Oddball engines and prototypes

[Michael Moore]

Yes, the Kawasaki Nessie had SSSA (single sided swing arm) with coaxial pivot, and had both round and box tube versions.

[husaberg]

Yes, the Kawasaki Nessie had SSSA (single sided swing arm) with coaxial pivot, and had both round and box tube versions.

Cheers

So many different nessies but most show the front end only or the para back end.
That 1970's endurance racing was such a fertile breeding ground for alternative chassis design

[WilDun]

One only PUCH to win a MX World championship.

[husaberg]

One only MX World champion! - PUCH.

life in the ol dog yet

[Frits Overmars]

One only MX World champion! - PUCH.

After Harry Everts became MX-world champion 1976, I was offered the opportunity to take his Puch MC250 engine apart. It featured a rotary inlet plus a piston controlled inlet, both breathing through a 32 mm Bing carb.

[Pursang]

I bought a Suzuki TC 90/100 engine that was fitted with a later piston port barrel and ran two carbs, the rotary valve induction and the one behind the cylinder.

Someone thought it might be worth the effort.

cheers, Daryl.

[guyhockley]

Maybe Puch are just one of those companies that like to do things differently. I rebuilt a few VS50 sports moped engines back during the sixteener moped era and they have magneto bearings for the mains and lots of shims as I remember.

[husaberg]

Maybe Puch are just one of those companies that like to do things differently. I rebuilt a few VS50 sports moped engines back during the sixteener moped era and they have magneto bearings for the mains and lots of shims as I remember.

Vrm Roffe uses them in his racing build, so there must be some advantage in using them.
http://www.pvlsverige.se/vrm/index/indexeng.html
https://en-gb.facebook.com/pages/cat...2446397143228/
Yes thats a Disc valve MB5 or NS50

[guyhockley]

Nice work!
The relationship between inner, outer and width for magneto bearings is different to the 6000 etc. series.
We had a motor where a bearing siezed and the shaft spun in it. I used a magneto bearing that had the same OD (can't remember if the width was the same) but a smaller ID so the shaft could just be turned down a bit to fit without having to buy a costly replacement. Ran for years afterwards.
Could be useful for some conversions, maybe?
Wouldn't have thought that was the case in the picture you posted, though, given VRM's capabilities

[husaberg]

Nice work!
The relationship between inner, outer and width for magneto bearings is different to the 6000 etc. series.
We had a motor where a bearing siezed and the shaft spun in it. I used a magneto bearing that had the same OD (can't remember if the width was the same) but a smaller ID so the shaft could just be turned down a bit to fit without having to buy a costly replacement. Ran for years afterwards.
Could be useful for some conversions, maybe?
Wouldn't have thought that was the case in the picture you posted, though, given VRM's capabilities

I wouldn't have thought the tolerances of the running clearance would have been wide enough i cant imagine they come in C3.
But he must have had a reason that said one side of those hondas is a odd size 22mm id 50mmOD or 6228 on the primary , The mag side is the weak side to as its not oil soaked from the primary. although the disc and the cooling flow might help there
maybe the mag bearings give 1/40 of a Hp in less friction?
I don't do facebooky, if you do, you could ask. Roffe.

[guyhockley]

German tuner Walter "Waldo" Nieser just died and one of the pictures posted of him shows him holding a crank with mag bearings!

Couple of other pictures puzzled me. Caveat, I'm looking at these on a tiny, crappy phone screen so hard to see details, but it looks like he may have been using flat heads with no combustion chamber. The water cooled cylinder is definitely unfinished but the head looks done, although I can't decide whether there is a plug thread or not. The caption with it said it was for a Kreidler or Maico.
The air cooled is a Maico, the marque he was most associated with, probably the RS 125.
No pictures of pistons, unfortunately, would they have a bowl in the top, would they be flat, am I chasing rainbows?...

[tjbw]

German tuner Walter "Waldo" Nieser just died and one of the pictures posted of him shows him holding a crank with mag bearings!

Couple of other pictures puzzled me. Caveat, I'm looking at these on a tiny, crappy phone screen so hard to see details, but it looks like he may have been using flat heads with no combustion chamber. The water cooled cylinder is definitely unfinished but the head looks done, although I can't decide whether there is a plug thread or not. The caption with it said it was for a Kreidler or Maico.
The air cooled is a Maico, the marque he was most associated with, probably the RS 125.
No pictures of pistons, unfortunately, would they have a bowl in the top, would they be flat, am I chasing rainbows?...

RIP Waldo.

Rough plug thread can be seen in the last photo, looks like a shallow dome combustion chamber too.

[husaberg]

German tuner Walter "Waldo" Nieser just died and one of the pictures posted of him shows him holding a crank with mag bearings!

Couple of other pictures puzzled me. Caveat, I'm looking at these on a tiny, crappy phone screen so hard to see details, but it looks like he may have been using flat heads with no combustion chamber. The water cooled cylinder is definitely unfinished but the head looks done, although I can't decide whether there is a plug thread or not. The caption with it said it was for a Kreidler or Maico.
The air cooled is a Maico, the marque he was most associated with, probably the RS 125.
No pictures of pistons, unfortunately, would they have a bowl in the top, would they be flat, am I chasing rainbows?...

RIP Waldo.

Rough plug thread can be seen in the last photo, looks like a shallow dome combustion chamber too.

I would say it must be finished doe to the water fittingsd being added, there does indeed appear a shallow dip around the plug
Maybe he was a follower of the Kawasaki concave piston combustion chamber.
Maybe he found it easier to machine the pistons to experiment.

[190mech]

Jan Thiel still talks of magneto bearings on 50cc racers from time to time,it must be a good/adjustable setup!

[husaberg]

Jan Thiel still talks of magneto bearings on 50cc racers from time to time,it must be a good/adjustable setup!

We could ask him i guess.

Most gears in Italy were made by CIMA at Bologna

Jan unrelated to gears, but could you tell us about any advantages of Magneto bearings?
As used here on a crankshaft