Bigger carb, Kehein or Mikuni flatside?

[kilabeez0]

I was just wondering on how to upgrade a carb. Since I'm restoring I'm considering it. My stock carb is 24mm on my 200x. Is a 28mm carb a big enough upgrade? And what is the difference between a Mikuni flatside or a regular larger Kehein. Only other mods will be a UNI filter and DG Krome exhaust.

[Dynofox]

From my snowmobile experience I’d go with the flat slide mike over the kehein. I had a 99 xc 700 that had kehein 39mm's on it and I wasn't as happy with them as my newer sleds with the 40mm flat slide mikuni's. The flat slides seem to have better throttle response.

[samster143]

I tried to put a 28mm flatslide on my 200x, and it just would not fit. I chose to use a 26mm mukini round slide that was modified to 27.7mm. I used a mukini intake boot (60mm size) worked on it for about 2 hours with a dremel. With a small shoehorn it fits well. i use a k&n filter right on the carb with an outerware. The performance is tremendously improved. I would recomend this to anyone who is looking for more power and has a little time to get things set up right. I think I am getting this performance due to other mods (cam, porting, 10.25:1 piston, and pipe) the larger carb brings it all together!

[bigred110]

I have 175 tri-moto and I don't have the carb for it. I don't want to spend $160 from parts fish and I don't want to get a VM18 for $60 (because of the size). What will be a good size for it, well a 22 be good for it. It's a 2 cycle and I'm not planing on making any performance mods right now but maybe in the furture I might. The orignal is a mikuni VM20. It's a clamp on. I've only been able to find a 20 bolt on.

[MR ATC]

4 stroke motors do not respond well to flat side carbs. mikuni or keihin.
keihin carbs are stock on most Honda's and seem to work better then there mikuni counterpart. for the 200X with the mods you listed a 26mm keihin PE carb would be the best.