FZRSupport: the FZROnline Archive

Does anyone know what the output shaft thread size is on a 1994 FZR600R 4JH (YZF600).

Thanks,

John

jallen wrote:Does anyone know what the output shaft thread size is on a 1994 FZR600R 4JH (YZF600).

Thanks,

John

John,
It used to be that you could work out thread sizes and pitches from Yamaha -part numbers for the nuts,I do not know if they still use that internal code though

IF it still holds true the nut is an 18mm thread and it will be a standard fine pitch, just measure the shaft diameter on the thread and let me know please just to either remember the code works or it is now rubbish Thanks
Y_Geo.

yamaha_george wrote:

jallen wrote:Does anyone know what the output shaft thread size is on a 1994 FZR600R 4JH (YZF600).

Thanks,

John

John,
It used to be that you could work out thread sizes and pitches from Yamaha -part numbers for the nuts,I do not know if they still use that internal code though

IF it still holds true the nut is an 18mm thread and it will be a standard fine pitch, just measure the shaft diameter on the thread and let me know please just to either remember the code works or it is now rubbish Thanks
Y_Geo.

Thanks, I reckon you are right.

The front sprocket came off the shaft a few weeks back when I was doing about 40mph. Luckily it didn't do any damage but it did take 5 hours for a recovery truck to arrive which wasn't great. It was fairly obvious at the side of the road to see what had happened as the chain was very slack. Didn't stop the AA chap wanting to jump start the bike for some unknown reason.

Bought an M18 1.5 Die Nut and managed (hopefully) to sort out the output shaft thread. I have a new nut and lock washer fitted and it took the correct torque setting.

After I got the bike home I found a scrap of paper in the paperwork that came with the bike that said when the Chain and Sprockets were replaced they didn't fit a Nut as there was no thread. So, it wasn't like the Nut escaped it was never there.

John

jallen wrote:The front sprocket came off the shaft a few weeks back when I was doing about 40mph. Luckily it didn't do any damage but it did take 5 hours for a recovery truck to arrive which wasn't great. It was fairly obvious at the side of the road to see what had happened as the chain was very slack. Didn't stop the AA chap wanting to jump start the bike for some unknown reason.

Bought an M18 1.5 Die Nut and managed (hopefully) to sort out the output shaft thread. I have a new nut and lock washer fitted and it took the correct torque setting.

After I got the bike home I found a scrap of paper in the paperwork that came with the bike that said when the Chain and Sprockets were replaced they didn't fit a Nut as there was no thread. So, it wasn't like the Nut escaped it was never there.

John

John,
I would say you had a lucky escape, are you coming down sunday morning to the ACE Cafe' for YAMAHA day?

I was amazed it just slid cleanly off the shaft without jamming the wheel up or smashing the cases/me up etc. Hopefully with a decent thread and the revised nut and washer it should be fine now.

As discussed on another thread I have made a note of what I did to repair it in case I ever sell the bike.

Can't really make the Ace Sunday morning as I am away in Liverpool Saturday/Sunday morning.

with proper chain alignment and slack adjustment, the countershaft sprocket really doesn't need a nut. I would rather NOT put one on, than put a stripped or damaged one back on. I think it can cause more damage coming off than not being there


That's not saying that it isn't good insurance.....

But, lots and lots of bikes use a circlip as a countershaft sprocket keeper and the sprocket is free to slip back and forth a ways

I think the biggest mistake made is in not replacing the locktab washer

reelrazor wrote:with proper chain alignment and slack adjustment, the countershaft sprocket really doesn't need a nut. I would rather NOT put one on, than put a stripped or damaged one back on. I think it can cause more damage coming off than not being there


That's not saying that it isn't good insurance.....

But, lots and lots of bikes use a circlip as a countershaft sprocket keeper and the sprocket is free to slip back and forth a ways

I think the biggest mistake made is in not replacing the locktab washer

It took 6000 miles and a slightly too slack chain for it to come off without one fitted. The thread cleaned up fine and the nut was new, I also fitted the locktab washer and torqued it up correctly. So, hopefully it will be okay. It was suggested an alternative would be to spot weld the sprocket on.