carb conversion

[toaster]

im just curious if anyone has done a carb conversion on a fi bike?  i have a 04 800, and i would really like to make it lose some things (ecu/immobilizer).  just wondering what all is involved in making the switch.  ive done it to a car in the past, but never on a bike, and never anything this new.

all help will be appreciated.

[Speeddog]

Short manifolds and FCRs would be nice.

Ca-Cycleworks may have manifolds, check with them.

You would have to come up with some sort of ignition, perhaps one of the programmable units that some of the carbie guys are using.
I think Ca-Cycleworks has those too.
Not sure what you would do about the triggers, IIRC someone was fiddling with that, as far as using the FI triggers to signal the ignition box.

Perhaps MSD may have a box to do the ignition, their stuff used to be *really* large (car sized) but I think their newer stuff for bikes is small.

[MotoCreations]

Perhaps MSD may have a box to do the ignition, their stuff used to be *really* large (car sized) but I think their newer stuff for bikes is small.

Two ways to do an MSD.  You can machine an adapter to run via the right side cam belt drive.  Pretty simple setup.  Ugly though as you have to build a cover for it. (local guy just did on his 620 with non-MSD parts) Or just machine a new flywheel with correct pickups.  MSD parts are still pretty big though and difficult to hide.

You can go FCR's as they work quite well.  Or just toss the factory ECU setup and go with a 3rd party fuel mapping system and use the factory injectors / manifolds.

[clubhousemotorsports]

funny you should ask.
I converted a 800 for a customer and am still finishing up the bike so i do not have an answer as to how it runs yet.
I installed mostly all oem ducati parts that are available and are reliable.  The bike has individual Kehin FCR carbs as well, on short manifolds.
I am making a wiring harness for it next week and then hope to start jetting the FCR's.
stay tuned.

[Speeddog]

39's or 41's?

[toaster]

You can go FCR's as they work quite well.  Or just toss the factory ECU setup and go with a 3rd party fuel mapping system and use the factory injectors / manifolds.

i was thinking about doing that using a megasquirt setup.  im sure i could get it done and have it all hidden and mounted just like the stock ecu, but i dont know what kind of sensors the bike has on it or whether i would have to swap them out for something different.

biggest reason i wanna do it is that i really really want to make the bike stand out from all the other "new" monsters, but doing that and keeping the stock ecu seems to be a huge struggle since the gauges cant be removed. and im 99% sure i can build and finish a megasquirt for less than buying a power commander, dp ecu, fim ecu or whatever else there is out there.

funny you should ask.
I converted a 800 for a customer and am still finishing up the bike so i do not have an answer as to how it runs yet.
I installed mostly all oem ducati parts that are available and are reliable.  The bike has individual Kehin FCR carbs as well, on short manifolds.
I am making a wiring harness for it next week and then hope to start jetting the FCR's.
stay tuned.

i will be waiting to hear from you about this setup.  i may do the carbs and i may to the megasquirt, but i really want to hear about the setup youre using.

[brad black]

you could probably get the ignitech box to work with the std rotation sensor.  you'd need to ask jan.  much easier than going msd or the like, you'd just need to make up a loom as required to run the coils, etc.

or you could rewire the ecu plug and fit the previous model ss and monster 1.5m ecu.  it's a bit bigger, but is immobilisor free and remappable with ultimap or dimsport packages.

[greenmonster]

or you could rewire the ecu plug and fit the previous model ss and monster 1.5m ecu.

Didn`t know you could do that.
If so, also consider the MyECU:
http://www.cajinnovations.com/MyECU/index.htm
Quite cheap to build & bolt on if you have a spare 1.5 box.
You get software to do your own maps.
Works on Ducs, just fitted a My P8 to my 907.

[clubhousemotorsports]

800 is up and running on the 39fcr's I am heading to the track on thursday to give the bike its shake down runs.

I have a box of brass and I plan on using it. so far it seams to be just fine once I dialed in the low speed jetting on the lift with a CO meter. If I can get some dyno time I will post a run.

I will let you know how she runs friday.

[clubhousemotorsports]

Okay!
today we ran the 800 at the track and after adjusting the needles the fueling was great.  The 8oo with the 39FCR's felt as strong as the 800ie I rode back to back. Fueling was crisp and clean and with the rev limiter removed i needed to remember to shift by 9000rpm.
I would do this again in a second.
The bike should still see a dyno to make sure it is making normal 800 power but it really ran great all day.

[Howley]

There was a guy on another forum who put carbs on a sport classic.

[wbeck257]

Okay!
today we ran the 800 at the track and after adjusting the needles the fueling was great.  The 8oo with the 39FCR's felt as strong as the 800ie I rode back to back. Fueling was crisp and clean and with the rev limiter removed i needed to remember to shift by 9000rpm.
I would do this again in a second.
The bike should still see a dyno to make sure it is making normal 800 power but it really ran great all day.

Want to provide a little more details (which parts, how did you get past the ignition issues, how did you do this... etc?)

[clubhousemotorsports]

Want to provide a little more details (which parts, how did you get past the ignition issues, how did you do this... etc?)

the ignition is oem 900ss kokosan ignition that I fitted to the engine, mostly bolt on. you need to drill and tap the cases but it is not a big deal. We were using a bone stock 800 motor so timing was set straight up (OEM not advanced or retarded).
The carbs were kehin 39mm flatslides that I rejetted to suit the motor and exhaust requirements. This was a custom one off exhaust so jetting may be different for another system. Short intake manifolds were made to get the best intake charge into the cylinders and the carbs are individuals not a bank.

This does not make the best set-up for a street bike due to the lack of a choke and problems keeping the carbs in  sync if you use the idle whips to warm the bike up.

Thats all, not much more to tell. I would be interested in trying one of the aftermarket ignitions next time (yes I plan on doing it again) but to be honest it ran so good I don't expect it to improve much.

[greenmonster]

the ignition is oem 900ss kokosan ignition that I fitted to the engine, mostly bolt on. you need to drill and tap the cases but it is not a big deal. We were using a bone stock 800 motor so timing was set straight up (OEM not advanced or retarded).

Very interesting!
So you fitted the pickups on their bracket under the flywheel?
You used the 800 flywheel, it has timing function as the carbed ones?
Any pics?

[clubhousemotorsports]

The flywheel used was for a 98 900fe.
It has the correct parts all set to make an easy conversion, The only part I needed to make was the spacer for the flywheel. We had it ground down to the proper length.
I would bet that there is a correct one from ducati. Probably from the 98 fe also.

As easy as a 900/750 from the 90's