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Discussion Starter #1
Hello everyone! I don't have much experience with CV carbs, like the TK on my '08, so I'm a bit hesitant to fuss with it. There's lots of info on the CV carb here, though some confusion on what fits & how to shim this and that.



I'm more familiar with Keihin & Mikuni (non-CV) stuff, and those jets are readily available locally. Has anyone run Keihin PWK, FCR, Mikuni VM, TM flatslide or TM w/accel pump?



For what it's worth, this motor will see a new carb (or stock TK with rejet,) an aftermarket exhaust, a webcam 40a w/ springs & retainers, & probably not much more than that.



Thank you all in advance for your input!
 

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Hello everyone! I don't have much experience with CV carbs, like the TK on my '08, so I'm a bit hesitant to fuss with it. There's lots of info on the CV carb here, though some confusion on what fits & how to shim this and that.



I'm more familiar with Keihin & Mikuni (non-CV) stuff, and those jets are readily available locally. Has anyone run Keihin PWK, FCR, Mikuni VM, TM flatslide or TM w/accel pump?



For what it's worth, this motor will see a new carb (or stock TK with rejet,) an aftermarket exhaust, a webcam 40a w/ springs & retainers, & probably not much more than that.



Thank you all in advance for your input!
The Mikuni VM28-418 (flatsidecarb) fit's into the 2008 TW200.

But you will need a other thottle cable (one cable) and a throttle control for one cable.

-> throttle control like Domino 1815.03

-> throttle cable from the TW125 type 1 5EK-26311-01-00 (maybe avaiable in the US)
 

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Discussion Starter #3
Thank you for the fitment information! Was there a large gain in power using the VM28? Are the standard jets ok as a starting point for tuning?
 

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Modifying a cv carb is easy



http://tw200.forumotion.com/t152-tk-carb-main-jet-needle-spacing-change
 

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I know, that the VM28-418 will fit into the TW200 with brake disk, without any problem.

Bolt it on and finished. The measurements are nearly the same, like the org. carb.

Measurements from the VM28-418:

33mm - diameter intake side

44mm - diameter airbox side

82mm - complete length



And now from the TM33-12

40mm - diameter intake side (7mm bigger as VM28)

50mm - diameter airbox side (6mm bigger as VM28)

94mm - complete length (12mm longer as VM28)





And the next problem is the carb size.

A big carb dia is good for high rpm engines.

And a smaller carb is good for low and middle rpm engines.

A good working carb needs a minimum air speed and it does have a maximum air speed.

The minimum speed is not warranted, if you will use a big carb.

28mm -> 615mm² (cross section surface)

33mm -> 855mm² (cross section surface)

-> + 39% -> This is a big increase for a not performance tuned engine.
 

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The Mikuni VM28-418 (flatsidecarb) fit's into the 2008 TW200.

But you will need a other thottle cable (one cable) and a throttle control for one cable.

-> throttle control like Domino 1815.03

-> throttle cable from the TW125 type 1 5EK-26311-01-00 (maybe avaiable in the US)
Can you provide a baseline for jetting on this application?

Main Jet:
Pilot Jet:
Needle Jet:
Throttle Valve:
Jet Needle:
 
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