The rebirth of Lazarus

[K2-K6]

Probably my thinking as looking at 750 concept that has final reduction on output Jack shaft in comparison to 500 that's got reduction on Jack shaft prior to clutch. That's going to switch the gearbox shaft speeds when comparing 500 to 750.

So then looks logically opposite to my previous view.

500 is crank, chain reduction, jack reduction to clutch, clutch shaft to output shaft.

750 is crank, chain reduction to clutch direct, clutch shaft to output shaft, then another reduction to sprocket output.

Think that's how they both go.

[mickwinf]

Hi Ken, it is definitely the left side fork i need, any luck on the other bits? we can arrange a pick up soon.

[Oddjob]

Cleaned up a left fork, that's ready.

Currently I have

2/3rd gear, mainshaft. Not pristine but ok. Some wear showing on the teeth faces but nothing out of the ordinary.
Gear change shaft, complete with spring. Check spring positioning as I forgot which way it went on, 50% chance of being right.
No 10 gear, good condition.
No 12 gear, good condition
No 5 gear, complete with bush, if required.
Countershaft bearing, seems fine.
Countershaft collar, not perfect but should be ok.
Got 2 new needle roller cages on the way, not sure if they'll be the same but worth a look. The outer bearing housing should clean up, it's only the internals which wear as a rule.

Have I missed anything?

[mickwinf]

that sounds like the lot Ken, PM me a price and we can arrange a meet.

[Oddjob]

Couldn't get the needle roller bearings, they cancelled the order saying they had no stock.

Forgot to add, crankcases of course.

No charge Mick, you can pay for petrol if we meet up.

[mickwinf]

thats very kind Ken, i will make a donation to the forum.

[mickwinf]

So it is slow going with Lazarus, not much been happening due to other commitments but some progress has been made. His new crankcases are ready, just need painting and all the gearbox bits are now here, many thanks to oddjob for those. New primary and cam chains and primary rubbers will be fitted and new shell bearings. One interesting thing is i got a gasket set from a different supplier than silvers as they were out of stock, and it did include the rubber pucks which are normally extra. I have also been collecting parts as they come up like an almost mint seat so Lazarus will rise at some point!

[Bryanj]

Just so long as it dont leave a wierd ending like the new tv series!

[Johnny4428]

Great to hear there is progress. Looking back on this post, shit that was one rough bike! Gtreat for the before and after. 🤣

[Seabeowner]

One interesting thing is i got a gasket set from a different supplier than silvers as they were out of stock, and it did include the rubber pucks which are normally extra.

Yep, I've had three sets of 500 and three sets of 550. Various makes. 500s all had them.

[mickwinf]

well i have started to re assemble the replacement crankcases which came off an earlier bike, and i am a bit puzzled by the neutral stopper thingy that screws into the top case and engages with the shifter drum. I always presumed it had a ball that engaged in a hole to give a positive position for neutral, and indeed the earlier version has one, however the later version does not have the ball. So what does it actually do? is it just to keep the shifter drum from moving laterally? At least i am putting things together now!

[Sesman]

Not quite with your there. I don’t think 550 has the top stopper. Least mine doesn’t

[Bryanj]

Its just to locate the drum, there should be a collar on the spigot of the bolt, neutral stopper is then part of the mechanism on the drum end behind the clutch

[Oddjob]

Bryan is spot on. This mechanism was revised by Honda part way through the K0 production run IIRC. They removed the ball bearing and changed the mechanism inside the clutch area for a more positive neutral selection. The upper bolt ends in a thin pin which is too thin for the drum so they packed this out with a small collar which prevents the drum from moving side to side and causing engagement issues.

[mickwinf]

cheers guys, it makes a bit of sense now after thinking about it, what confused me was the drum still has an indent for the ball, just not used on later models.