Keihin vs Mikuni

[Triker]

I have always used Keihin carbs on my 250Rs but was wondering how the Mikuni flat-side carbs performed compared to the Keihins. Can anyone tell me the difference in how a Mikuni flat-side would make my R run. I remember in every magazine article where the Mikuni was used in a performance upgrade, the throttle response was always great, which is what I am after. I could care less about wide open only performance.

Thanks in advance

[86waterpumper]

I've heard the lectrons are the best power wise, and they certainly look cool but the jets cost more. As far as a mikuni goes, I've never ridden on one that was properly jetted, but I doubt it would have more response than a pwk airstryker....

[Merriman]

Well.....I just picked up a mikuni TM 38 flatslide carb from a friend. (he gave it to me for free) so I ordered the V-force delta reeds also. I've never used one, but when he had it on his bike it hauled, and it was very responsive. I'll be putting it on this weekend, trying to jet it, and getting running in time for Thanksgiving out at Gordon's well sand dunes. The problem I have is that I live at 5000 feet, and the dunes are sea level. So I'll have to do my fine tuning out there. But I'll let you know what I think when I return.

[86waterpumper]

cool tell us how it does merriman, a 38 carb is going to haul anyhow compared to a 34 no matter what kind it is, I would be interested to hear from someone that has run both mikuni's and keihins of comparible sizes...

[ATCRYDER]

Ive never used anything but Kehinns in my offroad vehicles (that I know of) so i really cant say.......Kehinn is obviosuly more popular as theyre stock carbs on about everything...

[Merriman]

Well I can tell you this much to start. Installing it sucked. First I had to change out my throttle cable with my old Kiehin one, mix match the parts to get it to work. Then the manifold side of the carb was to barely to big to fit the rubber manifold going to the reeds, So I had to lube it up and squeeze it on there like it was giving birth. I installed the new V-Force reeds and then had to wedge the carbuetor and manifold in that little spot as one whole unit to make it work. That was the easy part. it got down to time to connect the air tube to the other side of the carb, and the carbs inlet was way to big to squeeze it on. After some quick shaving of the inside and more lube it took me and my large friend to suck that air tube into place.
All I got to say is this carb had better be worth it. All in all it took me about 3 hours to put the intake track together.

[Mobular]

The next time you have to force an oversized carb into a rubber manifold, try dipping the rubber end into some really hot water. That'll soften things up and make it go much easier!

[dunerash]

I run a 39mm pwk on mine...First time I lined it up, I didnt think it would fit...we used hot water and plenty of "lube".. I did it the same way..Put carb on the manifold and put it in as one unit. You will notice a performance increase..:)

[macanic]

carbs .....
the only way is keihn
if you own a mikuni pick it up a throw it as far
as you can....
its nothing more than a beer can with a throttle
i have had nothing but problems
put a new 39mm on my 250r
42 pilot 168 main
just runs great!!!!!!
i run a 39mm on my tecate
48 pilot 170 main
runs great!!!!

stick with the best... KEIHN

3 wheels rule!!!!!!!