Mikuni Spring Color & Popoff Pop Off Chart
- Thread starter Shonuff
- Start date
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
spring w/pic thanks to 2lick
Attachments
#ZERO
Beach Bum
- Location
- Florida - U.S.A.
Good post, this needs to go in the Tech FAQ section.
michael950
for me to POOP on!
- Location
- Houston, TX
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?
michael950
for me to POOP on!
- Location
- Houston, TX
One other questions, for what purpose would you use the Viton N/S?
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.
SUPERTUNE
Race Gas Rules
- Location
- Clearwater Fl.
I'd call the new 115 gram spring more like chrome color, not near as silver as the dull gray 95 gram spring or real silver 65 gram spring.
michael950
for me to POOP on!
- Location
- Houston, TX
The reason for what, the smaller n/s (which I assume) or the use of the Viton tip?
michael950
for me to POOP on!
- Location
- Houston, TX
BTW:
Here is another copy of the chart from the Mikuni Watercraft Carburetor Owner's Manual
Despite the page count, it is an easy and somewhat quick read.
You can use this info as a point of reference in the event you do not have a gauge.
Here is another copy of the chart from the Mikuni Watercraft Carburetor Owner's Manual
Despite the page count, it is an easy and somewhat quick read.
You can use this info as a point of reference in the event you do not have a gauge.
Attachments
Last edited:
Foximus
CFL Cheapass.
- Location
- Oviedo, Fl
On a side note. I have 4 springs laying here brand new from a rebuild kit. They are identical to the pictures posted in length... but now the gold is longest.
From longest to shortest, I have
Gold
Silver
Black
Silver
I cant tell a difference between the two silvers. Is the shorter the spring the higher the pressure? I'm shooting for a 20-25 psi pop on dual 44s.
Never Mind. Turns out I have the old style kit with Gold 115's
From longest to shortest, I have
Gold
Silver
Black
Silver
I cant tell a difference between the two silvers. Is the shorter the spring the higher the pressure? I'm shooting for a 20-25 psi pop on dual 44s.
Never Mind. Turns out I have the old style kit with Gold 115's
Last edited:
- Location
- Grand Rapids, MI
I am running dual 44's. 2.3 n/s with 95 gram spring. The 95 gram springs are wound the opposite direction as the other 3 springs.
SUPERTUNE
Race Gas Rules
- Location
- Clearwater Fl.
The dull gray/silver 95 gram springs will have only 1 turn of closed loops at the end of the spring, all other have 2 1/2 turns of closed loops at the ends of the springs... that makes it really easy to spot the 95 gram spring compared to the shinny silver 65 gram spring which is also a tad shorter.
Note: You can see it in pic of post #2 by DAG.
Last edited:
Midlake Crisis
Site Supporter
- Location
- Bakersfield, CA
I want to know the answer to this too - I was looking at the jetting database and it seems like EVERYONE is running the larger N/S.
I have a 2.3 now but am about to freshen up my carb and am thinking about switching to a 1.5 I have on hand, as the Group K tuning manual recommends. Thoughts?
Great post with the documents/springs. Thx.
What's the method/tools for checking actual pop off? I've been told you can use a small, cheap bicycle pump and whatever else???...to check pop off. Can someone give post a "how to" on this topic?
What's the method/tools for checking actual pop off? I've been told you can use a small, cheap bicycle pump and whatever else???...to check pop off. Can someone give post a "how to" on this topic?