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I just picked up a 08 TW200 yesterday with only 120 miles, I love the thing but was hoping to squeeze a few extra HP out of it. Any ideas? does the exhaust help or is it just added noise mostly?
 

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I finally found a TW locally that was a good deal. I too would like to know what is recommended for extra power, without sacrificing reliability and too much fuel economy. My bike has had work done to it, including a 225 head/piston, K&N filter (cut up airbox), and 250 Ninja muffler. I had just begun to research the modifications when I found this forum. I would love to hear opinions on whether or not these things are harmful to the engine or even worth the extra noise that the different muffler makes. Any input would be great. Thanks.
 

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Are you looking for more top end speed? = Smaller rear sprocket or bigger front sprocket (Stock is 14/50)



Are you looking for more low end grunt? = Bigger rear sprocket or smaller front sprocket



Check Out Sprocket Calculator



A FMF pipe will give you a slight speed boost downhill but the change in torque curve will hurt you going balls out uphill.





A little bit of overall increase? = Carb jet change and needle shimming



Biggest mod I could do for my bikes performance is if I went on a diet and lost 30lbs
 

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Well, stock sprockets, mine seems to wind out at 63 mph/107kph and gets between 62-90 mpg depending on speed/winds. So, with your bigger displacement/loud pipe etc, do you see a difference? I'd love to hear if it gains any mph or loes a lot of mpg compared to my stock setup.
 

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I finally found a TW locally that was a good deal. I too would like to know what is recommended for extra power, without sacrificing reliability and too much fuel economy. My bike has had work done to it, including a 225 head/piston, K&N filter (cut up airbox), and 250 Ninja muffler. I had just begun to research the modifications when I found this forum. I would love to hear opinions on whether or not these things are harmful to the engine or even worth the extra noise that the different muffler makes. Any input would be great. Thanks.




I'd start with the carb. See if it's been messed with at all. Look for a larger main jet, and see if the needle has been shimmed via small washers. Any muffler for these bikes, will yield very little in the way of power. Even with carb work, they seem to boost the midrange and upper range, mainly the upper range(6K RPM's and up). It's up to you to decide if it's worth the noise or not. If the carb has been tuned properly, no harm will come to the engine. If the carb is still stock, then it's most likely running FAR too lean, and that will cause problems in short order. And once you richen up the carb, you will lose MPG. How much MPG will you lose is tough to say. Too many variable, like riding conditions and the tune itself.
 

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I should have explained more about my carb. I has been "worked on". There are about 4 washers on the main needle and the main jet is a #135. I found a crack in the intake boot immediately and am getting that replace so that might have been the reason for such a large main. The bike starts up immediately even when cold and idles great. I just want to make sure I'm not ruining the bike with the mods that are on it (exhaust, K&N). I have ridden it back and forth to work for a couple days and the thing goes great. In fact I ride it between 55-60 mph but figured I'd see what it could do and I backed off when I hit 70! That seemed crazy for this bike after everything I've read from other owners.



If the K&N is a "safe" mod, what exactly do you do with the airbox? Do you eliminate it or just cut it to shreds? Mine has been really cut up, but the filter doesn't quite fit square. Just wondering. Thanks for all the advice.
 

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With 15-47 sprockets my otherwise bone stock '90 does 70MPH indicated easy. From what I've read most of the exhaust mods are just eye candy and some like the noise better.
 

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My modified exhaust (as seen in avatar) replaces the stock spark arrestor. It is made from sweated copper plumbing fittings and a stainless steel mesh screen tip. With the screen tip on it is real close to the stock sound and produces a little stronger air flow. With the tip removed it is a little louder and produces much more air flow. Only carb changes made was 2.5 turns out on the needle. Plug looks fine. I also replaced the stock mounting screw by anti-seezed allen bolt. This works fine for my riding 3500' to 5000'.
 

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After break in I had a surge of power .Not much but noticeable. Still could use 50cc and a extra gear but then it wouldn't be priced like a TW.
 

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Sebastian can source a stroker crank and bore kit, up to 300cc. Requires boring the case and head. TTR 6-speed trans and clutch can be fitted on a modified TW countershaft. Big bore 250cc TTR engine from xr100.com complete from carb to exhaust can be had. you must provide the engine to the builder for mods, then refit the TTR parts with the modded TW countershaft, then stuff it all in the TW cases. That'll about double your horsepower, and kill your reliability.
 

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Sebastian can source a stroker crank and bore kit, up to 300cc. Requires boring the case and head. TTR 6-speed trans and clutch can be fitted on a modified TW countershaft. Big bore 250cc TTR engine from xr100.com complete from carb to exhaust can be had. you must provide the engine to the builder for mods, then refit the TTR parts with the modded TW countershaft, then stuff it all in the TW cases. That'll about double your horsepower, and kill your reliability.


+1 on the down side to the "pumping up" to a super powered engine. Reliability go's out the door. I ran into this with guys building "race guns" wondering why the tack driver just doesn't feed all the latest "cool" self defense ammo. The TW is one tough little cookie, that will run like a top, stock or with minor mods. Not to say it can't made into a racer but at what cost... Race equipment gets finicky when tuned for a specific purpose. To increase reliability a certain amount of de-tuning occurs to get an overall/general performance gain. I think the TW falls within this window and can be bumped up for street or dirt specific uses but is at its overall best performance "as is". My kudos to Yamaha engineers. ...maybe that's why this model has been around so long... Ask a drag racer why they rebuild the engine after each race...sometimes even between runs...

John
 

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Hi and congrats on the new bike. These little bikes are great and a real ball of fun to ride, but as for power and speed...well that wasnt in their design. I have an 09 and once broke in, felt the highway speed was just alittle lacking, so i did a sprocket and chain upgrade and ended up pleasantly surprised with the outcome. Just going from stock to 47T rear made the bike come alive, lot lower rpm on the flats but still lots of grunt on the trails. The chain is quieter and has smoother shifts as it doesnt stretch like the stock chain did, every trip it needed adjusting. This does nothing for more power, but when i purchased the bike i knew i wasnt going to set a new land speed record. The only way this bike will clear 100 mph is if you ride it over a cliff. I would recommend just enjoying it for its original design, an awesome trail machine! I have out-rode two stroke smokers and an XT350 on the trail, but they left me in the dust on the road, small price to pay for a great day riding.

So just enjoy it and the fuel mileage it gets, the great grip on the slopes and the fun of just knowing you have a head turning machine.
 
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Hi and congrats on the new bike. These little bikes are great and a real ball of fun to ride, but as for power and speed...well that wasnt in their design. I have an 09 and once broke in, felt the highway speed was just alittle lacking, so i did a sprocket and chain upgrade and ended up pleasantly surprised with the outcome. Just going from stock to 47T rear made the bike come alive, lot lower rpm on the flats but still lots of grunt on the trails. The chain is quieter and has smoother shifts as it doesnt stretch like the stock chain did, every trip it needed adjusting. This does nothing for more power, but when i purchased the bike i knew i wasnt going to set a new land speed record. The only way this bike will clear 100 mph is if you ride it over a cliff. I would recommend just enjoying it for its original design, an awesome trail machine! I have out-rode two stroke smokers and an XT350 on the trail, but they left me in the dust on the road, small price to pay for a great day riding.

So just enjoy it and the fuel mileage it gets, the great grip on the slopes and the fun of just knowing you have a head turning machine.


With your 47 tooth sprocket change, did you need to go to a shorter chain? I am in need of a new chain and would like to drop the rpms some on road.

Thanks !
 

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If your chain is worn, both sprockets are also worn. The Yamaha rear wheel sprocket is a quality part. Spend a little extra on a 15 tooth countershaft sprocket. That will have about the same effect as a 47 tooth rear wheel sprocket and last longer. O-ring chains mean less maintaining and more riding. A lot less and a lot more. Definately worth the money.
 

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If your chain is worn, both sprockets are also worn. The Yamaha rear wheel sprocket is a quality part. Spend a little extra on a 15 tooth countershaft sprocket. That will have about the same effect as a 47 tooth rear wheel sprocket and last longer. O-ring chains mean less maintaining and more riding. A lot less and a lot more. Definately worth the money.


But am I going to have to change chain sizes? When I bought it, it is adjusted all the way to the max to allow for the stretch (my honda is shaft drive and I didn't have the Kawasaki long enough to adjust chain or replace it)



Basically, I want to be able to cruise at 60 on occasion but I'd like to have the low end grunt to maybe pull the front wheel off the ground easily in 2nd.



15/55 puts me at 78xx rpm at 60 but still gives me some low end grunt. 14/55 seems nice and torquey, but puts me close to redline at 60. I think I might go 14/55. My main question though is chain size.. 14/55 seems like I'd have to go longer a few links, but not sure how long.



This is what I have on my wishlist:



173465

Sunstar - 428 Front Countershaft Sprocket

Size - 15

SKU#173465

Available - Usually leaves our warehouse in 1 business day(s).

$14.99

You save

$0.96

Update QuantityUpdate

RemoveRemove

$14.99



45061

DID - 428 Standard Roller Chain

Size - 130

SKU#45061

Available - Usually leaves our warehouse in 1 business day(s).

$35.99

You save

$3.96

Update QuantityUpdate

RemoveRemove

$35.99



234710

JT - 428 Steel Rear Sprocket

Color - Steel, Size - 55

SKU#234710
 

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Don't know who posted it, but someone asked if anyone had any specs on 0-60 mph for the T-Dub. The reply was 10-12 seconds for a stock bike and measured with a CALENDAR ! Despite all the money you may pour into this beast, you'll not change this spec significantly. My stock '10 cruises on a flat road at 60 mph @ 7000 rpm. I've seen 68 mph at times in cruise. Vibration sets in around 53 mph so that's where I generally ride. I might be interested in a 47T rear sprocket, but my hills in PA may prohibit that mod. And by the way, at my normal driving I'm getting 83 mpg!
 

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Don't know who posted it, but someone asked if anyone had any specs on 0-60 mph for the T-Dub. The reply was 10-12 seconds for a stock bike and measured with a CALENDAR ! Despite all the money you may pour into this beast, you'll not change this spec significantly. My stock '10 cruises on a flat road at 60 mph @ 7000 rpm. I've seen 68 mph at times in cruise. Vibration sets in around 53 mph so that's where I generally ride. I might be interested in a 47T rear sprocket, but my hills in PA may prohibit that mod. And by the way, at my normal driving I'm getting 83 mpg!


Hello,

I have an '08 and upgraded by one tooth on the front. Most of my riding is on the road and I still only get around 58-62 mpg. What type of mileage are you getting on your TW at higher speeds?



Thanks
 

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Has anyone else seen the.........



Yamaha TW200 TW 200 Mini Nitrous Kit w/5 NOS Refills ?








http://www.dragtimes...0176670010.html



Kit includes:​

1 - Nitrous Oxide Trigger System w/ Saftey Lockout​

1 - High Pressure DOT Approved Air Line w/ Fittings​

5 -Large & 5 Small Nylon Zipties​

2 -Adhesive Ziptie Mounting Bases​

5 - 16 gram Hole Shot Nitrous Refills​

1- 8 Gram Nitrous Tank Adapter​

and Installation Instructions.




Free Dual Line Adapter with the purchase of two kits.​

This will allow you to run two kits on the same machine.​

TWICE THE NITROUS!





















 

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Save all the big pieces




Re: Aftermarket exhausts:



If you have ever cut a stock exhaust open, you'll find that the TW,TTR225 and XT225 exhausts are virtually IDENTICAL internally. I have a sneakin suspicion that holds true for the 250's as well, but haven't verified that.



4 exhausts gave their lives for this research when Ronniedog and I unbeknownst to each other got curious and cut them open. We both concluded the same thing: It's simple as a brick (possibly the simplest I've ever seen), quiet as a mouse and flows more than a TW head ever will, as is.



Unless you wanna save weight, look cool or just like the low rumble, the stock exhaust can handle any typical mod. Anything beyond that can be handled either by modding your end cap BillMichaels style or upstream in the nosecone, for the price of a drill bit.



Just sayin'. I'll post pics of the guts later so you can judge for yourself.
 
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