I am having the same issue (not running with side stand down while in neutral) on a 1990 FJ1200 that I am fixing up. I don't see a diode block like on the FJ11, does any one know where diodes might be physically located in the wiring harness?  If I am reading the wiring diagram correctly they do seem to exist but not in a big block like the older bikes. 

Open to other ideas of solutions.  My clutch and side stand switches are all working as expected when tested with a multi-meter and the neutral light comes on when in neutral and turns of when in gear.

Thanks!

Garth, count me in.

Best wishes
Kurt

Thanks Garth!  I'd take a long sleeve and a short sleeve shirt, black or grey.  I'd also go for a new hat or two (LA Mike or Fred maybe?)...

Frank

Yes, I'm in for a XL long sleeved T shirt...black.

Thanks Garth!

Mikuni uses letters and numbers to describe their carb models.

The letters indicate what type of carb and numbers indicate the diameter of the throat in millimeters.
For example, for oem we have BS36 CV carbs on our FJ's the 36 is for 36mm throat size.

Mikuni also makes an RS36, RS38, and RS40 flat slides for our engines, along with TMR 36, 38 and 40 roller flat slide carbs.

My point....I seriously doubt you have 33mm diameter carbs on your FJ....if you do, then they are woefully undersized for our big engines.

If you have the Mikuni RS36 flat slides, you want to speak to T Legg (Travis)
https://fjowners.com/index.php?topic=19684.0

I'm looking at a 92 FJ1200 that has Mikuni 33 flatslide carbs.  The seller says that the bike isn't running right, and believes the carbs are the problem.  My intention would be to buy the bike and do a carb rebuild.  Or possibly go back to stock carbs and sell the 33's.  I did a search here for any info on these carbs, but didn't find anything.

My research elsewhere tells me that this is a popular performance upgrade.  Any opinions or info that anyone can share about this upgrade?

Thanks,  Karl

Current bikes:
1986 FJ1200
1991 FJ1200
1979 XS1100 Standard
1979 XS1100 Special
1981 XS400 Special
1994 Yamaha Venture Royale 1300
1999 Honda Valkyrie 1500

Quote from: Redtk421 on March 10, 2026, 10:05:00 AMHey Gang! Picked up a resurrected 86 FJ1200 this winter and looking forward to Spring riding. Wanted to get the opinion of those who have experience with either the HB Junior 30s and 40s. I'm considering both sets and have the "Endro" option (1-30L and 1-40L) as well. Not sure I need 40L for commuting to work every day but wanted to hear from some of you road warriors. Will a large helmet fit into a 30L? Thanks!

I have the Junior 40L and the Junior Flash 30L bags.
A full face helmet will NOT fit into the 30L bags. A Bell Star helmet barely fits in the 40L bag.
With California and Utah as the only States that allow lane filtering, the 30L bags are much better in that environment. I prefer the 40L bags on the FJ. I purchased the 30L bags for use on my Hondas.
The all Black bags in the photo are the Junior 40L. The Black/Red bags are the Junior Flash 30L bags.

I hope this helps.

Fred

Anyone have interest in swag for the rally?

I have a friend who has everything to make T-Shirts, Sweatshirts, custom koozies, etc.

Post up here and if there is enough interest we can come up with a design and price list.

Excellent...you had me going there...

For storage I run 87 ethanol free (clear) gas in my 1380 with 10.5-1 compression. It runs fine for short around town warm up rides. Long rides, hot weather I run 91 E10 gas, no problem....the E10 only plays havoc when I store my bike....I then drain the tank and go back to 87 clear gas if the bike sits for 2 weeks or more. 

With a stock FJ, the owners manual specifies using regular 87 gas. You should be fine.

Stock FJ factory jetting runs lean, when you get a chance remove the #37.5 pilot jets and put in #40 or #42.5 pilot jets and bump your mains from #110 to 115 or 117.5.
 Your bike will run cooler in the hot summer thin air high altitude Colorado locales.

Cheers

Pat