how do you what millimeter youre carb is?
you measure the opening right?

 

You measure the diameter of the hole nearest to the slide. Sometimes the holes on the outside are much bigger.

 

i knew you would have the answer you always seem to lol

 

hell its a 41 mm is that to big. am i gonna lose any of the lowend grunt?

 

That's the goal! [img]i/expressions/face-icon-small-tongue.gif[/img]

 

<div class="FTQUOTE"><begin quote>Originally posted by: nimbh2

hell its a 41 mm is that to big. am i gonna lose any of the lowend grunt?</end quote></div>

What's a 41mm???

 

41mm fcr carb

 

Air travels faster thru a smaller hole. When you're at low rpms, you need the air to be traveling fast to fill the cylinder well enough for the lowend grunt. If the carb is too big, you could see a drop in lowend. But if the carb is too small, you'll see a drop in topend. So, looks like the carb size just pushes the HP curve around the rpm band.

 

if does couldnt i just put a 13 tooth sprocket to make up for it

 

<div class="FTQUOTE"><begin quote>Originally posted by: nimbh2

41mm fcr carb</end quote></div>

Huh... Didn't know they had 41's in the fcr.

Sizing carbs for small engines is a guessing game. If we're talking about a z400 that came with the 36mm and you're planning to use a 41mm with no porting or cam changes... I think that may be a bit on the big side. Especially if your using a foam filter (slows the air down).