Jetting Recommendation

Z

zanesimmons

Location
US
Need a starting point for jets.
Currently have a 46 Mikuni SBN w/2.0 NS (20psi pop off), 115 low, 150 high.

Motor is a bored (84mm) and ported 61x, stock crank, Ada Head with 37cc domes, aftermarket reeds, and a RRP carbon pipe.

Any help would be great. Thanks

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x2mafia

x2mafia

Maximum effort
Location
WA
61x bottom end? hows it run now?

I think I was running about the same with a tnt pipe instead of the RRP with 120 150
 
Z

zanesimmons

Location
US
Thanks. Its a completely fresh build for an MX1. Have no idea how this will run. Hopefully good, as access to the carb is a pain in this hull.
b70f2e1818753c4d228dae7394289be5.jpg


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x2mafia

x2mafia

Maximum effort
Location
WA
You call that a pain? Lol looks like I could crawl in their, watch Netflix and talk dirty to that carb till it took itself off
 
Zero Client

Zero Client

BeerrroooOOOT!!!
Location
Douglasville, GA
With the exception of the pipe and the ski, I've tuned two stand-up skis with a similar setup but running a Limited B-Pipe and NOT a lay-down, try this jetting to start:

SBN46, WetJet intake, 61x/61x, B-pipe limited, ada head, freestyle ported, MSD enhancer, h2o waterbox:

Pilot jet 135
2.0ns/80g
Main Jet 155
L1.25 turns
H1 turn

In my notes, one of the skis I tuned still had a slight stumble off idle, and that ski ran better with a 65g spring with all else the same above.

With a laydown pipe I'd suspect you might need to increase your high jet, and possible lower your low jet (As a B-pipe requests more down low and less up top). Start with the 155 and do a plug chop.

You'll also find with this setup the engine may idle better at about 1 turn on the low screws - which is more important on a sit-down. Start with 1.25 and go down from there.

Also with a bigger boat (MX1) your mileage may vary.
 
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