New build jetting questions

[Guest]

Okay folks, built a 77 gs750 w/844cc kit, mildly ported head webcam #110 has a. 395 lift, dyna 3 ignition with dyna coils, header. I have a set of 26 mm carbs from a kz1000 for it so question is anyone have any idea where to start with the jetting, pilots? Main? Needle position etc. Thanks for any help you can provide

[Steve]

Sounds like you have the basic parts for an 850 with a cam. Start with the jetting for an 850, then add a couple sizes for the header.

I am going to presume that with this build, you are not going to use the stock airbox, so add a few more sizes for the pods.

Pilot jets should be stock (for an 850), I might try raising the needle one or two notches. Note that to raise the needle, you lower the clip.

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[Oldskoolchopshop]

Sounds like you have the basic parts for an 850 with a cam. Start with the jetting for an 850, then add a couple sizes for the header.

I am going to presume that with this build, you are not going to use the stock airbox, so add a few more sizes for the pods.

Pilot jets should be stock (for an 850), I might try raising the needle one or two notches. Note that to raise the needle, you lower the clip.

.

844cc yes however 10.25:1 compression

[GregT]

Are you running an airbox ? Pods or open carbs ?

I've used Z1 carbs on a Z650/750 conversion - but open bellmouths.
If what I did is of use to you, I can hunt out the jetting info.

[Steve]

844cc yes however 10.25:1 compression

Compression ratio will not change how much air it breathes, only how tight it squeezes it.

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