M750 Scrambler Project

[koko64]

Do you mean Mikuni TDMR40 carbs?

[greenmonster]

No, Yama TDM 850 w CV carbs.

[koko64]

No, Yama TDM 850 w CV carbs.

Ah I see. I have a few sets of CV carbs, but the oil heater plumbing and lack of response really annoys me. The carb freezing issue and the solutions required add complexity and clutter. The FCR carbs are sophisticated  in design but simple from a maintenance perspective, don't freeze and are the best carburettors money can buy. The issue is cost, so I found a cheap way of fitting FCRs with a choke.

The best performance with a choke are the TDMR carbs or what I've done, but I think the BDST38's for the TDM 850 at least have accelerator pumps which is what Ducati should have done. With accelerator pumps we could tune the midrange for smoothness and economy and let the pumps take care of acceleration. Alas, Ducati put the cheap ass version of the carbs on desmodues and the rest is history.

[koko64]

Thanks to all of you who have provided advice and encouragement. I can say that this project is pretty much complete, bar a few little touches. The bike is quite versatile and fun to ride and my mates say it gets through rough back roads quite quickly enabling me to keep up with fancier stuff. The bike already is associated with many fun memories with the pillion in a million.
I really appreciate your contributions. This is a great community with friends I hope to meet one day. I've met quite a few people in person both local and from overseas. Stay safe out there.
Cheers.

[Howie]

And cheers to you   Congrats on a great real world build!

[koko64]

Thanks Howie.

[greenmonster]

Thank You.
You're one of the most helpful here.

[Duck-Stew]

^^^

Yup. I agree with that.  I think it's great that you took an Italian street bike and changed it to what you want.  Big kudos!!

[koko64]

Thanks fellas.

[koko64]

Reviving/updating an old thread.

The scrambler M750 has been a great bike and the GLW and I go everywhere on it. The Pirelli MT60RS tyres are a great utility tyre giving confidence on dirt roads and busted up tarmac. We were riding back through the The Black Spur in Victoria when we were hit by a very heavy summer rain storm impeading visibility. The rain was so heavy the roads couldn't drain and we got through it all carefully at 40-45 mph. They are good rain tyres.


0012185_pirelli-mt60-rs_370 by Tony Kokonis, on Flickr
Above, the Pirelli MT60RS currently on the scrambler M750. They are my third pair in 26,000 kms and work well, but Pirellis are very expensive in Australia. Since my circumstances have changed, I'm going to try the Metzler Karoo Street (below). The Metzlers are a hundred bucks cheaper per pair. I'll report on how they go.

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

[koko64]

Scrubbed in the Karoo Streets, about 100 miles, then another 50 with a pillion.

If the Pirellis are 80/20 road/dirt tyres then the Metzlers are 70/30. The Metzler rear has a compliant feel to its ride quality. I think the Pirellis do allow more confident high lean angles on tarmac while the Metzlers felt more secure over bumpy and broken roads while transitioning through moderate lean angles. The Metzlers had a slight edge on my 40-45 mph dirt and gravel test road.

Both tyres felt better on tarmac with a pillion. That might be because this road and track rider hates the tread block squirm of dual sport tyres. If someone else has an explanation im curious to know. Maybe the Good Lady Wife's 100 pounds, when added to my 200, just flattens the tread out a little or settles the suspension with these tyres. I had the same feeling with Pirelli MT60RS but not with regular sport bike tyres. I have no other explanation.

Both are good tyres, but again the Metzlers are about a hundred bucks cheaper a pair here in Australia.

[Charlie98]

I wonder if the additional weight helps keep the carcass in more uniform shape.  Off-road, or dual-sport tires in general don't have very rigid carcass, at least compared to a true road tire, let alone a sport tire.

[ducpainter]

I wonder if the additional weight helps keep the carcass in more uniform shape.  Off-road, or dual-sport tires in general don't have very rigid carcass, at least compared to a true road tire, let alone a sport tire.

Not much experience with Michelins...eh?

[koko64]

My early Monsters back in the day used Michelins and Dunlops but I forget. Remind me. I only remember the difference between Michelin and Dunlop slicks.

[ducpainter]

Michelins are so soft you can mount the first side by just pushing them on with your hands, Dunlops are like iron in comparison.

I haven't used anything but Michelins for the past 20 years.