12R-14105-00 is the superseded # of 4G0-14923-00 from the 1980 XJ400 Japanese model. same # different Prefix as the Japanee B34 pilot screw 3L1-14923-00
What I'm trying to get away from here is the stringent USA EPA specs for both of my 1980 Specials that are all stock (filters, boxes, etc.).
Do we have the Air Jet spec (#46 on diagram), I believe I read in the past it was a 130?
If your going off the 4E3 Japanese set up here is the 2nd page showing the size for #46View attachment 240778
Courtesy of Skull & translated from Japanese (Oceana, Canada, etc)
View attachment 240739
It'll depend on the intake and exhaust you're running on the build; but, if ya start with stock "Canadian" jets, a 42.5-45 pilot and the fuel screw adjustment will likely be enough to geterdone. The main; my guess would be a 130 to start with a size either direction on standby. Then you'll also have the adjustable needle to play with if needed (doubtful).
I'm goofy, but I like to set my pilot circuit a bit rich for drivability and to where 15sec max of choke is all that's needed on cold start
Have you tried the little 3mm washer under the needle? Did that to my SG and it definitely helped eliminate the off idle stumble.I just want to get a little quicker transition to the middle of the acceleration band instead of the lean hesitation down low that they both have right now.
No I havent, but I did order two sets of Canadian needles and Canadian needle jets.Have you tried the little 3mm washer under the needle? Did that to my SG and it definitely helped eliminate the off idle stumble.
+1 on JP's richer pilot circuit. You don't really spend much time down there anyway, but it really cuts down on warmup time.
Yep, you can bet I bookmarked your post/specs.FWIW, both of my stock Specials run like they’re fuel injected, although the smaller air pilot jet makes the SK harder to start. Theoretically, both bikes are the same, but they aren’t. My jetting for each is in an earlier post. At that, both bikes are a quick warm-up.
There are different ways to do it and I don’t think these experts are doing it wrong. I followed @5twins and I think I’m close to as good as it gets. Fatter pilot jet gave me a stumble at the changeover.
Below are my two stock Specials.
XS650SK:
Pilot 42.5
Pilot air 132.5
Main 135
XS650SH:
Pilot 42.5
Pilot air 130
Main 137.5
My only measurable deviation from stock is the aftermarket filters in the airboxes.
Amazing....who needs bifocals and a magnifying lens anymore?!! (You really could use a manicure by the way!)Well this is pretty cool....
A few months ago my phone died. I don't get it... it was only 6 yrs old.
Anyway, bought a Pixel 7 Pro. The camera in this thing is unbelievable. Here's the macro setting.
I might just throw my magnifier in the trash.
Main Jet...
View attachment 240809
Pilot jet...
View attachment 240810