1100F Forerunner

Posted: Mon Mar 06, 2006 1:07 pm

Ya Gotta Love That 'Custom' Pipe!

Mike

Posted: Mon Mar 06, 2006 1:35 pm

is it a chinese bike?

Posted: Mon Mar 06, 2006 1:48 pm

i really like the R tank!

Posted: Mon Mar 06, 2006 3:53 pm

LOCKABLE SIDE COVERS!!!!!!

Posted: Mon Mar 06, 2006 3:59 pm

Shaft drive 2 stroke?

Posted: Mon Mar 06, 2006 4:14 pm

chain covers

Posted: Mon Mar 06, 2006 4:42 pm

firemun59 wrote:

is it a chinese bike?

MZ was East German bike, quite advanced by comparison to its' iron curtain competitors. Made decent MXers back in the day.

They still are in business: http://www.motorradna.com/

Posted: Mon Mar 06, 2006 4:43 pm

831100F wrote:

Ya Gotta Love That 'Custom' Pipe!

Mike

Cool bike, is it for sale???

Posted: Mon Mar 06, 2006 5:06 pm

nosralt wrote:

firemun59 wrote:

is it a chinese bike?

MZ was East German bike, quite advanced by comparison to its' iron curtain competitors. Made decent MXers back in the day.

They still are in business: http://www.motorradna.com/

Quite advanced? They came up with high tech two stroke as we know it. They developed a crank case carburated GP racer that had no equals at the time. But East German racing program was prettymuch non existent due to lack of funds. One of their top designers jumped ship to Suzuki with all the plans. If it wasn't for MZ, the Moto GP world probobly be all four strokes.

Posted: Thu Mar 09, 2006 12:01 am

7Eleven wrote:

nosralt wrote:

firemun59 wrote:

is it a chinese bike?

MZ was East German bike, quite advanced by comparison to its' iron curtain competitors. Made decent MXers back in the day.

They still are in business: http://www.motorradna.com/

Quite advanced? They came up with high tech two stroke as we know it. They developed a crank case carburated GP racer that had no equals at the time. But East German racing program was prettymuch non existent due to lack of funds. One of their top designers jumped ship to Suzuki with all the plans. If it wasn't for MZ, the Moto GP world probobly be all four strokes.

You are quite right my friend! I didn't know how far to go into 2 stroke lore for a group such as this. I think that a ring-dinger restorer like myself might bore/annoy people here! I try to keep that side of me hidden somewhat here just to be on the safe side. I was in the chat room one night with a few members of this board talking away, when I mentioned my dirty 2 stroke side. End of conversation! I took that as a lesson Wink

Posted: Thu Mar 09, 2006 2:47 am

Put 'er in 'the great beyond' and let 'er rip. Razz

Gord

Posted: Thu Mar 09, 2006 4:12 am

You need not worry about me ever asking to borrow this one but I am sure it too has a Mother that loves it; if it is lucky.

Wire wheels & a two stroke: Does not sound low maintenance to me, but still nice in a kind of commie stone axe kind of way. I'm sure it was great at getting to and from from the local grocery store when the only thing on the shelves was the latest edition of Pravda.

It was a defecting to Japan MZ East German Engineer that allowed Suzuki to rise to dominance in GP Racing with two-strokes over Honda's four-strokes in the late 60s was it not?

I vote we move this little, auh, gem to "The Great Beyond" as well.

Is that two-stroke bean oil I smell?

Posted: Fri Mar 10, 2006 7:20 am

Matt at PSB wrote:

It was a defecting to Japan MZ East German Engineer that allowed Suzuki to rise to dominance in GP Racing with two-strokes over Honda's four-strokes in the late 60s was it not?

I was gonna mention the MZ's hand in Hondas CBX failure, but love is blind and I'm outnumbered by Honda lovers Shocked

. So yeah, after the east german tweaks to Suzukis, the 250 CBX just wasn't fast enough, and it's previous victories I'd acredit more to Mr Mike "the Bike" himself. Honda tried making the super oversquare short stroke V-8 to rev twice as fast as the two strokes, thus making up for the extra missing boom in between, but FIA could care less for V-8s. So the NR (Never Ready Razz

) was born by shaving V-8's cylinder walls into oval pistoned V-4. And we all know how that turned out Rolling Eyes

This is more for the great beyond, True.
Though Nosralt,
I don't think people hate two strokes here. There are quite a few old jap bike nuts here, and those who have been around long enough to live in the two stroke golden age, have some collections. Somwhere in polls there is a long thread with bunch of members listing their bikes, some good readin'

P.S. I'll just brag a little and say that couple of weeks ago I had a chance to grope an RZ500 upstate NY. Honestly the first one I've seen in US.

Posted: Fri Mar 10, 2006 2:23 pm

Slight terminology error.

IF the pictures we all have seen of the pistons from the NR are true,the shape is not an oval. It is a radius on each end connected by straight sides. This is not a true circular section and is/was destined to failure by stupidity. IF the piston shape was a "true" oval it would be more correctly called an ellipse and is a true circular section. This shape is machinable by conventional means using an "oval" chuck on a lathe,now days by computer CNC machine,at least my CNC can cut an oval. Since you have a true circular section,the rings,the critical part,could have beeen cut with the gap at the small end. Reversing top and second ring would have put the gap 180" degrees apart and at least had a chance to seal. Same true for a three piece oil ring.

The only people that could truly answer this question is one of the few owners of the production oval pistoned bike,I forget the ID,but it was really expensive and collectable,probably never ridden.

Meanwhile the reason for the oval piston in racing was ignored and the thought that comes to my mind for a production bike comes from a commercial "Wow,I could have had a V-8". Nothing like loosing sight of the forest for the trees.

Posted: Fri Mar 10, 2006 3:38 pm

sonicrete wrote:

Slight terminology error.

IF the pictures we all have seen of the pistons from the NR are true,the shape is not an oval. It is a radius on each end connected by straight sides. This is not a true circular section and is/was destined to failure by stupidity. IF the piston shape was a "true" oval it would be more correctly called an ellipse and is a true circular section.

The only people that could truly answer this question is one of the few owners of the production oval pistoned bike,I forget the ID,but it was really expensive and collectable,probably never ridden.

.

Several slight errors!

Befor we call another degreed engineer who is able to get a job at and works (or worked) for arguably the best small engine manufacturer in the world, stupid, we need to consider the following:

For one thing, an oval is not an exactly defined geometric shape.

In geometry, an oval or ovoid (from Latin ovum, 'egg') is any curve resembling an egg or an ellipse. Unlike other curves, the term 'oval' is not well-defined and many distinct curves are commonly called ovals.
One of them is two semicircles that are connected with straight line segments.

Which means, the Honda piston would be an "oval" piston

Then: The Honda Oval piston WAS NOT two semicircles connected by straight lines. The sides of the pistons were ever so slightly curved to the outside.
I have pictures of the NR750 piston that will clearly illustrate this. I will be glad to e-mail pictures as I can still not post any.

What do I know about it?

Well, I am helping a couple of guys putting a motorcycle museum together and one of the exhibits is a NR750. Sitting here and not being able to check the records, I am guessing it is a 1993.