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Discussion Starter #1
As many of you know, I have been fighting the idea that you can't power-wheelie a tw. So.... I picked up a 55t sprocket and was thinking maybe a new exhaust and re-jet with airbox mods might wake the little beasty up. I know that the exhaust wont do much but if it helps at all i'm willing to go ahead and pick one up. A dg is $160 on ebay.
 

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I'm going to try a DG myself. I'm going to see how much I can squeeze out of the stock exhaust first with jetting. When I put the TM28 carb on for some testing it sure seemed to make the front end lighter. The flat slide carb just seemed to "spool up" quicker. I'm hoping that combining the TM28 and aftermarket exhaust will give mine so more pep! I'd say go for it!!
 

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As many of you know, I have been fighting the idea that you can't power-wheelie a tw. So.... I picked up a 55t sprocket and was thinking maybe a new exhaust and re-jet with airbox mods might wake the little beasty up. I know that the exhaust wont do much but if it helps at all i'm willing to go ahead and pick one up. A dg is $160 on ebay.




Best pipe I have heard so far is bikerjosh, he has the Big Gun and it sounded very dual sport, not to loud but throaty.





Ronnydog
 

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Discussion Starter #4
I'm going to try a DG myself. I'm going to see how much I can squeeze out of the stock exhaust first with jetting. When I put the TM28 carb on for some testing it sure seemed to make the front end lighter. The flat slide carb just seemed to "spool up" quicker. I'm hoping that combining the TM28 and aftermarket exhaust will give mine so more pep! I'd say go for it!!


I have played with jets and nothing gets me where I want it. Is the tm28 a push/pull carb? I will see what kind of prices I can get for the carb and exhaust from work tomorrow. I wish someone made a full exhaust for the tw. Airbox mod, flat slide carb and exhaust... we shall see.
 

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Discussion Starter #5
*I can pick up a TM28 for $110 from work. Are there any other carbs out there that I should look into or should I just go ahead and order this one?

*My cost for a DG is $157 for an "o" or "r" series but the "o" won't be available til late January. I'm thinking that I would rather wait til I can get the "o" series. TW200 DG exhausts

*The FMF would be $212.
 

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Discussion Starter #6
I'm going to take LB at his word and avoid buying an aftermarket exhaust if all it really does is make it louder. I am still going to order the flat-slide carb and see how that does. Can I use my push/pull cable or do I need a pull cable?
 

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Might be interesting what MrBracket's dyno runs reveal about carbs, cams, pipes, etc.



In the proper combination there may be some gains to be had. But I'm sticking to my story when it comes to otherwise stock TW's.
 

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Discussion Starter #8
Yeah i'm ready to see what an actual dyno will say about these. I may get an exhaust eventually but for now I am going to go with the carb. I don't want better top speed, just want to be able to get the wheel up while trail riding.
 

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Yeah i'm ready to see what an actual dyno will say about these. I may get an exhaust eventually but for now I am going to go with the carb. I don't want better top speed, just want to be able to get the wheel up while trail riding.




You my need to add some HP to easly get the wheel up.



Ronnydog
 

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I'm going to start on some carb testing soon, should be next week. I'm going to see on the dyno how much we can squeeze out of the stock carb first with jetting and exhaust. Also gonna pull off the side cover to see if the airbox is creating any kind of loss.



Then, I'll switch to the TM28 to see what kind of gains that will net with stock exhaust and aftermarket exhaust.



When I had the TM28 on there before, I just machined a little adapter to fit into the airbox side, the engine side fit into the stock rubber manifold. I used a whole different throttle tube and cable when I tested it the first time. The standard TM28 is not a push pull carb, just a single cable carb. We are going to build a custom cable we'll include in the whole carb kit that will fit in the stock TW200 throttle tube. You'll just run one cable instead of two. This of course assuming the TM28 is indeed a beter carb than stock. I'm betting it is, when I had it on mine it really felt like the flat slide made it take off quicker. The other thing about the TM28 is that the jets are much eaiser to get, and diffent needles are even availiable...



My "butt dyno" says the TM28 is a good mod, we shall see what the real dyno has to say.......
 

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Discussion Starter #11
What kind of adapter did you make? It looks like it would be a straight bolt-on. I'm guessing that it just needs a little more length to reach the air box boot?
 

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I'm going to start on some carb testing soon, should be next week. I'm going to see on the dyno how much we can squeeze out of the stock carb first with jetting and exhaust. Also gonna pull off the side cover to see if the airbox is creating any kind of loss.



Then, I'll switch to the TM28 to see what kind of gains that will net with stock exhaust and aftermarket exhaust.



When I had the TM28 on there before, I just machined a little adapter to fit into the airbox side, the engine side fit into the stock rubber manifold. I used a whole different throttle tube and cable when I tested it the first time. The standard TM28 is not a push pull carb, just a single cable carb. We are going to build a custom cable we'll include in the whole carb kit that will fit in the stock TW200 throttle tube. You'll just run one cable instead of two. This of course assuming the TM28 is indeed a beter carb than stock. I'm betting it is, when I had it on mine it really felt like the flat slide made it take off quicker. The other thing about the TM28 is that the jets are much eaiser to get, and diffent needles are even availiable...



My "butt dyno" says the TM28 is a good mod, we shall see what the real dyno has to say.......






Have you though about a 30 or 32mm? Ihe TTR225 intale will work with 30-32mm carb.





Ronnydog
 

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What kind of adapter did you make? It looks like it would be a straight bolt-on. I'm guessing that it just needs a little more length to reach the air box boot?
Yes, the TM28 is a little shorter from front to back than the stock carb.
 

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Have you though about a 30 or 32mm? Ihe TTR225 intale will work with 30-32mm carb.



Ronnydog


I've made the assumption (we all know what that gets you....) that because the hole in the TW200 head is only 28mm that a bigger carb wouldn't do much.. Of course I could be all washed up with that assumption. It may turn out that the carb and airbox are major constraints to the flow of air through the engine... Testing would be the only way to really find out, I enjoy theorizing, but at the end of the day I'm a quite empirical guy!!!
 

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Discussion Starter #15
I've made the assumption (we all know what that gets you....) that because the hole in the TW200 head is only 28mm that a bigger carb wouldn't do much.
This was my thinking as well. I guess I will have to do a little more research to see which one I should get.
 

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I've made the assumption (we all know what that gets you....) that because the hole in the TW200 head is only 28mm that a bigger carb wouldn't do much.. Of course I could be all washed up with that assumption. It may turn out that the carb and airbox are major constraints to the flow of air through the engine... Testing would be the only way to really find out, I enjoy theorizing, but at the end of the day I'm a quite empirical guy!!!




The TW head and the TTR 225 head are the same 28mm and people are running larger 32mm and 33mm carbs on them. I think the TW would benafit from a 30mm. Just thoughts. We need you empirical guys around.





Ronnydog
 

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I have run a big gun for about 2 years. Fits with slight mods better than stock. Had to repack it after a month or so, that cost another 80.00. At idle it is quiet, fmfs are a lot louder at idle, Big gun is a lot louder at wot than fmf. As far as power gain I didn't notice anything with the exhaust alone. Here is what I run, and yes very noticable gains, I can smoke the stock tw's off the line and hang almost exactly at top end, but if we accelerate together there is no catching me. Big gun ttr 225, wiseco high compression 1mm over, web cam tw grind, 42 pilot turned all the way in, 120 main with a very small shim on old style carb. Bike runs better than stock at all elevations and from about 50 to 90 degrees. But it took me 3 years of playing to get it there. Most noticable mod was webcam, did that last with some fine carb tuning and it all came together.
 

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No clutch needed. When I really get on it going from first to second the front wheel will come up with out effort. I bought the cam that webcam lists for the tw. Not sure what grind it is but that combined with the other mods is noticable to any of the guys that try my bike after riding theirs. I am happy... for now
 
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