How do I know what size Mikuni carb I have?
Re: Identifying Mikuni carb size? Measure the inside diameter of the carb on the engine side. That will give you the size. Most of the internals will be marked as to what size they are and a lot of them can be ordered separately as needed.
Where is the model number on a Mikuni carb?
Look at the top view of the float chamber cover, the cover gasket of the float chamber or the jet chamber cover gasket to identify a Mikuni Carburetor. There is a word that should be printed on the car. It can be in small or large letters.
How do I know what size carburetor I have?
The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency รท 3456. Any ordinary stock engine will have a volumetric efficiency of about 80%.
How do I know what size carb I need?
As you are looking through the bore of the carb, the carb size equals the the diameter of the bore measured in millimeters (25.4mm/inch) at a location roughly where the slide is located. For example if the bore diameter was one inch, that would indicate a 25.4mm carb.
Are Mikuni carbs good?
The Mikuni VM was a great carb for 2 strokes and was easy to jet and ran well. The TMX and TMXX are finicky and not good. I had always thought of the Kehin carb as a 4 stroke carb (owned by Honda). The PWK and PWK Airstriker seem to be very good carbs.
Do carb spacers add horsepower?
On the 350, best results were found with a 2-inch spacer. Its use produced up to 6 more horsepower at peak and as much as 14 more at 750 rpm over peak power. On the 400-inch engine, a stack of three 1-inch spacers produced the best results.
Is a 600 cfm carb too big for a 305?
500 or 600 is fine for a 305.
Can a carburetor be too big?
According to all of the carb charts you are too big for a street engine. The race 289 used a 715 cfm Holley. You would need a lot of rpms to really need a 750. Throttle response and smoothness of acceleration are some of the problems with too big a carb.