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
Michael,
The whole idea of the diphragm carb is that it will work in most
positions.
One thing to concern ourselves with, these carbs tend to be somwhat
crude
on mixture control. The latest ones probably work better. I haven't
used one
in about 15 years!
Bill Jepson
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