How To Set Your Motorcycle Carburetor Float Level (more commentary).

[RMer98]

hey faded awesome explanation
but i have a question? is that a pwk keihin and if so what is the float measurement for this carby and also does jetting have anything to do wit float level adjustment

[Faded]

Originally Posted by RMer98

is that a pwk keihin

Yes, 38mm AirStriker.

Originally Posted by RMer98

if so what is the float measurement for this carby

16mm.

Originally Posted by RMer98

does jetting have anything to do wit float level adjustment

The float level has everything to do with jetting. The first post of this thread explains how it affects all jetting circuits and the importance of setting the float level first.

[ossagp1]

The float level has so much to do with the overall fuel air mix (jetting if you wish to call it that), that it is the way lots of dyno tuners experiment with different fuel air mixes. They do it by simply varying the float level by having the vents hooked up to a vacuum source. It is used on various things such as snow machines to compensate for temperature and altitude, again by varying the pressure in the float bowl itself.

But I still love it when someone who feels they know better look at me and just say "the size of the jet determines how much fuel gets into the air stream". To rip off Paul Harvey, now you know the rest of the story.

[dodge]

So whats the measure ment for a 93 kx 250 i would look it up but i dont have a manual yet

[Shoei_391]

Wow this is awesome. It doesnt seem all that hard any more. I kinda know what floats do but what do like the float assembly tang and the fuel inlet needle do?? AWESOME write-up Faded

[82'yz100]

do now how to do the same to a 82'yz100 cause its way diffrent.thanks

[kylehereygers]

Originally Posted by Faded

T,

This one is free.

Lmao of course its free f it wasnt he wouldnt have put it up lol..but thanks man for it helped me out alot

[cddj77]

ok faded.. I'm brand new to fixing bikes. Took the carb off a 95 cr 250 to "grasp an understanding" of it.. Wish I would have been pointed in your direction sooner. The bike was running fine and when we put it back together... It will only start if you clean the plug every time and it only stays started for about 3-8 seconds before it "boggs out". The spark plug is wet and has unburnt fuel on it. The main question is, if you take the float and everything off the carb.. when you put it back on do you have to reset it. Could the float be causing this "flooding/ bogging out" problem. Thanks For the sick breakdown of the carb and float adjustment. I seriously was looking for a "dirtbikes for dummies" at the store. If you know that much about the rest of the bike you could write a sick "general knowledge" book. I personally would pay good money for one. If you know of one already out there .. let me know
craig

[blake_vail]

Wow,what can i say great write up faded, now i have a better understanding of the float level, but would you know by chance the float level measurment for a 2002 CR250R, dont have a manual and by the way i would buy a book as cddj77 was saying of general knowledge +2

[cddj77]

I don't know for a 2002. you could call your local dealer and they might give you the specs. If not.. you could always go "peak" at a clymers manual at a shop or bookstore. you could get a manual off ebay for 15-30$$ It was a great help to me.

[oscar1]

Thanks Faded, Just asked the question today and found your thread. Biggest help since I purchased the bike.

[krazymarks-cr]

Originally Posted by Faded

Any time, hopefully this will clear up some of the confusion and get everybody on the right track.

nice 1 faded been scratching my head for days thinking where do you measure float hight from your the dogs b@@$$cks thanks MARK CR250

[Jopiz]

Nice writeup!

I set my float so its paraller to the gasket surface. The measurement is 15mm. Should i set it to 16mm. It gets a little off paraller. I noticed my float tang had a little hole where the needle valve sits on. Could it affect the measurement or is it normal to have that kind of "hole".

My carb is 35 PWK

-J

[f4stunter]

Originally Posted by krazymarks-cr

nice 1 faded been scratching my head for days thinking where do you measure float hight from your the dogs b@@$$cks thanks MARK CR250

Me too. I know this is an old thread but it helped alot. I cant believe the FSM didnt even have a picture like most. just 2 sentences which are vague at best.