refurbished front rotors today

[jono]

Today my used front  rotors arrived from Canada in very good condition  so on they went, straight swap only problem i ran into was the axle it was easy to slid out and reassemble ,The wheel spins freely and smooth the speedo drive was greased and seems to work correctly and the abs is removed so nothing to worry about there . But the axle doesn't protrude far enough thru the fork leg to fit a spit pin I wonder why??? .It never has I've just never noticed it before ,the rear axle has a pin

Jono

[Pat Conlon]

Don't need no stinking pin when you have a pinch bolt.

[balky1]

I think you are pushing in the axle from the wrong side. Holes on the fork legs are not the same.

[Bill_Rockoff]

When I am reinstalling the front wheel, the problem I usually have is that the speedo drive hub moves around while I'm placing the wheel between the forks. This requires extra care to make sure it lines up properly on both its wheel side and its fork side.

https://www.bikebandit.com/oem-parts/1991-yamaha-fj1200-f1200b-front-wheel/o/m146572sch130054

On the wheel side, there are two slots in the speedometer drive hub that are supposed to fit a pair of tangs on part #5 in the sketch above. Those tangs make sure the speedometer drive gear rotates with the wheel. If you don't line the tangs up with the slots, they'll poke against the drive gear and keep the hub from seating all the way into the wheel. This will leave a space between the drive hub housing and the wheel that shouldn't be there; the drive hub housing should seat all the way into the wheel.

On the fork side, there's a slot in the speedometer drive housing that is supposed to slide up along either side of a raised ridge on the bottom of the fork leg. This slot and ridge keep the drive hub fixed relative to the fork, so it doesn't rotate. If you don't line it up correctly, the hub can be rotated a few degrees relative to the fork while you reassemble it, which will cause the fork's ridge to ride outside the slot. This will keep the fork too far from the the wheel and leave a space between the fork leg and the speedo drive unit that shouldn't be there.

Good luck.

- Bill

[Sparky84]

Didn't think there was a hole in the front axle let alone a split pin to go through it   

[Bill_Rockoff]

There's not, stock. There are pinch bolts that keep the factory axle from rotating and backing out.

If you feel like you need to put a pin through an FJ's front axle, you've done something wrong. It could be that someone stripped out the pinch bolt. The solution is definitely to replace the bolt if it's the bolt that's stripped, or to tap it to the next size and use either the next size bolt or install a helicoil / Timesert if it's the fork lower that's stripped.

The 1st gen FZ1 rear axle also has no hole for a cotter pin, but it also lacks any pinch bolt or other mechanism to keep it from loosening. Andrew's bumblebee was off the road for a while because his axle nut went missing, along with the chain adjuster block from that side. When I was babysitting his bikes last year, I ordered a new spacer and bought a castellated nut and a pin for that side of the axle, drilled some holes, and pinned that nut so it wouldn't back out any more.

I took it out for half an hour to test my work afterward, and hoo-boy is that bike fast. I still like riding the FJ1200 more, but I'd like to make the FJ that smooth and that powerful. Or maybe try an R1.

[aviationfred]

The photo of the wheel with the axle in is correct and NO pin is required. I have no idea why there are holes drilled in the threaded end. The front axle on my 1990 FJ is the same. Here is a photo of the Yamaha parts breakdown for the front wheel. No pin is displayed.


Fred

[Firehawk068]

It's for when you strip out the threads on the fork-leg.

You can add a washer, a castle-nut, and a cotter-pin 

[jono]

excellent ill remember that 

thanks Guys

[balky1]

I don't know if it is different on the later years, but on my 1100 axle goes from left to right, sitting on the bike, i.e. from the speedo side to the other side. And I can't push it in the opposite way because holes on the fork legs are not the same.

[jono]

my bike is 1991 abs model A, the axle enters from brake lever side which has a pinch bolt on that side ,it screws into the opposite leg .I now know it is fitted correctly thanks to Fred and Alan

jono