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.

Great Idea. over the years I've chopped and lowered dozens of seats for all different reasons, usually a cafe setup or making a too tall seat fit a different motorcycle. 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

Quote from: Warp84 on April 03, 2026, 08:33:38 AMI tried looking back in the post's but I didn't definitely see; When the engine was upbore to the 1188cc, did you also change the jet's in the carb to match the increased size?

Good question.  I did not install the piston kit, that was done by one of the previous owners.  So I can't tell you else was changed when this was installed, but I can tell you what I have now.  My present set up is as follows:

Main jet is 112.5
Pilot jet is 40
Pilot air jet is 155
Needle is 5FZ74 with circlip on 3rd notch (5 notches total)
Fuel air mixture screws 2.5 turns out
Air box is original, and air filter is OEM.
Exhausts are OEM.

Does that seem about right for an 1188 cc overbore kit?

Quote from: 81Delorean on April 04, 2026, 06:48:30 AMI had a similar experience when I did the VR mod to my bike last year. It worked good for about a week and then started overcharging again. Turned out to be a bad VR. I swapped it with another one and haven't had an issue yet with it since.

Thanks!  I do have another on the way.

I had a similar experience when I did the VR mod to my bike last year. It worked good for about a week and then started overcharging again. Turned out to be a bad VR. I swapped it with another one and haven't had an issue yet with it since.

Thanks Mike, I searched for that on the forum and have a couple more things to look at.

Quote from: Gearbox Paul on April 03, 2026, 08:28:03 AM

Quote from: T Legg on April 01, 2026, 05:09:09 PMThe FJ wouldn't be a match hp wise with your other bikes but I wonder if you might have some carburetor issues.

thanks for the replies and thoughts.  Regarding horsepower, the FJ with the 1188 cc piston kit should be around 130 HP at the crank (similar to FJ1200).  My GSXR 750 is 128 and the ZX9R is 143.  So the FJ is in the same ballpark as the other two bikes, albeit with lower redline and higher torque. 

I've been riding the bike some more and I think it's just me getting used to it.  The FJ has much higher engine braking than the other two bikes, which is likely confusing me.  I do notice signicant vibration as I rev past 4000 rpm as well.  Not sure if that's a normal harmonic or perhaps my engine mounts are shot.  I've removed, cleaned and recleaned the carbs so many times in the last year as I was chasing leaking carbs (now fixed), that I a reluctant to tear into the carbs again.  I'm confident they are as clean as they can be.  I don't have a fuel filter (other than the stainer on the petcock), and the air filter is clean.  It's quite possible that compression is low, I haven't tested it. 

The bike starts, idles and runs generally well, so there's no rush in changing anything.  For the moment, I'll keep riding the bike as is and get used to what I got. 

I tried looking back in the post's but I didn't definitely see; When the engine was upbore to the 1188cc, did you also change the jet's in the carb to match the increased size?

Quote from: T Legg on April 01, 2026, 05:09:09 PMThe FJ wouldn't be a match hp wise with your other bikes but I wonder if you might have some carburetor issues.

thanks for the replies and thoughts.  Regarding horsepower, the FJ with the 1188 cc piston kit should be around 130 HP at the crank (similar to FJ1200).  My GSXR 750 is 128 and the ZX9R is 143.  So the FJ is in the same ballpark as the other two bikes, albeit with lower redline and higher torque. 

I've been riding the bike some more and I think it's just me getting used to it.  The FJ has much higher engine braking than the other two bikes, which is likely confusing me.  I do notice signicant vibration as I rev past 4000 rpm as well.  Not sure if that's a normal harmonic or perhaps my engine mounts are shot.  I've removed, cleaned and recleaned the carbs so many times in the last year as I was chasing leaking carbs (now fixed), that I a reluctant to tear into the carbs again.  I'm confident they are as clean as they can be.  I don't have a fuel filter (other than the stainer on the petcock), and the air filter is clean.  It's quite possible that compression is low, I haven't tested it. 

The bike starts, idles and runs generally well, so there's no rush in changing anything.  For the moment, I'll keep riding the bike as is and get used to what I got. 

there was a thread on here about this, but to summarise the voltage sensing wire takes its reading via the ignition switch, which given the age drops the actual battery voltage by at least half a volt or more depending how worn the contacts are. trick is to connect the battery direct via a relay switched by the old sensor wire so the generator gets actual battery voltage. I did it a few years ago and now seems to charge ok. used to eat gel batteries or dry out wet ones every few years.

Hi Paul, you posted up on the UK Facebook FJ page but the topic has been deleted. I answered your question and was hoping to see a few more answers when i logged on this morning.
Has your bike got this Axel Joist DBox wired into the FJ loom or a custom made loom?
I and someone else suggested that you join the clutch and neutral wires together which sounded a bit confusing but we meant the individual component wires not both components together.
Have you made any progress?