Mikuni Spring Color & Popoff Pop Off Chart

Shonuff

I've got the glow
Site Supporter
Location
Memphis
Mikuni-fig4.jpg


115 gram = gold spring
95 gram = dull silver spring
80 gram = black spring
65 gram = shiny silver spring

115 - Mikuni Reference Number 730-03030
95 - Mikuni Reference Number 730-03033
80 - Mikuni Reference Number 730-03027-T
65 - Mikuni Reference Number 730-03027

Huge props to Greenhulk's RX951
 

DAG

Yes, my balls tickled from that landing
Location
Charlotte, NC
I took me a like 10 pictures to get one in focus but here they are...

Left to Right: 115g, 95g, 80g, 65g

All Genuine Mikuni

Two notes... seems the 115g are not gold anymore.....
The 95g are wound backwards as stated before

Hope this helps....

Buy lots of springs! they never read what they should..... grrrr!

spring w/pic thanks to 2lick
 

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Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Indeed, it gets asked way too often.
I am tired of linking the manual.

Now I can just link the Tech FAQ.

:biggrin:
 

michael950

for me to POOP on!
Location
Houston, TX
NOTE: It is recommended that you do not use too large a needle valve
for your application. Many tuners recommend using a 2.3 or 2.5 needle
valve in all cases. Actually, we recommended using the smallest needle
valve that gives you the correct pop-off pressure for your engine. A 1.5
needle valve can flow the maximum amount of fuel that the Super BN can
pump, so the only reason to use a large needle valve is to obtain the correct
needle valve and arm spring combination (pop-off) for your watercraft.

So, the manual states you want to use the smallest N/S to obtain the desired pop-off. Does that mean if the desired popoff was 32psi, you should use the 1.5 / 65g combo over the 2.0 / 115g combo?
 

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
The reason for that is that the smaller needle valves have greater resistance to vibration,which in turn make the carbs easier to tune and stay in tune.
 
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