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

Quote from: Gearbox Paul on Yesterday at 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?

Red,
It's a new battery. I put it on the trickle charger a week ago, and pulled it off the next day. Rode the bike a little. It showed about 12.8 when I first turned the key on. After starting and running at 3000 RPM or so, it showed 15.5 until I turned it down to the stop. Then it was 15ish. I've got a few meters and can check.

Waiex191,

Okay, this is not likely, but you should try another Voltmeter and see if the reading is the same. If you get two different results with two different meters, you will need a third meter to say which one is wrong.
As always, check that wiring connections are clean and secure, especially the grounds.
Discharge the battery until it shows a lower Voltage, then connect the battery and check the charging Voltage.
You may have an odd battery problem. Auto parts stores can load-test the battery for you, usually for free. HTH.

Hey guys,
Just finished connecting my adjustable VR as per the directions here. Unfortunately I'm still getting over 15 volts, even with the pot adjusted to the stop. I tried adjusting it the other way and saw over 16V. Any ideas?

One owner FJ1200 bought new from Baker City Oregon Yamaha.
Kept alive with a lot of help from RPM Randy.
Avon tires with about 2000 miles on them.
Aftermarket windscreen
RPM fork brace
RPM fork valves and progressive springs
New front disks and brake pads
Brake fluid changed every year
PC racing oil filter and RPM adapter
RPM carb kit and jetting carbs synced
UNI filter pods
Clutch slave cylinder rebuilt
F1R mufflers. Also have originals, left side is scratched from low speed drop.
Also been kicked over to the right side, right brake lever slightly bent and air scoops scratched.
Newer seat cover installed
givi tank bag attachment device
New chain and sprockets with about 2000 miles, rear sprocket two tooth less than stock.
RPM smoke LED rear light/turn signals with resistors installed for proper operation
Would recommend front caliper rebuild and new brake lines to improve brake operation
Small dent on right side of tank with 36 years of other signs of use, never abused
have most all original parts if interested to go with it.
Has around 40,000 miles on the odometer.
Great bike has never let me down, just time for upgrade to the FJR1300 so wife will ride with me again. I am still riding it to work on occasion as I can't stand to see is just sit and wait for someone else to enjoy this ride.
Asking 2500 OBO.  Located in Oregon  Video of it starting up and running.  https://youtu.be/5eC0vjERVAU?si=Wuray2X4izlsnIjI

Charley,
Can't help with hardware, but Plan B there might be to get a heavy power stapler, remove staples, and remove the seat covering. Build up the seat with foam "islands" as large as the top of the seat, and trimmed to fit you. Spray 3-M adhesive will anchor the foam sheets in place, and this glue never hardens. Once you like the fit of the foam under you, re-staple the seat covering in place. Taa-Daaa!
 
The foam layers used under ordinary carpeting is maybe 0.5" or 1 cm thick, and it is commonly used for custom motorcycle seats. An angle grinder or electric carving knife makes short work of sculpturing foam.