Trying to carb a 2002 750 motor! yes Many Questions

[terse750]

I have a 2001 m750 with a beat up motor at this point. 40,000mi or so on the motor and has been neglected in the valve area.  Well all that fun has caught up to me! One crankcase leak behind vertical cylinder. One stripped head for exhaust mount. Knocking valves from a botched belt change. Apparently the belt slipped a tooth and I ran it with a few high revs etc. Been downhill from there. Only way she fires is with some E3 plugs although after a few miles the horizontal fouls.
Found a deal on ebay exact motor replacement...cheap 12,+++mi  Bought_Paid_Shipped_damaged in shipping!!! feeling like I just lost half my chips in poker...I made a poor mistake and pulled the trigger 2002 750 motor! Whilst not doing my homework!!!
So what can go wrong?

1. Motor Mounting Issues?
2. Carb Mounting
3. How do I convert the ignition system (wires are different and pick-up location) what phase systems?
4. Any other problems that I haven't thought of yet?

I'm trying to run a 2002 750 FI motor on my FCR39's and ExactFit coils.
Got to much invested in the carb and mods and to go full fuel injected would cost way more and waist my carbs! (I think?)
Worst case I was thinking I could use the heads, pistons and any other bits I may need down the rode.
Am I pissing in the wind? It sure feels that way

[ducpainter]

You are kind of pissing up a rope...but you might be able to pull it off.

The cases will bolt right in.

You should be able to use the manifolds from the carbed engine if the fuelie tubes are different.

The ignition is where you're going to have troubles/expense. You can try to change over the old ignition parts, bit I'm not sure if the cases are drilled for the ignition pickups, or if the crank is different and wont accept the old style flywheel which triggers the ignition. You'd have to look inside the left side cover.

An alternative is to buy an ignitek ignition and run it off the timing pick up that triggered the ecu on the fuelie motor.

[koko64]

A few guys here have run the Ignitech with carbs on EFI motors.

Why don't you sell the 750 motor and buy a 900 motor if you are going to the trouble of a conversion? That's a lot of trouble for the same power. Might as well sell it on and get the correct 750 motor. A 900 carb or 900ie motor + hi comp pistons with your FCR39s would be a cool combo. The 900ie motors have hot cams from oem. A 900 carbed motor would be quite straight forward in comparison. It's worth fitting the hi compression pistons and heavy duty engine studs on the 900 carbed motor, the power and torque increase makes for a very satisfying street engine.

[terse750]

That sounds like great advice Koko64!
It's not worth the trouble for the same power. I might just have to eat a bit of a loss but in the long run I do want more power...who doesn't?!
I'll need to look into Ignitech. The site is strange, hard to get clear info.

So If I get a 900i.e motor what other conversions would be needed (other than Ignitech)?

[terse750]

Would a 900ss motor be a good fit?
Do they compare to the 900i.e. hot cam or better?
Mounts the same?
Not a whole lot to choose from on ebay right now. Especially carbed. But it sounds like I may need to go with an EFI motor.

[terse750]

Thanks for the info Ducpainter,
I have read somewhere on here that the flywheel may be a different size(more or less teeth). Which likely puts other pieces to be subject to being changed.
I think Koko64 is right I need to upgrade!
Question is what will I find in the next few months?

[terse750]

yep me again,

How do I set up Ignitech with carbs on a EFI motor?
Plug and play? That would be to easy!

[koko64]

The 900 carbed motor will be the easiest so if you can find one with low miles would be great, but not that easy. 900ie motors be they Monster or Supersport are the same and are three phase electrics like your 2001M750.
They will fit and need the Ignitech ordered  to suit pm ducatiz to confirm as he has contact with them. Then you may be tempted to get a larger rear wheel.
Putting hi comp pistons in a carbed 900 requires new engine studs, especially older motors pre 98. This is essential trust me.
There may be some work linibg up front and rear sprocketss but not difficult and its been done before. The search mode us the tool you need. On injected bikes you will need to play with manifolds to fit your wonderful FCRs. I dont know if 900 manifolds bolt straight on but someone here will. A carbed 900 motor often comes with manifolds. All carbed 91-98 Supersport motors are good but non S model carbed Monster motors from mid 96-99 have tame cams and small valves. See bikeboy.org not all 900 motors born equal. That guy (Brad) saved me from buying a low output motor. Look for V stamped on the heads and not W.
Even a stock 900ie motor goes good but will be more trouble to fit. If you opt for hi comp pistons you will need the Ignitech snyway to change your ignition timung.

There are even modified 900 Monsters around ready to go.

[terse750]

There's only one carbed 900 motor I can find and it's not the best candidate.
Looks like I may be trying to work with the 2002 motor for now. I'll have it in hand monday or so.
I will certainly keep my eyes open for a sweet 900. I'm sure I'll be back very frequently with more questions.

I have a 5.5 rear rim already one of many mods. Always tinkering...
-1front
46t back
pod filters
CA Exactfit coils
Carbon GPR cans chopped to 9"
Barnett clutch plates
Oberon slave cylinder
Keihin 39 Carb kit
upgraded rectifier
Lots of custom paint
more cosmetic mods also

Yeah, I probably have way to much time and energy in her to walk away any time soon.

[ducpainter]

FTR...my 96 Monster is oil cooled and big valved. I think that change was in 97.

[terse750]

My approach will be to crack the left cover on both motors and see whats what first.
Just ordered some better tools for the work ahead.
HF torque wrench and some pretty basic shop tools is what I have. (Grinders/ cutters/ sockets etc.)
So I ordered a Micrometer, proper torque wrench, shim feeler gauges and alt cover puller. I know I will need more.
I'm willing to drill the case if needed for pickup wires but my fab skills and tools are next to zero.

After that, if I can't get more clear info on Ignitech TCIP4 I will pull heads and adjust the valves. Maybe research polishing heads and pistons? Figured if it's opened up, why not?



Just put in some fresh plugs (E3.36 with no adjustability at all, and a small gap) and she runs but I know it's temporary.
This is my third set of these plugs in the last few months. Last set lasted 60mi before fouling the horizontal cylinder.

I'll post when I get the motor and more info

[koko64]

Honestly, don't polish the heads or pistons unless you really know what you are doing. You can clean up the carbed inlet manifolds to remove the rough casting dags and sharp edges. Leave a nice satin, machined finish similar to cylinder bore cross hatching.
If your buddy is skilled, get him to port the heads and do a good valve job for you and you can dig a trench for him or something. If you are like the member Nibor, you can buy high comp pistons for the 750 from FBF on a Monday at a good discount. Get a light flywheel from one of our sponsors and it will be a nifty little jigger! If your buddy can do it and you are short on cash, you can get the flywheel machined down to help response and acceleration. Just some suggestions.

If I'm not mistaken, Ignitech can wire up a unit to run off the fuelie pick up that's plug and play if you request that. I pmed you the name of a forum member whom appears to have good contact with the factory and can chase that up for you. He can confirm if that's possible.




#"Dag" original old Aussie slang for shit stuck to the wool around a sheeps ass.

[terse750]

I have the 2002 motor in hand. Been in contact with ignitech and they seem to think they have what I need. However there does seem to be a disconnect possibly due to a language barrier maybe... I pmed Ducatiz and he says the flywheel and pick-ups will need to be converted for ignitech to work. I hope it is that easy!!! Swap flywheel and pick-ups, plug in the Ignitech TCIP4 and...BOOM? Or Brap!

[koko64]

If you have to change the flywheel, may as well put in a light one .

[terse750]

Oooooh this forum is like the motorcycle buddy I never had! 
Shit but aren't those things like 300+change? 
How much pep will it and to my step? Is it worth the $

Same question for HighComp pistons... I know its a 750 dog but will pistons and alum flywheel be worth it?

Believe me, I'm game for making this Duc purr if someone can twist my arm juuussstt a bit. (trust me... it won't take much)