transmission fj1100 -fj1200

[gp1]

hi i have a fj 1100 with transmission problems can anyone tell me if a fj1200 transmission will bolt on to 1100 motor as i can get a 1200 transmission off a bike that is been dismantled.

[tqmx1]

The later the transmission the better off you you will be (they are bolt in's) The only thing I would say is to get new shift forks the early one were a bit on the week side.

[racerrad8]

The FJ1100 & 1200 transmissions are the same. There is a difference withthe XJ1250/1300 as the transmission output shaft is approximately 1/4" longer.

Like stated earlier, make sure you upgrade to the new shift forks.

Randy - RPM

[gp1]

thank you for the imformation it has been very helpful.

[paulfj03]

hey gp1, or randy,

I'm just wondering how the exchange of the 1100 to the 1200 gearbox went.  that is certainly an option for me as ive noticed that at 70000km my 1100 goes in and out of 2nd gear under heavy load......
Is the exchange done quite often now, as opposed to the re and re and or unercutting?  Is there much diffrerence in skill requirements to do the each repair method?

thanks in advance.....

[gp1]

hi paul
the exchange is very easy.the hardest bit i found was getting the clutch basket nut off without braking it even after i made a tool to hold it . i used the 1100 casing as the 1200 one has a broken rear engine mount.
so put in 1200 transmission gears and the selector forks that were nearly brand new, fitted about 2000 km before
the 1200 was wrecked.so now i have a 1100 and 1/2 lol.

gp1
(graeme)

[Ratchet_72]

Just curious but what are your problems? I don't know what you know about the FJ so I won't assume anything. You sure it's not the clutch? I ask because clutch work is easy and trans. Not so much.

[paulfj03]

Hey graeme,
thanks for the response...good to know I'll make sure to take my time so I dont break my nuts...   you should add decals of 1/2 ....lol
so the main cause of the 2nd gear skipping is the  original weak shift forks bending?  do you know if anyone has had the problem re-occur?...Ive tried to read up as much as I can and I have yet to hear of someone having to do it a second time....
I assume that when you order the shift forks the replacements are stronger...(?)

Thanks for the question Jason, I certainly would not know as much about the fj s as you guys here would.....I'm all ears...
I was thinking that it was not the clutch....some one else asked the same question while we were out for a ride.
under heavy load...honk'n on it hard ...it would be fine in all gears except for that #2...it would let go and grab again and then let go , and grab again, etc.
Over time, slowly its frequency increased until , with a passenger, it didnt take much..

would the clutch let go in all gears randomly, or could it just let go in a certain gear only?
thx again in advance

[threejagsteve]

it would let go and grab again and then let go , and grab again, etc.
Over time, slowly its frequency increased until , with a passenger, it didnt take much..

would the clutch let go in all gears randomly, or could it just let go in a certain gear only?
thx again in advance

Though I've never experienced the infamous second-gear problem, your case certainly sounds like clutch slipping to me!

Why only second? torque multiplication, my friend!

And the fact that it's worse with a passenger (extra load) is added evidence that it is your clutch.

[Fred]

You sir, have a bent shift fork Repairing the problem would not be any harder than replacing the entire gear set. As a matter of fact if I were replacing the trans with an early 1200 assy, I would make this repair on the replacement just to be sure. Order up the replacement part, (whch has been strengthened) and the gears. Send the gears out to a machinist to have the dogs undercut. It's a big job but not too hard. You have to pull the engine and split the cases. Definitely have a GYSM on hand. You can do it!

[paulfj03]

hmmmmm.....
Is there any way to find concrete evidence of the problem? without splitting the cases?
would that mean looking at the clutch parts for wear/damage?

thx again guys
-p

[tqmx1]

Rule 1 If it jumps out of 2nd gear and only 2nd gear the forks need replacing and the related gears should be changed (and yes it can be done in bike)

Rule 2 A slipping clutch will show up with a heavy load (4th or 5th gear and trying to pass traffic) at that time the RPMs will go for the moon and the bike does not accelrate. The only way to bring it back is to ease off the throttle.

My first FJ had both problems at the same time

[Ratchet_72]

Mine had started to slip in ALL gears under a moderate load, turned out to be a broken clutch basket. Replaced and all is good. Taking a look at the clutch is simple and doesn't require draining anything, just sit the bike at an angle on the SIDE stand and all oil drains from the right to the left ads ofthe case and you canopen it up and take a look. Look closely at the basket, it may not look to bad at first because the springs behind the basket will hold everything together so you can't SEE any cracks evenif they're there. Grab a flashlight and look close. Maybe even take the discs etc. Out so you can see the whole basket.

[threejagsteve]

...it would let go and grab again and then let go , and grab again, etc.

If the problem were a bent shift fork, would it not go out and STAY out?

[gp1]

no i found on that under load it would thump out of 2nd and a second or to later it would thump back in ,let the revs drop and then under load again it would thump out again ,it was almost like a miss fire.it happened at lower revs but when both myself and my wife on the bike.

gp1
(graeme)