Other Mikuni sbn reverse jetting??

[849tigerbotkv1]

I would like to know the benefits of reverse jetting on dual sbn's . Is it better than jetting it per manual?

Thanks in advance

 

[High Speed Industries]

I have reverse jetting in my dual 44s. It seems to have more of a bottom end hit than the regular jetting. I think it's kinda weird that I have no dead spots at all with either jetting. I didn't gain any speed or any power, I just think it gave me a bit more power down low. So I'm not sure if there is a big benefit or not.

 

[wanderer1]

Jet carbs according to what your setup requires. Sometimes you end up with "standard" and sometimes you end up "reverse". Tune the package or pay someone to do it.

 

[BMWtech]

Mine are reverse jetted....it's almost where it needs to be but I'm still messing around with it. Dual SBN 46s.

 

[TheBuzzard]

there was a huge discussion on this some months ago. i'm sure mattE could give you the exact link, if he even does this anymore.................

 

[Roseand]

Looks like mattE hasn't been on here since Dec. 22..
He moved on from skis I guess.

 

[Lumpy]

http://www.x-h2o.com/index.php?threads/reverse-jetting.128496/

 

[Big Kahuna]

Every Setup is different........... What works on one ski, may not work on another........

Case in point, about 10 years ago I was having some carb issues. could not tune out. I was running ported cylinder (same one to this day) with OEM 38's. 105 lows and 140 highs (something close to that), this is per close recommendations by TLR. Well, John as JSS was with us, he kept saying "Your too rich, that jetting is not right, so, I stuck in 80 lows (Just like every other Tom Dick and Mary had in many of their superjet setups).... Not 4 minutes later I am sitting on the beach with a seized motor...... Not blamming him, I willingly tried that jetting. But there is a reason that Todd at TLR told me to run those higher jets in the low speed. His porting was done in such a way that it required more fuel down low.

 

[Mark44]

O sure blameing it on john still.

 

[Big Kahuna]

Nope. I rejetted on my own...... 2 lessons learned.........

1. Dont trust someone who knows nothing about "your Setup".
2. See #1

 

[Mark44]

Funny thing is I remeber hearing that lol man were getting old.

 

[waxhead]

Whats the spec on your boat. Mark44 I think we have all been here before, maybe more than once.
Reverse jetting works I wrote a big explanation as to why but I really cant be bothered writing it again search and you will find grasshopper ( now im really getting old)

 

[Big Kahuna]

Funny thing is I remeber hearing that lol man were getting old.

I learned an important and expensive lesson that day.

 

[Mark44]

Wax, its not me who needs the jetting. however many many years back I had issues tuning my 44's and you helped me out and got the boat tuneable. I think it was fill the cross over and remove the reed stuffers.

 

[waxhead]

Yeah mark. I wasnt talking about you. Just the whole debate that went on and on with numerous people over a 18mth period lol.
I know I finially convinced you to take the stuffers out. Some peopl still dont believe me, If groupk says it then it must be fact mentality

 

[849tigerbotkv1]

That is a good reading waxhead .


Do you think i should reverse jet my sbn i40 on kawi 850cc?

Im at 80L 152.5H 2.0 N/S 80gram springs (black)??

Thanks

 

[waxhead]

Never done it with thos carbs on a sxr, But I would be trying it if it was me

 

[849tigerbotkv1]

What jets /n/s and springs would you start if you were to try it?

 

[augustaf]

I read all the posts and still don't know what engine or carbs you have. Here's a suggestion that works for dual 44 aftermarket (46 about same) used on a 700 -780 cc Yami: 2.3 n/s, 110 high, 115 low.

 

[h2odesperado]

Looks like mattE hasn't been on here since Dec. 22..
He moved on from skis I guess.