1992 Yamaha FJ1200 OEM Sprocket Sizes

[maxherman05]

Hello all, I have a 1992 Yamaha FJ1200 and I am wondering what the stock sizes of the drive/driven sprockets are for this year? (front/rear)

[aviationfred]

The sprocket sizes may be different in Great Britain, Europe and Australia. For the U.S. spec. 1992 FJ1200, the OEM sprocket sizes are.

17 tooth front
40 tooth rear


Fred

[Bones]

In Australia the 3xw model came with 17/39. Don't be worried about going bigger or smaller than standard sizes, the engine has more than enough grunt to handle it. I run 18/38 for better cruising revs in top gear but still have great acceleration.

[RPM - Robert]

Bones has it right. The two most common gear combos we sell are 18/38 and 18/39.

[Millietant]

My 89 came with 17/40 as stock, which I changed to 18/38 after a very short time.

I changed my 86 sprockets to 18/38 when I changed the chain the first time and loved that it got rid of the "always looking for 6th gear" feeling. As soon. As I got my new FJ in 89, my first change to the bike was to switch again to the 18/38 sprockets 

[maxherman05]

Thank you guys all for the quick replies!

[maxherman05]

Randy I ordered a 17T OEM sprocket from you do you know when it will be shipped out?

[melloncollie]

I replaced my chain and sprockets last fall and kept what I had on there, 17/40.  This thread has me thinking I may change that up at some point.  What rpm does everyone cruise at?  When the speedo shows 65 (60 or so actual) I'm at 4k rpm.

Randy I ordered a 17T OEM sprocket from you do you know when it will be shipped out?

If it was a stocked part that you ordered over the weekend it ships out Monday in my experience.

[Millietant]

I replaced my chain and sprockets last fall and kept what I had on there, 17/40.  This thread has me thinking I may change that up at some point.  What rpm does everyone cruise at?  When the speedo shows 65 (60 or so actual) I'm at 4k rpm.

Randy I ordered a 17T OEM sprocket from you do you know when it will be shipped out?

If it was a stocked part that you ordered over the weekend it ships out Monday in my experience.

With 18/38 sprockets, 60mph on my Garmin GPS Speedo (62-63 on the bike speedo), comes up at about 3,300 rpm.

Highway (Motorway) cruising is usually around 80mph Garmin (83-84mph FJ speedo) and it runs at about 4,400 rpm.

I'm running a 17" back wheel with a 170/60x17 tyre, so I'd guess a stock FJ 12 on 18/38 would be running very slightly lower rpm's at those speeds (by around 50-100 rpm's) than my bike as my back wheel circumference/diameter is slightly less than Stock.

[Pat Conlon]

180/55-17 with 18/39 running @ 4K rpm = 80 mph Speedo indicated

We have a separate File section devoted to gearing: https://fjowners.com/index.php?board=23.0

[Millietant]

180/55-17 with 18/39 running @ 4K rpm = 80 mph Speedo indicated

We have a separate File section devoted to gearing: https://fjowners.com/index.php?board=23.0

I wonder about the accuracy of the speedo on your bike Pat, with the change from a 16" wheel and different tyre width/aspect ratio - have you checked it out against a GPS speedo - it would be interesting to know if it made a difference?

I wondered similarly what effect running the front tyre on the slightly wider FZR front wheel would have on my FJ, but I really can't see any difference. My FJ speedo has actually shocked me by being more accurate that I expected it to be. My brother's GSXR 750 and a riding buddies CBR 1000 Fireblade both have speedo's that over-read much more than my FJ.

My 2001 FZ1 speedo over-reads vs my GPS by 7 mph at 150 GPS mph, but the 2003 FZS 600 speedo over-reads by 8mph at 100 GPS mph. Doesn't seem to be any pattern. My 2003 Aprilia RSV Mille speedo read only 2 mph over at 166 GPS mph.

Can you tell that I'm bored ?  

[Bones]

My speedo must be pretty accurate because 100kph/62mph has the tacho sitting dead on 3500rpm. Had a 170/60/17 tyre fitted previously now a 180/55/17 and didn't really notice any difference in the revs.

[Pat Conlon]

180/55-17 with 18/39 running @ 4K rpm = 80 mph Speedo indicated

We have a separate File section devoted to gearing: https://fjowners.com/index.php?board=23.0

I wonder about the accuracy of the speedo on your bike Pat, with the change from a 16" wheel and different tyre width/aspect ratio - have you checked it out against a GPS speedo - it would be interesting to know if it made a difference?

Hey Deano, I have not checked my FJ Speedo with a proper GPS unit. I prolly should do that... I would trust the gearing tables and the accuracy of my tach. before I would trust my FJ speedo readings....

Alas, I can't access the gearing table at this time (iPhone) can you check for me? I'm going by my memory, so I could be off...
180/55 with 18/39 gearing, 4,000 rpm should be = or close to 80mph?  It should be close...

[RPM - Robert]

180/55r17 at 4k with 18/39 shows 70mph.

[Pat Conlon]

Ok, thanks Robert....I'll trust the tables and my tach before I'll trust my Speedo....
I'll check it again next time I'm out...