M750 Scrambler Project

[koko64]

A minor update. My spare forks are part of a back log of parts awaiting attention from an overworked chroming firm. So its kinda ok. I will turn my attention to the Ohlins DU440 I want to fit. I plan to take the spring in on Friday for measurement and to get a replacement spring for my weight. The forks on the bike feel too good to be the stock, crappy 40mm Marzocchis, warranting investigation before I spend money on the spare forks. The previous owner was a man of some means and lavished the bike, so this may explain why the forks aren't so bad.

I increased the main jets to 140's which is on the rich side by one step (138's may have been spot on, but I usually go one more for an extra dollop of fuel), even with pods. I trust my seat of the pants dyno and the better fuels here have appeared to have changed a little.

[koko64]

Edit. I had a spare oem seat modified for the bike.  My auto trimmer guy used my feedback from testing on dirt roads and with a pillion.

I looked at a list of work I completed on the bike so far which does not include maintenance. It is substantial yet the bike is quite stock in appearance. I can only imagine the level of work Duckstew, Speeddog, Buzzer and others have put in to build custom bikes from scratch.

Here is a list:

Custom seat mods x2. 1 x modified Sargent seat (solo and adventure riding), 1 x modified oem seat (pillion).
Vacuum tap delete and manual fuel tap (Briggs & Stratton )
Reroute fuel line with Visu filter
Fit fuel hose heat shield tubing

Air box delete, K&N 2780 pod filters with K&N outers
Cut up air box/battery box to support ignition and electricals
Keihin FCR 39 off road carbs
Light Alloy Kaemna Flywheel
CCW Exactfit coils
Staintune exhaust

Ducati Scrambler bars
Fat bar risers (Rizoma)
Gel grips
Single throttle cable mod
Ride height and geometry changes (much experimentation)
Dual sport Tyres (Pirelli MT60RS).
Bark buster guards modified to suit
Enduro style headlight fairing
Exhaust pipe guard
Fork guards
Single front disc and new M/C with braided line, sintered pads
1100 Evo rear 34mm brake caliper with braided line
Adjustable Brembo front brake lever
Napoleon mirrors
MX type indicators with LED globes and LED flasher relay
Trimmed front guard
Shorai battery
Modified DB killers
Lowered passenger pegs
Inlet manifold wrap, oil cooler cover for mid winter
Trimmed handlebar to suit
Extended side stand

Jobs pending or in process:
Respring and fit Ohlins DU440
Fit and test refurbished modified forks
Modify a bash plate and weld on a cut down alloy camping cup to protect the oil filter

Most of the work was bolt on and easy. The time consuming stuff was set up and adjustment of rider ergos and selecting or modifying parts from the spares box. Hats off to those who build frames and fabricate everything. I have always admired those who can shape metal and turn concepts into hard parts.

[Howie]

I also admire stealth modifications that make a big difference.

[koko64]

Cheers mate.

[koko64]

IMG_2757 by Tony Kokonis, on Flickr


New seat, modified to be a stock seat on steroids.

[koko64]

20191213_130428 by Tony Kokonis, on Flickr

Got this from Jeff at Monsterparts today. It takes pride of place on the old girl.

[koko64]

20191213_190129 by Tony Kokonis, on Flickr
Non slip cover for the pillion in a million.
A shout out to Baylesh Upholstery in Montrose Vic Melbourne Australia

[koko64]

 20191213_105159 by Tony Kokonis, on Flickr

Seat is higher but sculpted for both rider and pillion to open the knee angle. Rider can stand on the pegs more easily and push the bike under while weighting the pegs. Seat angle gives the pelvic tilt my old back needs nowdays. I feel more over and forward on the bike, but more able to move around which should help on dirt roads. He did a great job.

[Duck-Stew]

My first Duc was a ‘99 M750.  It wore poorly made Marzocchi front forks.  Years later, a friend of mine also had a ‘99 M750.  His forks, however, were Paoli’s.  Visually, identical except there was a small stylized ‘P’ cast into the inner fork bottom.

Main difference: my Marzocchi’s would blow fork seals if you looked at them sideways & his Paoli’s never did.

Random bit of trivia...  Might help with the project.

[koko64]

 [beer]Thanks for that info. That's very helpful and news to me, so I'll check my spare forks at the suspension shop. The ones on the bike have an "M" followed by a number on them. Must be Marzzochi's However, I found a sticker on them from a tuning house down here which backs up my theory that they have better internals fitted. Im 200 without gear and the forks feel way too good to be stock .

Edit:
The marking I saw was an ink stamp of "M600", so that threw me before I wiped the dirt off. There was a casting of the year 98 mfr and a stylized stamp that looked like a Japanese character. It was not symmetrical and looked a lot like this, "P¡¡\" within a stamped, square border. Not clear to me.

[koko64]

Spare forks aren't ready yet and it will be some time after the holidays.
I note that the suspension is quite good with a pillion, quite planted and controlled, better in some ways than solo.

[koko64]

Anyone applied a rear brake upgrade to these older Monsters? I have warped the rear disc during dirt road riding and could use more power and modulation. What are your solutions?
Edit: Didnt have much luck searching around, but I figure someone has grafted on a stronger caliper and more durable disc. HP Brembo caliper, bigger bore mc, floating disc? 4 piston caliper? Wheel clearance issues?

Hope you had a nice break in Yesterdayland.

Cheers.

[Duck-Stew]

Monster rear caliper has a smaller pad area than SS or SBK calipers do.  That could be a low cost fix.

[koko64]

Thanks Stu. That's quite a nifty, budget fix there. I'll make it my first option. Cheers.

[Speeddog]

I've been running a big piston/pad brembo, OEM rotor and Ferodo Platinum pads.
Pretty sure caiper came off a MTS
Line attaches 90 degrees off, so you'll need a different line.
Feels like a normal brake, instead of a weak simulation