Frame Up Monster Build

[NAKID]

It checks the box on being a dry clutch and being a true aircooled monster.

Not entirely true. The 900 was oil cooled as well as air cooled. Splitting hairs though

[ducpainter]

Not entirely true. The 900 was oil cooled as well as air cooled. Splitting hairs though

Not all of them. They did away with the oil cooled cylinders ay some point...maybe with the W head models?

[Duck-Stew]

1998 was the last oil/air cooled 900's.  Heads were both 'V' and 'W' so no difference there.

The 900 engine is what it is.  I'm not going into it as it's entirely personal.  You will, however, have to modify the crap out of the swing-arm pivot in order to get it to work on a narrow pivot frame with a narrow pivot arm (SF and 1098).  There is NO getting around that.

I'm sure somewhere there's a thread detailing how to do that.  I have *NO* dimensions and *NO* experience doing this.  The 1 time someone asked me to do it, I farmed it out to someone and the results were beautiful.  That was 10 years ago.  If it were me, today, I'd just buy a narrow swingarm pivot case and de-stroke the crank until I got the power I wanted.

Again, 900 engines are what they are.  There's a definite reason they don't use them anymore.  Actually, several reasons.  YMMV.

[Duck-Stew]

Why not pick up a Hyper796 and start from there?  The dry-clutch conversion is available and the power will be on par with a 900 once proper fueling has been established...

[TitanMonsterS4R]

Why not pick up a Hyper796 and start from there?  The dry-clutch conversion is available and the power will be on par with a 900 once proper fueling has been established...

Hm......might not be a bad idea. What frame will the 796 fit into? Sorry if its a novice questions

[koko64]

If you're buying here, then a HM1100 will be less expensive. Just sayin'

I pmed you regarding grunt for tight roads and razor sharp handling. Torque beast, lightweight, razor sharp handling, dry clutch, simple air cooled desmodue = M1100

[koko64]

Not sure, but if the bike is to ride here on tight mountain roads then peak power is not the consideration, but you want usable torque down low, that and our very strict road laws.

Titan might have been impressed with the real world grunt of an M944 with FCRs when riding the Reefton Spur down here near Melbourne. Now days, the most expensive part of that exercise is buying the FCRs.

[clubhousemotorsports]

If you are looking for a surgical tool pass on the sf1098 frame as Ducati was thinking chopper when they raked that one out. I had an S model in and we had to turn it on its nose to get the Ohlins to work properly, they were not designed to bend as much as telescope.  I believe the smaller street fighter has better geometry.

I fully understand the smaller motor thing. Yes a 900 is not a small motor but it is the easiest (cheapest) way to get a dry clutch, 6 speed and plenty of fun parts for. you can choose carbs or efi for what ever reason. I will put in a plug for the FCR's as there has not been a EFI bike that makes any cool noises from the throttle bodies like a set of FCR's. You will pay for that with a bit more maintenance and a start up procedure right out of the 70's, but it is pure grin material when you ride.

I  would go 99 and newer motor and get the air cooled cylinders and larger charging system, studs were good and even the crank plugs were less of an issue.If you get the power itch throw a big bore kit in and you have 1000/1100 power, cams are available as well. If you are after a maximum 900 I have a couple 985 motors I would part with but that gets you back to how much motor is too much. This is why I have one 900 built to 950 and one to 853 Power numbers are academic unless you are racing.

[koko64]

Not to thread jack, as I have discussed this with Titan. Any thoughts on a 900ie motor with Ignitech ignition, Hi comps and FCRs? I have thought about doing one of these for awhile now. If viable, would you go with FCRs on short manifolds ala MBP or tandem FCRs on long manifolds? Or is it just cheaper and easier to run the OEM EFI with a PCV/PCIII? Of course it's cheaper. I mean for that snappy response, you cant beat FCRs over earlier injection, or is the "accelerator pump" function on PCVs that good?

[TitanMonsterS4R]

Not to thread jack, as I have discussed this with Titan. Any thoughts on a 900ie motor with Ignitech ignition, Hi comps and FCRs? I have thought about doing one of these for awhile now. If viable, would you go with FCRs on short manifolds ala MBP or tandem FCRs on long manifolds? Or is it just cheaper and easier to run the OEM EFI with a PCV/PCIII? Of course it's cheaper. I mean for that snappy response, you cant beat FCRs over earlier injection, or is the "accelerator pump" function on PCVs that good?

You opened up your home to me when I came down Tony, I'll open up this thread to you. No thread jacking threats here

[TitanMonsterS4R]

I am so partial to a 900 it makes me sick........I've wanted one for a while now and come close to buying a few but the deals fell through. I want FCRs for it but I hate idea of mucking around with them to get the idle right. It's why I have electric RC cars over gas ones. The idea of make the beast with two backsing with the mixture, etc. makes me wanna puke. I appreciate the talent that goes into those who can do it. I just wanna get on it no matter teh weather and ride the piss out of it and not worry too much.

That said, the sound..... . Its why I went dry clutch.

So 99 or later engine
What year 900 or SS frame is best to work with?

[koko64]

You opened up your home to me when I came down Tony, I'll open up this thread to you. No thread jacking threats here

  You're welcome to stay again bro.

[koko64]

I am so partial to a 900 it makes me sick........I've wanted one for a while now and come close to buying a few but the deals fell through. I want FCRs for it but I hate idea of mucking around with them to get the idle right. It's why I have electric RC cars over gas ones. The idea of make the beast with two backsing with the mixture, etc. makes me wanna puke. I appreciate the talent that goes into those who can do it. I just wanna get on it no matter teh weather and ride the piss out of it and not worry too much.

That said, the sound..... . Its why I went dry clutch.

So 99 or later engine
What year 900 or SS frame is best to work with?

Once set up right FCRs are quite stable. They don't freeze and give smack in the back response.
You just gotta pump/squirt em to get started when its cold as theres no choke. Only problem now is that they cost as much as a low km 900 motor down here. Maybe bring a set back for your project or ship a motor back too?

[Speeddog]

~~~SNIP~~~

Any thoughts on a 900ie motor with Ignitech ignition, Hi comps and FCRs?

~~~SNIP~~~

That's what I'd do.
The only thing about that I don't like is the close-ratio transmission on the ie motors.
The no-oil cylinders and 3-phase charging are definitely good plans.

The 900SS that I built for a customer was that, with the standard long manifolds and a Nichols light flywheel.
I wasn't very enthused with the light flywheel, but it wasn't my bike or my money.
Customer was really happy with it, until he bought a 916.....

The long manifolds steal some power from the top end, but they give it back at lower rpm.
Short manifolds and split FCR's are a good bit more work to make happen.
For your riding environment, I'd say the long manifolds would be a better fit.

Not sure how the cost compares in Oz.

[koko64]

Yeah, maybe a Yoyo flywheel or machined down stocker. My old M900 had a stocker machined down to 900gm shedding about a kilo. It was a nice compromise. My mate with an SL944 has a Yoyo and doesn't like it either, he's getting old and wants a stocker . The Yoyo is fine at about 500-600gm when I ride his bike imo. The Nichols is light as buggery from what I'm told.

It would be easier to machine down a 900ie flywheel with no ignition trigger on it?