M750 Scrambler Project

[koko64]

Road testing on bitumen and dirt/gravel was favourable.  The pistons also retract more cleanly reducing the risk of over heating and disc warping. I gave the rear brake a hammering with no over heating or brake fade.

[koko64]

20191231_103932 by Tony Kokonis, on Flickr 

Come to think of it, these later callipers remind me of the old Lockheed Racing callipers.

[koko64]

I have a 10.5 on my Monster with the Ohlins, and I'm under 200 fully geared. I'd think an 11.5, or 12. You might try emailing Eric, or Nick might have notes on a 200 pounder.

The stock spring will be too soft.

I found this Eibach 550 pound spring in a parts bin in the corner of the workshop. Code no. 193336, size 0700.225.0550. Im assuming the 550 means 550 pounds.

[koko64]

  20200103_161928 by Tony Kokonis, on Flickr

Seems to fit ok.

[koko64]

It's 3/4 inch longer than the Ohlins spring. The coils are thicker but less spaced that the Ohlins spring which has lost its numbers. I'll get them measured by my suspension bloke.

20200103_161942 by Tony Kokonis, on Flickr

[koko64]

 20200103_171950 by Tony Kokonis, on Flickr

Amazing what you find when you clean up. I'll visit Kroozetune's suspension shop next week when the summer break is done. Left to right, Showa, Eibach, Ohlins and Sachs. Eibach chart says that's a 9.8kg spring. The Sachs progressive spring is off my old '95 900 Monster, but appears lighter than the Sachs progressive on my 750 (which is great with a pillion, but crap solo) if coil gap is anything to go by.

[Speeddog]

Yes, that Eibach is a 550 lb/in spring.

The Showa spring looks quite stiff, likely as Honda used high leverage ratios on a lot of their bikes.

Allegedly, all of the Gen1 Monster shocks are the same, excluding the Ohlins-equipped bikes.

[koko64]

That Honda spring is off one of my NC30's with the ELF Pro Arm. I raced three of the little buggers, great bikes.

Will that 550 lb Eibach carry my 200 lbs?

[koko64]

I have a 10.5 on my Monster with the Ohlins, and I'm under 200 fully geared. I'd think an 11.5, or 12. You might try emailing Eric, or Nick might have notes on a 200 pounder.

The stock spring will be too soft.

So a 10.5 equates to about a 600 pounder?

[Speeddog]

That 550 is too soft.
That Penske emulsion shock I got from you had a 600 on it.
So if you can remember how that felt...

I'd say something in the 600-650 range, 10.7-11.6 kg/mm.



That would be

Ohlins has a -39 spring that's 11.2kg/mm (628 lb/in).

[koko64]

Thanks fellas

[koko64]

Ordered some bayonet type 9mm LED globes to use in the dirt bike turn signals. They have 360 & 180 deg LED coverage and are twice as bright as the globes supplied which are drowned out by our harsh summer glare. The lenses otoh were excellent at night and made the most of the candle like lumination, they should work very well with LED's. The vendor advised to use amber globes with the amber lenses for more intense lumination.

I had briefly refitted the oem turn signals but the GLW's pillion boot missed them by mm's (I note my ex wife kicked them off regularly). Then there's the vulnerability of the oem indicators on dirt tracks and how they protrude like the proverbials, my original decision vindicated.

[koko64]

http://www.ducatimonsterforum.org/index.php?topic=77926.0

Next for this bike are two FCR MX 39 carbs on modified manifolds. These dirt bike manifolds have horizontal carbs with a choke.

[koko64]

12v-24v-BA9S-AMBER-LED-360-led-shop-online by Tony Kokonis, on Flickr

LED indicator globes.
But you need this. Two similar products have not worked with four globes, only two. This product claims to self adjust to cater for any number of globes.

12v-Electronic-Flasher-3-Pin-led-shop-online by Tony Kokonis, on Flickr

[koko64]

0012185_pirelli-mt60-rs_370 by Tony Kokonis, on Flickr
Pirelli MT60RS currently on the scrambler M750. Below are the Metzler Karoo Street I am considering. From initial observation, the Karoos look like a decent dirt road tyre, but I think the Pirellis could be better on wet tarmac. The Karoos cost significantly less.

0016245_metzeler-karoo-street_370 by Tony Kokonis, on Flickr

Any opinions or thoughts from you tyre experts?