45mm kiethin on an 81 250r!?!?!

[Deathrocket]

K folks... almost got my 250r air cooled trike back together and one thing is the intake boot is torn.. I now know why.. someone managed to shoehorn a 45mm keithin on the stock intake boot. 10mm over sized sounds like WAAAAAY to big of a carb on this motor, it was running great before the piston circlip let go but still is that way too much carb?

[oscarmayer]

if she ran fine, runn it! get a bigger intake boot for it and have at it! on ym 200x stock had a 24mm carb, I now have a 30mm carb and it loves it! slam the throttle and hold on tight cause it's one harry ride!!

[cr480r]

You sure it's 45mm?

[Deathrocket]

with my cheap chinese wanabe caliper gauge, thats what it is.... guess 44mm is as big as they go.....

[barrett8]

first gen 250r came stock with 27mm carbs

[oscarmayer]

you sure it's a stocker setup? maybe they ported it and used a bigger piston or higher compression one?

[Billy Golightly]

You must be measuring on the airfilter side of the carb and not where it goes into the intake.

[Daddio]

You are measuring the wrong part of the carb. It's hard enough to fit a 39mm carb on one. :rolleyes: Got any pics? :pics:
By the way, unless it's a highly modified engine, a 36mm is about all you need.:welcome:

[pcs]

def would not run well with a 44mm carb, that is what zilla guys use on drag ported engine with twice the motor.