried away because a 3/4" difference does not equal 3/4" of lowering, but more on the order of 3".



The other option is lifting the front. YZ80 fork tubes will allow a little over 2" more height.



Proper fork oil level will help keep the forks from unloading as easily. Or at least more predictably. A few less teeth on the rear sprocket might dumb down the tendency, as well.



If you mean "twitchy" at a given speed (like a high speed wobble) that indicates a mechanical issue.



High speed wobble indicates loose or worn steering bearings or swingarm bushings, misaligned tires due to uneven snail adjusters or front ubes twisted in the triples, tire balance, wheel bearings, low or high fork oil, etc.



Your bike has a fair amount more power. If it's worn swingarm bushings every time you twist on it your bike will tend to react more violently than a stocker, even at relatively low speeds. The swingarm will cock sideways under torque. When you back out of it or clutch to shift gears it will unload and cock the other way. Tail wagging the dog.





Your bike has had a fair amount of frame modification. While it looks great and appears to have been done properly there's always the possibilty that the frame has a bit of misalignment. If you can't cure the twitchiness through handling adjustments I'd take a more critical look into that possibility. Even one degree from vertical on the steering head will give you issues you'll never sort out.



Have you ever ridden a stock TW?"





I'll do my best to answer here.



#1 yes I think a longer swingarm will help a lot. I'm speaking with Trickstr about his extended swinger.



#2 yes I think this is a direct result of added power, at speed it settles down somewhat.. under hard acceleration it gets a little squirrly



#3 I will look into drilling a new lower shock mount hole, this is reversible easily.. I like that idea



#4 I'm looking into another set of forks right now
(does anyone know the length of inverted KX100 forks?)



#5 ya know... I counted the teeth on my sprocket and I'll be damned if I can remember how many (raining now.. will check later)



#6 the po/builder was meticulous with this build, ALL bearings and "wearable" items were replaced with new, as mentioned the problem shows up under hard power and settles down once you back off a little and aren't actively accelerating.



#7 nope, I've never ridden a stock TW




z
 

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Be careful choosing the USD forks. Those fatbobs may limit your options.



I've never looked but a KX100 probably has better brakes
 

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Discussion Starter #9

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Discussion Starter #10
Be careful choosing the USD forks. Those fatbobs may limit your options.



I've never looked but a KX100 probably has better brakes


Yes I agree 100% I'm not decided on the tank yet, I'd rather sort out the swinger and forks first then see how I like it before I decide on what direction to take with the tank. I'm not set on one look or another.. but I do like the harley tank.. although it is already showing that I'll have to re-do the fork stops as it sits.



The inverted lx 100 forks apparently come with triples (top is a protaper) and (bottom is stock) and protaper fatbars . I'm not shy about pressing in/out a steering stem, I need to get into the stem head bearing chart and see how far apart they are in specs.



z
 

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Awesome bike! Just in case you are not aware, check the specs for oil change frequency. Most guys with those motors are full synthetic with 500 miles Max oil change interval to maintian the upper end. Many change the oil after each use or every other use--sounds crazy to us TW guys.



Dusty
 

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Yep. Oil change interval is ten hours. Twice the horsepower, same amount of oil.
 

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Discussion Starter #13
Thanks dustyg I like it a lot. Yes I've been looking into the yz engine and for sure it is more maintenance intensive than a stock TW by a long long way. If there was a longer service interval engine that would bolt in as the bike is currently built I'd look into getting it.



z
 

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Thanks dustyg I like it a lot. Yes I've been looking into the yz engine and for sure it is more maintenance intensive than a stock TW by a long long way. If there was a longer service interval engine that would bolt in as the bike is currently built I'd look into getting it.



z


I don't know about bolting in... but a WR250R motor would sure be sweet! Electric start, huge service intervals, fuel injection, six speeds, shall I continue??? LOL.. In my opinion, that would be the perfect TW motor... If only money grew on trees.... The new XT250 engine would great too!



I'm sure most of us will just stick to mod'n our 'lil stock motors a bit. But, that doesn't mean we don't enjoy seeing bikes like yours!!
 

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Discussion Starter #15
I don't know about bolting in... but a WR250R motor would sure be sweet! Electric start, huge service intervals, fuel injection, six speeds, shall I continue??? LOL.. In my opinion, that would be the perfect TW motor... If only money grew on trees.... The new XT250 engine would great too!



I'm sure most of us will just stick to mod'n our 'lil stock motors a bit. But, that doesn't mean we don't enjoy seeing bikes like yours!!


Hey Yamaha... are you listening???



z



ps: too dam true!
 

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Discussion Starter #17
Awesome bike mate. Inspiring, really makes me want to start looking for a YZ/WR250f engine, but my wife would go bonkers lol.


Thank you, I can't take credit for the build tho. I bought the bike as it sits. I'm putting an extended swing arm on her for next year and possibly some improved forks but haven't settled on a set of forks for the upgrade yet. IF you are going to upgrade the engine I would highly suggest the WR over the YZ as the WR has a real charging system.



z
 
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