Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
He is not the OP. But that chart would work for him.
Super Jet SJ limited Mods High Altitude; How to tune?
- Thread starter awake
- Start date
- Location
- Placitas, NM
Does anyone know FOR CERTAIN what size the needle seats are in the stock Mikuni 38's (2015 model)? Trying to adjust carb pop off and need to upsize one size in needle seat
- Location
- Pueblo, CO
Remove one of the seats and look at the number stamped on the bottom. Pretty sure it's 1.5 and you should stick with it if so. Use springs to adjust popoff.
- Location
- Placitas, NM
I am targeting a 18psi pop off. I put 65g springs in. I'm registering 22-25 psi. Only way to drop the psi lower is to increase N/S, correct?
- Location
- Pueblo, CO
I'd leave it as-is at 22 and try it. Other than that you can get into trimming springs down which is tricky, or step up to a 1.8 N/S which are rare. As per @orangefinger 's suggestion, I'd stick with 1.5's. I don't recall ever putting anything bigger than that in a set of 38's
(Did you verify that they are 1.5's???)
(Did you verify that they are 1.5's???)
- Location
- Placitas, NM
No, haven't verified. Ski is at my buddy's place. Will have to check tomorrow
- Location
- Reno,NV
x2
@RMBC Freeride I don't get on here as much any more. I don't even get to the lake much any more 
I don't remember specifics but... ADA head with 33 cc domes. Factory Pipe Limited with their recommended jetting. Not sure on the carb screw or pipe screws settings. Sorry not much help but the ski does run really well.
I don't remember specifics but... ADA head with 33 cc domes. Factory Pipe Limited with their recommended jetting. Not sure on the carb screw or pipe screws settings. Sorry not much help but the ski does run really well.
- Location
- Placitas, NM
Got the mods completed. Went down to Elephant Butte NM on Sunday to do some tuning. Elevation is 4,300.
Ended up replacing N/S to 2.0 in order to achieve pop off pressure of 18psi with 65gr springs.
High and low screws indeed up being set at 2.25 turns out. I might end up backing the low speed out a smidge more.
All in all, the ski rips!
One of the local racers took a ride on it and thought it was every bit as quick as his 800.
Still need to put the Hooker on.
Ended up replacing N/S to 2.0 in order to achieve pop off pressure of 18psi with 65gr springs.
High and low screws indeed up being set at 2.25 turns out. I might end up backing the low speed out a smidge more.
All in all, the ski rips!
One of the local racers took a ride on it and thought it was every bit as quick as his 800.
Still need to put the Hooker on.
If your screws are over two turns out you need to go up a size
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- Location
- Placitas, NM
Why so?
Mikuni manual says the adjustment maxes out at 3.0 turns
It maxes out,yes. But it is not recommended. Anyone here will recommended upjetting when you're at 2+ turns out. The 3 turns out adjustment is great for seeing if it helps your carb setup or hurts it, and then you jet accordingly. In the tuning guide on the forum here it talks about that.
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