61x 735cc B-pipe jetting question for 46mm carbs

[Rustbucket]

Hey, I was wondering if someone can give me a jetting size that worked for their 735cc single 46mm carb when running a B-pipe. Has anyone done this before? Or is everyone running a 62T at that point? Any help is appreciated!

 

[eastcoastjumper]

Hey, I was wondering if someone can give me a jetting size that worked for their 735cc single 46mm carb when running a B-pipe. Has anyone done this before? Or is everyone running a 62T at that point? Any help is appreciated!

I have it written down at home. When i get back from daytona ill post it for you. Dead on for sea level

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[tor*p*do]

Interested in seeing what youcome back with

 

[Rustbucket]

Awesome! That would be great thanks!

 

[tor*p*do]

Going to try this as a fat starting point:
125 Lo 165 Hi
2.3 n&s 95 gr spring
2 turns Hi 2 turns Lo
Popoff 15 psi

 

[Rustbucket]

I have it written down at home. When i get back from daytona ill post it for you. Dead on for sea level

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Hey did you get a chance to look up the specs for the tuning?

 

[eastcoastjumper]

Hey did you get a chance to look up the specs for the tuning?

i just got to my shop, ill look now and post back

 

[Rustbucket]

Awesome thanks

 

[eastcoastjumper]

132.5 pilot
165 main
2.0 ns
black spring (18-20) psi pop off
low speed screw open 1 turn, high speed screw 1.5 turns

Jetmaniac 61x on 61x cases(ported by blue)
Wetjet 46mm carb on wetjet (westcoast) manifold.
i had a b-pipe, reeds, msd enhancer, and 35cc domes in an ada head.

Had a stock pump with 9/15 hooker and then a mag pump with a few diff props in a 96 superjet

Could run wide open forever when the pipe had correct cooling.

I saw someone posted 115 low 150 high. This engine would have seized. I got over 250hrs( 10+ gallons of oil through it) in a year without issues. Changed wrist pins at 100hrs and ran Pennzoil 40:1

When i had a single 44 on it it was 120-125 low and 147.5 high. The plug check on both motors was very light brown.
Something about the 46 being larger and pulling the fuel through the jets differently is why they are much larger than the 44mm spec.

 

[Rustbucket]

Have you ever ran 33mm domes? I was thinking about doing that? Should I stick to 35mm?

 

[eastcoastjumper]

Have you ever ran 33mm domes? I was thinking about doing that? Should I stick to 35mm?

@BruceSki does, but he also keeps his tune in check and doesnt run wot for too long

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[BruceSki]

33cc domes is what’s up. As long as you run enough fuel you’ll have no issues on 93 octane.


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[Rustbucket]

Perfect! I have both 33’s and bought a set out 35’s just in case. So this jetting will work for 33’s?

 

[BruceSki]

Make sure to do plug chops and be sure that jetting is correct before doing lots of riding.


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[Rustbucket]

What plugs are you using? Whats the gap spec that you have?

 

[BruceSki]

I run B8EG as they come out of the box gapped with an MSD enhancer. If you are running stock CDI you’ll want to close up the gap pretty small with higher compression.


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[Rustbucket]

Awesome thanks for the info! I’ll let you know how it goes once I’m done building my motor

 

[Rustbucket]

Where do you guys order your jetting, needle and seats from?

 

[BruceSki]

Jetmaniac supplies me with everything I need


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[Rustbucket]

Perfect. I’ll look it up then. Thanks for all your help!