Appreciate the information 86FJNJ and Robert, thank you!

Quote from: JohnnyTheCraneGuy on December 04, 2025, 09:15:42 PMLet's go!

I'm sure you're aware of it but its goes without saying, check your chain slack. You definitely don't want to be outside the range on either side with the amount of torque these bikes have. I myself like to ride on the looser side of the spec.  Chain and sprocket alignment too, just in case you weren't aware

Ride safe brother 

Thxs

You can use a 3/8 to 5/16 brass reducer to accomplish the reduction needed to go from 10mm to 5mm. Or you can get a pump off eBay that has 10mm inlet/outlets. Get a couple of them as they go out.

The Yamaha Mitsubishi pump is made for the single inlet tee on the fuel pump carbs at 5/6mm I don't have one handy to measure but it is roughly half the size of the dual 10mm inlets on the gravity feed carbs. You can use the Mitsubishi pump with reducers or you can get a couple cheaper pumps with 10mm nipples. Either will accomplish the same thing but the reducers will get you a superior pump.

I am using the RPM fuel pump on my 1986 that I converted from gravity fed to fuel pump. It works fine I have like 2,000 miles on it with no issues.

I can take pics tomorrow if that helps

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I have a question about converting my 1985 FJ1100 from gravity flow to a fuel pump.  I am confused.

The carbs were sent to RPM to be converted and I ordered the fuel pump sold by RPM

Today Randy at RPM called to discuss work on my carbs, and the topics of what fuel pump is appropriate and what diameter fuel line to use came up. I understood from Randy that the RPM fuel pump is NOT suitable for the conversion and that a fuel pump with a larger diameter opening should be acquired as should larger diameter fuel line.  (I cancelled the pump sold by RPM as a result).

The two-part article on the fuel pump conversion specifically references using the RPM fuel pump and fuel line, which leads to my confusion. 

Can anyone help unconfuse me here?  Pat Conlon, Randy mentioned that you use a different pump than RPM's that has a larger diameter output.  Perhaps I missing something here, but I thought the fuel pump used a smaller diameter output than the gravity flow did.

Sorry to visit my confusion on y'all,

Steve

Welcome on board

Quote from: T Legg on Today at 02:01:58 AMBoth of my FJ1100's have been re-painted but my 86 FJ1200 has the stock paint job and stickers.The FJ1200 sticker on the rear fender cowl measures 5-1/8" long by 1-1/8" tall. It doesn't have a Yamaha sticker. I dont know if its exactly the same size as the FJ1100 sticker but it looks like it must be close.

Perfect.  Thanks

I use those guys: https://rddecals.afegraphics.com/index.php?cat_id=19168&catname=FJ+Line

OEM quality.

Both of my FJ1100's have been re-painted but my 86 FJ1200 has the stock paint job and stickers.The FJ1200 sticker on the rear fender cowl measures 5-1/8" long by 1-1/8" tall. It doesn't have a Yamaha sticker. I dont know if its exactly the same size as the FJ1100 sticker but it looks like it must be close.