I believe that type of carb is what is used on jetski
/waverunner/watercraft.
Mikuni brand, BM series.
see:
http://www.parkeryamaha.com/index.asp?PageAction=VIEWCATS&Category=333
http://www.parkeryamaha.com/index.asp?PageAction=VIEWPROD&ProdID=18207
 Detailed Description
High performance carburetors with extended throttle throttle shaft.
Features
a high performance tip needle valve to provide optimum pop-off and a
primer
type cold start system ( no butterfly choke) to increase air flow. Carb
Spec's. Low Speed 120. High Speed 150. Needle Valve 2.5. Spring Grams
80.
Primer kit required.

bunch of stock smaller ones on ebay

see ebay item #s:

120147388486 and
170136272480 and
260144907037

as an aside question I have been wondering about using a vacuum driven/
mechanical fuel pump as used on may snow machines and jest skis. some
put
out up to 35 liters per HAR.
like so:
http://www.parkeryamaha.com/index.asp?PageAction=VIEWPROD&ProdID=24324

Michael Silvius

Mikunis work differently. We have looked at those and the
principle is not as easy to implement. They having moving needles
valves
that are hard to implement with our p-port spacing. We have looked at
lot
of possible configurations over the years and the Tillotson is the best
I have
seen so far. Easy to make and cheap. There is no beating a venturi for
simplicity.

> Paul Lamar

Paul,
  The Mikuni in the link is a different carb than the standard Mikuni.
The Jet ski carb works like the Tillotson.
Bill Jepson

Additionally as far as I can figure they seem to be mounting them in different
orientations.
Keihin makes the diaphragm type for the jetskis as well. Mikuni makes them as
big as 46 mm
http://www.parkeryamaha.com/index.asp?PageAction=VIEWPROD&ProdID=18207

michael silvius


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