Re-ring or not FZR1000?

[coops]

Having to strip my FZR to get to a tranny problem. But unfortunately with these bikes the barrels must be removed so you can split the cases
All stripped and im extremely impressed with the pistons/bores. They look and measure up like new. The bores are actually 1/100mm undersize! and the pistons are worn 1/100mm. so clearance is new spec. Should I re-ring and hone while im there? Or am I just waisting my money? Could I hand skuff bores with fine wet and dry and use old rings? or could I just reinstall as is?
I don't mind spending the money but I don't like waisting it either. Already costing over 1K to fix tranny problem. Bloody gasket kit is $350.
Bike done 40,000kms. Has cast liners and chrome rings. Bit of a weapon.
Havent checked ring end gaps yet.

[AllanB]

Given the effort required to pull it down to date if it was mine I'd throw some new ones in and lightly hone the bores. 40,000 kms is nothing - I'd expect it to look sweet in there.

[pete376403]

What is the transmission problem? My sons FZR1000 had troubles jumping out of gear. I replaced the whole cluster with a six speed out of a (IIRC) FZ750. Virtually dropped straight in (some very minor mods were needed to the oiling tubes)

Made quite a (good) difference to the way it accelerates.

[Akzle]

id hone just to get the hatch going. I like hatch.

Rings and shit? I doubt youd gain much except the comfort that theyve been done.

[nzspokes]

Another way to look at it is, do you want to pull it down again if the rings dont work out?

I just couldnt put it back together with old rings no matter how good they are.

[coops]

Given the effort required to pull it down to date if it was mine I'd throw some new ones in and lightly hone the bores. 40,000 kms is nothing - I'd expect it to look sweet in there.

Your probably right.
Cheers

[coops]

What is the transmission problem? My sons FZR1000 had troubles jumping out of gear. I replaced the whole cluster with a six speed out of a (IIRC) FZ750. Virtually dropped straight in (some very minor mods were needed to the oiling tubes)

Made quite a (good) difference to the way it accelerates.

Second gear, gear wheel is pressed on the end of the shaft, no key, no spline, just pressed on. Durrr. well its spinning up at max torque rev range.
So gotta press new gear onto new shaft. Now that its seen, dogs on fifth wheel are rounded and worn(engages second) and same shift fork is bent. Must have been very close to jumping out of second gear. (very common problem on FZR 1ks)
So will have to backgrind gear dogs as well as replace 2 gears 1 shaft and 1 shift fork. The parts aren't that expensive if your patient.
Have to do the valves as well (slight weep with the solvent test) That's ok though. Its the valve re-shimming im not looking forward too.
Thought about the six speed conversion before. If I could find one Id probably go for it. Its such a torquey motor, doesn't really need six gears.
Probably will do the rings.
Thanks

[carburator]

Second gear, gear wheel is pressed on the end of the shaft, no key, no spline, just pressed on. Durrr. well its spinning up at max torque rev range.
So gotta press new gear onto new shaft. Now that its seen, dogs on fifth wheel are rounded and worn(engages second) and same shift fork is bent. Must have been very close to jumping out of second gear. (very common problem on FZR 1ks)
So will have to backgrind gear dogs as well as replace 2 gears 1 shaft and 1 shift fork. The parts aren't that expensive if your patient.
Have to do the valves as well (slight weep with the solvent test) That's ok though. Its the valve re-shimming im not looking forward too.
Thought about the six speed conversion before. If I could find one Id probably go for it. Its such a torquey motor, doesn't really need six gears.
Probably will do the rings.
Thanks

I pretty much have a complete yzf750R gearbox kicking around somewhere in the shed, some of the parts are still in Yamaha
factory wrapping, id have to dig out the list of part numbers.

[ducatilover]

If it measures so well, I personally wouldn't dump new rings in.
It's not as simple as just slamming a hone down it like people think, you need to be a bit decent at it to get the correct angle of the cross hatching, otherwise you'll be wasting your time.
Ultimately, it is up to you.

And six speed conversions are very cool.

[Paul in NZ]

If you source the parts out of the USA they cost a 1/3 of the local price.

Personally, if it was going well I'd leave well alone but would thing about cleaning up the head and refacing the valves.

[pete376403]

When I did the 6 speed I also gave it a valve grind (tiny wee things they are) - real easy to do. You really don't even need a spring compressor because the springs are pretty soft - appropriate to the sizes of the valves I 'spose. Shimming was easy as long as you're methodical. Assemble it all, measure and write down the clearances, pull it apart, measure the shims and work out what you can swap and what you need to replace.

Good set of metric feeler gauges and a metric micrometer and you're in business. And a good torque wrench. I've got a Haynes manual if you need it.