Confirmation on carbed Supersport Chassis

[koko64]

The SS chassis takes all the motors from 400 to 900 correct? It seems only the swingarm, exhaust headers and rear wheel changed for the 900 besides 900 running gear.
My kids could be buying a 400SS. Just thinking about latter 900 conversions when they achieve full licences.

[Speeddog]

I'm no authority on SS's, but AFAIK, it's as you said.

From what I remember in some of Brad's stuff, there's both small and big diameter headers amongst the sub-900 SS's.

[koko64]

This one comes with twin headers and twin Superlight style upswept carbon pipes. Looks a good little jigger bar cosmetic fairing cracks from newbie falls.

[ducatiz]

all of the SS frames are the same.  there were some slight differences in the later carbie frames (97? up?) to account for the weld cracking issue.

differences were the rear wheel, swingarm, headers and forks and of course the motors. 

900 motors came in big valve only, the monsters had small valve.

SS900 models had the same heads

750/600 and 400/350 models all only had one valve size each. 

400ss is pretty unique, shame to lose it.  the mini-SS models were only in a few countries.

I upgraded my 600ss heads to 620 heads (big valves) for the FCR upgrade.  It went from about 45hp to who knows?  noticeable difference.

[clubhousemotorsports]

The early small case motors used spacers in the frame on the right side as the motor mounts were narrower. In the US the frames were the same so if you wanted to drop in a 900 or post 98 small case motor you could just ignore the spacers and they dropped in. I believe the 400 is the same as the early 750 cases in size so you should see the spacers on the belt side between the frame and motor.

[Nekkid Tim]

400ss is pretty unique, shame to lose it.  the mini-SS models were only in a few countries.

When I retire, I want to build an ultra lightweight based on the 620; I had a 2003 620 Sport that was sold to help fund racing, and I loved the motor.  If I can afford a Ti frame, I think it could be a street-legal remedy for my 20+ year SuperMono fever!

[ducatiz]

When I retire, I want to build an ultra lightweight based on the 620; I had a 2003 620 Sport that was sold to help fund racing, and I loved the motor.  If I can afford a Ti frame, I think it could be a street-legal remedy for my 20+ year SuperMono fever!

Go ahead and buy the 620 motor and start milling it.  You can get a frame made any time.  The milling of the weight off the factory motor is the biggest pain.

I have a 620 bottom in my garage.  I may someday do the same.

[clubhousemotorsports]

Just start with a 696 lower end it is lighter to begin with.

[koko64]

Thanks to all you blokes. Love this place.

We are checking out a 92 400SS tomorrow. Kids are excited. If they buy it I will look for a 900ie motor for a long term project for when they graduate to larger capacity licences. Being an SS I would commit to a short manifold split carbed motor but building the motor in two stages of tune as the kids gain experience.
Stage one will be with stock flywheel and heavy clutch, long manifolds, stock CV carbs with stock closed airbox. Nice and slow. The 900ie flywheel is nice and heavy .
I will add short manifolds, split flatslides with light flywheel and clutch for stage two. Down here the frame/chassis is the bike like a car, so to my knowledge any year motor installed can be carbed if the frame is a carbed bike.
Cheers.