Race Clutch and piston.

[tobydmv]

_MG_8523.jpg

Cant say i've seen a more intrusive piston in awhile. Get ready for detonation. Are you racing that bike or is it for street use?

[Ian B]

_MG_8523.jpg

Cant say i've seen a more intrusive piston in awhile. Get ready for detonation. Are you racing that bike or is it for street use?

It's now an ex-race bike and is just going to be used for parades and possibly a bit of street use too.

[tobydmv]

Very cool Ian. I would love to hear it sometime. I'm not sure i've ever heard a dual plug head in anger. Post some videos when its stomping around.

[bikester250]

For whatever it might be worth, I've owned 250M1S 00007 since 1971. It has a lightened clutch basket too but doesn't have straight cut gears. I think this may have been done by H&H in Tennessee back in the 60's.
Phil

[double diamond]

Hi Phil,
Would you provide some additional specifications on your M1S? I’ve seen pictures of this model in period advertisements. The only notable difference from the standard Mach 1 was Oldani brake hubs and alloy rims. I’ve also heard that they had special connecting rods. What other engine and chassis parts unique to the M1S have you identified on yours? Matt

[bikester250]

Matt,
It has the magnesium Oldani brakes and 19" Borrani's.
The connecting rod might be different based on my memory (it's been quite a while since I've had the barrel off). I've never had any reason to dig into the bottom end.
It has a twin plug head (that may have been done by H&H also) and std valve sizes (40 intake, 36 exhaust).
It is streetable but doesn't want to run below ~2000rpm; the cam in it was given to me by Frank Calder who raced it in CT. If you Google that name+ Ducati, you'll find a video of him practicing at Lime Rock along with cars!
Not sure why the posting refers to it being a desmo.
Here's how it looks these days.
Phil

[double diamond]

Thanks Phil! Interesting to see one actually assembled. Other than the wheels, I’m not seeing any difference from a Mach 1/Mark 3. Looks like the frame was originally red/painted black over the red? Does it have a number stamped on the frame by the battery? Wondering if these got the Berliner treatment with no frame number.
Matt

[DewCatTea-Bob]

[quote= double diamond ...
" Interesting to see one actually assembled.
I’m not seeing any difference from a Mach 1/Mark 3. Looks like the frame was originally red/painted black over the red? "

____ When I first saw the pic, I didn't think there was any enhancing I could do to it that'd be worthwhile,, but after Matt's post, I then thought I'd go-ahead & give it a try anyhow (since this M1S.Duke-model is so quite rare & prized as it is).
So hopefully the pic.processing I've applied, now allows some improved detail viewing.
__ Tank looks like it still has it's original paint, (so it would seem out of place to have had the frame repainted without also repainting the tank then as well).
I wonder what the story is on the shorty-megaphone !?
The front-forks sort-of seem to appear a little short, as-if held-stuck slightly compressed an inch or more. _ Anyone-else think-so too ?


Duke-Cheers,
-Bob

[LaceyDucati]

Bob
The "mega" is a super trap item and as such is not a real mega. It is a straight absorption silencer with an added disc baffle (as seen in the middle). Various guys played around with these on race singles in the UK during the 90's when noise regulations were first introduced. My experience is that for outright performance on a race bike they don't work that well. They also actually don't comply with UK race regulations as they exit the gasses sideways and not to the rear. They were used with more success on enduro bikes.

I think the forks look short because of the 19" wheels and the large tyres fitted.

Regards Nigel

[DewCatTea-Bob]

____ Thanks for your response-post Nigel !


[quote= LaceyDucati ...
" The "mega" is a super trap item and as such is not a real mega. It is a straight absorption silencer with an added disc baffle (as seen in the middle). "

____ When I first saw it in the posted-pic (as fully scaled after clicking on the mini-pic presented on the thread-page),, all I could discern about it then, was that it appeared to be a std.type 'reverse-cone megaphone'. _ However after downloading the pic (so I could then get a good/close fully expanded view of it on my monitor), I could then see that it seemed to be a super-trap type cone-muffler, but wasn't really sure it's an actual 'SuperTrapp' production-item cuz I had never seen a real SuperTrapp that was so short, (and-so thought it might've been some kind of home-made shorty-megaphone constructed with some super-trap pieces).
__ Being constructed like a SuperTrapp, I then of-course certainly agree that it can't be considered as an actual 'reverse-cone megaphone' ! _ However it's clamp-on section (seen prior to the set of baffle-disks), really should qualify as a megaphone, (even-though as a whole, it's not a standard 'megaphone' exhaust unit).



" My experience is that for outright performance on a race bike they don't work that well.
they exit the gasses sideways and not to the rear. "

____ I've only ever seen & heard two std.length SuperTrapp units, (one on a Duke, and another on a XL-Honda),, and all I can say good about them, is that they exploited a nicer than average exhaust-note/sound from them.
__ The SuperTrapp-design is nothing I-myself would ever endorse for advantageous-performance,, as the disbursing of the bullets of ex.gas towards any direction other than straight back, is a certain waste of kinetic-energy ! _ (Even the best of megaphones also do likewise [to a more limited extent, of-course], compared to 'straight-pipes' !)



" I think the forks look short because of the 19" wheels and the large tyres fitted. "

____ Perhaps so,, but even-so, the front-end still seems to appear as if the front-brake is being lightly applied whilst under moderate speed.
(I'd put the notion to rest, if it were confirmed that the forks are actually seen resting at normal length.)


Dukaddy-DUKEs,
-Bob