My S4R project is finally complete, so I figured it was time for me to actually build something from the ground up.

What is the best frame to work with to build an air-cooled monster with sub 1000cc engine. Understand with most engines its not going to be a straight drop in.

This will take me the better part of a year I imagine to pull all the pieces together.

C'mon Boys and girls let me have it.

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Parts I'd like to use that I have laying around:

999R forks
999R front wheel
S*R SSS
7 inch round headlight

Hmmm. Ill think about this a bit and call you bro.

Carbed 900 or 900ie?

848 main frame custom rear frame  620 or 1100 mts motored cafe racer. Mts 620 swingarm with dual rear shock, sc wire wheels. Monster 1100 headlight, ss600 exhaust.

Sorry didnt see what u had. Switch to ss frame and 944 motor

Looking forward to this. More vicarious pleasure.

Been having a think on it, how much fun could I have using the 1098 SF frame as a base? Am I committed to using a newish engine if I go with that frame?

All I know is this Monster has to have a SSS.....

SF1098 frame is configured for the SBK style swingarm, where the pivot shaft is fixed, and the swingarm has the bearings in it.

That's going to make it more difficult to use the S*R swingarm.

Would that swingarm fit a 900ie motor? I cant remember what cases fit what.

Kinda partial to the SF1098 frame as I can modify the backend easier. Can also find a nice swingarm......

900 engine is a wide swingarm pivot.

S*R swingarm is a wide swingarm pivot.

SF, 848-1198 frames are narrow swingarm pivot.

SF, 848-1198, Hyper & Multi swingarms are narrow swingarm pivot.

Wide and Narrow will not readily interchange.  Yes, some people have done it but it's not a walk in the park.

If you'd like a more modern motor, however, the 1100 motors out of the Hyper or Multi are a narrow swingarm pivot and will make much more power than a 900 will.

Why sub-1000cc?  Any reason?

How about a DS1000 (992cc)? If it's under 1000 for an insurance reason, start there and there are bore kits that will take it to 1080 I think. 100hp and gobs of torque.

Another thing to consider, the shock and pushrod attachment points are different for S*R swingarm and SBK/SF/etc swingarm.

So you can avoid shock/rocker/pushrod aggro by using matching frame and swingarm.

How complicated of fabrication work are you prepared for?

Quote from: Speeddog on May 18, 2016, 11:46:21 AM
Another thing to consider, the shock and pushrod attachment points are different for S*R swingarm and SBK/SF/etc swingarm.

So you can avoid shock/rocker/pushrod aggro by using matching frame and swingarm.

How complicated of fabrication work are you prepared for?

Good points here.  The Multi/Hyper frames are designed for (narrow pivot) 2V engines, SSS arms & they have sub-frames which can be easily modified...

Quote from: Duck-Stew on May 18, 2016, 11:34:44 AM
900 engine is a wide swingarm pivot.

S*R swingarm is a wide swingarm pivot.

SF, 848-1198 frames are narrow swingarm pivot.

SF, 848-1198, Hyper & Multi swingarms are narrow swingarm pivot.

Wide and Narrow will not readily interchange.  Yes, some people have done it but it's not a walk in the park.

If you'd like a more modern motor, however, the 1100 motors out of the Hyper or Multi are a narrow swingarm pivot and will make much more power than a 900 will.

Why sub-1000cc?  Any reason?

Why sub-1000cc - just feel there is going to be too much wasted energy. I love the bikes but I just feel like even with my S4R, there is so so much power I'm not using cause Im not tracking this nor the bike I'm going to create. Want something that is a surgical knife between my legs. Not looknig to cut off my twig and berries but I want it to be nimble/capable or carving the shit out of a twisty road.

I've heard the myths about the 900 engine being so much fun on canyons. It checks the box on being a dry clutch and being a true aircooled monster.

Based on the comments, seems the 900 engine with a SS frame is the best way to go given I also have a S*R swingarm.

Fabrication - Dont mind the fabrication part as I know I'm going to tap local experts for help with some parts. I know my own limits  .

This is good stuff gents, keep the insight coming....

Question - can I put a 900 motor in a SF1098 frame with a 1098 SSS? Or is that just asking for trouble and will look odd based on the dimensions of the 109 engine, etc.