M750 Scrambler Project

[amcjen]

This is looking really good!

Any thoughts on moving to spoked wheels now that you have one of the discs removed? That would set the scrambler look into overdrive (and overpriced!) since you’d be able to see that front wheel in all its glory from the right hand side.

Alpina has some good choices I’ve found—but addl weight could be an issue vs stock.

Really coming together though, looks amazing.

[Speeddog]

I've not seen or heard a reason for left vs right side on a single disc setup.

I ran my M750 with a single disc for a while, wasn't really happy with it on the left side, but that was the caliper I had....
Looks wise, I like em better on the right, matches the disc on the rear.
And it's easier to inspect as well...

[koko64]

I've not seen or heard a reason for left vs right side on a single disc setup.

I ran my M750 with a single disc for a while, wasn't really happy with it on the left side, but that was the caliper I had....
Looks wise, I like em better on the right, matches the disc on the rear.
And it's easier to inspect as well...

Cheers. I just went with pics of single disc M600/750's I'd seen. It's great to get easy access to the tyre valve, saves me buying a right angle valve. Tight arse Tuesdays

[Speeddog]

Tire valve, there you go, that is a reason.

The standard 5-spoke Brembo wheels are lighter than the 3-spokers.
But they never did a 5-spoke in a 4.5".
And a 5.5" 5-spoker weights ~same as 4.5" 3-spoke.

[GK]

Thanks. 😊 This a budget project using parts already laying around whenever possible.

Sounds like the original design brief of the Monster- raid the parts bin!

Double thumbs up!

[Howie]

I don't know the weight difference, but the older three spoke Brembos are heavier than the later three spokes.

[koko64]

Paying credit where it's due, I got inspired by Nibor's M750. After test riding it and pushing it around the workshop, I was impressed with the lack of weight and the urban enduro styling he chose for the build. Nibor's bike has hi comp pistons, mild porting, FCR39's, Termi's, airbox mods, light flywheel, SS guard and Barkbusters. It was impressive to ride. Nibor has lavished it with IMA triple clamps and risers, adjustable forks, fresh frame and wheel paint and Ohlins rear shock. He put many hours into it and I honestly thought it was a waste of time putting that much effort into a 750, but I was wrong. These motors have a sweet balance that can be worked with.

[koko64]

You were so right about the 750 being a good motor for this application, Thanks Howie.

[Howie]

I do miss the old seven fiddy in NYC traffic.  Ability to run at a lower RPM, less engine heat, and, though I love the dry clutch...  Anyway, is there an economical way to give that bike more rake?

[koko64]

I've raised the front and rear 30mm, maybe I can put the rear back to stock? Or maybe get cap extensions and raise the front another 20-30mm?

[Howie]

19' front wheel 

[amcjen]

19' front wheel 

How would a 19” wheel do on the Monster frame/rake/trail I wonder?  Increased chance of tank-slappers or other weirdness?

[Howie]

Yes, I was being cheeky.  No way would this be a low budget mod.  This could be an interesting topic in it's own thread though.

[amcjen]

I get the ribbing, but am totally down to dig into the possibilities.  As mentioned earlier in this fascinating thread, the original spirit of the Monster is a parts-bin bike that just happened to be magical.  I love thinking about it as a platform, thus my curiosity.

Excited to hear how it does on the dirt roads!

[Speeddog]

My GC900 has a 19" front, even fitted with a TKC-80 it's not very flash on loose dirt and is impossible in deep sand.
My riding buddy with much less dirt experience did fine in the same conditions with the same model tire fitted to the 21" front of his KTM950ADV.
His KTM is a real dirt weapon, for sure.
I ascribe about a 50/50 split between bike and wheel diameter for the loose soil prowess.

I've not ridden with aggressive 17" tires on dirt.
I've ridden street 17" tires on dirt with my monster and you just go slow, but no deep loose soil for sure.

On a dirt road that you wouldn't hesitate to take a car onto, 19" are fine.

I've ridden 2-stroke dirt bikes ranging from 83cc to 400cc in sand, and 4-strokes 175cc-600cc.
Every time I moved to a larger diameter wheel it was a significant improvement in deep loose soil and sand performance.
I never had a bike with a 23" tire, those are probably super in the sand.
They're just so gigantic, it's difficult to make a 'normal' bike with one, and a choice of only one tire isn't so attractive.

I'd do more dirt, but I really would have to work a good bit to make my bike more crashable.
It just doesn't feel like a full or near full tank will survive a hard drop, to me.
I've got a 1stGen tank, so it's the big one.

The clearance between 19" tire and the H cylinder head with the front forks fully bottomed is a problem.
That seems to be the issue on the dual sports starting from Monsters.
Steering head is just in the wrong spot.

This would be *so* much easier if we were in the same hemisphere.