78 gs rejet question

[Guest]

Looking to do pipes and pods
So I'm going to clean and rebuild them ,then check float hieght

i have 15 pilot and 100 mains, I don't understand what +6 sizes is. I see a lot of poeple running 117.5 how would I adjust my carb to that and should I order 17 pilots?

[Steve]

You may have "15 pilot and 100 mains", but it's also important to know what bike.

The "sizes" are the increments in jet size. Mikuni jets increment by 2.5, so one step up from 100 is 102.5, then 105, 107.5 etc. Six sizes up would be 115. You don't "adjust the carb to that", you buy new jets and install them.

Usually, there is no need to increase the size of the pilot jets. Your '78 "whatever" will have VM carbs, making it quite a bit easier to adjust your pilot mixture.

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[Magicalzoomer12]

Hey Steve,

Any advice on a 1980 GS550? Trying to do the same thing. i added a thread to this group but didn't hear anything back. Thanks in advance. What about the Dynojet stage 3 kit on CV carbs? Thanks dudes!

[Steve]

Dynojet kits are highly recommended for CV-type carbs, and are not usually necessary on VM carbs.

Zoomer, the jet you need will depend on what you install, but if you are looking at pods and a pipe, the DJ kit will get you REAL close.

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[Paulie2026]

It's a gs750 thanks that's exactly what I needed to know

[Paulie2026]

Any links for the pilot adjustment?

[allojohn]

Any links for the pilot adjustment?

Stick with the stock 15 pilot. Adjustment on the last page of the VM rebuild pdf.