When we re-jet our carbs for intake and exhaust mods, we discuss changes to the pilot, the main, and the needle height. But I don't usually see any recommendations to change the stock #155 air jets.

I have a new project bike, a 1992 FJ1200 with 4 into 1 Vance & Hines pipes and pods. I bought it not running. The PO had 37.5 stock pilots, 118 mains, and 144 air jets.

I'm was planning to put in 42.5 pilots and sticking with the 118 mains for starters. Then I realized the air jets weren't stock. How will the 144 air jets affect this setup?

Is changing the stock air jets from 155 to 144 similar to changing the pilot jets from 37.5 to 42.5?

Nice! How much lower are these than the stockers?

Quote from: RPM - Robert on April 04, 2026, 01:40:06 PMPost a picture of a slide and the main jet needle.

I don't think I have any pictures.  The carbs are in the bike and the bike is on the road. 

Does anyone have a writeup on removing and rebuilding the ignition switch?

I have a set I'd let go for $100 +s/h.  Hard work is done, bolt on and go.

Post a picture of a slide and the main jet needle.

Never got a date with Heather. But I bought the second 86 fj1200 sold in Wisconsin in 86.
Put 14,000 miles on it in 2 1/2 months. And totaled it out. When someone crashed in front of me at around 135mph. Now have 7 of them.

I would love to have one. If you are willing to ship to the US. I hope to make it over there sometime soon. Been on my bucket list since high school... a million years ago.

Quote from: Pat Conlon on March 31, 2026, 07:02:29 PM$6.16 @ Amazon vs $2.35 @ RPM.

Yah same thought. I could see it was a bag of 20. But it's just one.
Besides I would buy from RPM. Whenever you can just to thank them for all they do for us.

Quote from: charleygofast on April 04, 2026, 09:42:05 AMGreat Idea . . . I have been thinking of trying this on my spare seat. for the time being I have a pretty nice sheepskin that brings it up a little.                                                                                                                 Charley

Charley,
Even better, then. Cut the carpet-foam "islands" to the size of the seat top, and try them in several layers under the sheepskin cover. If you get up to something that you like, then you can easily install the foam under the seat upholstery-cover. Use short heavy staples (maybe 1/4" or 3/8" deep) to re-install the OEM seat covering. HTH.