Big bore kit, cams, flywheel, ECU mods for 2000 M900?

[M900GP]

I've done several mods to the body, frame, and suspension of my 2000 M900, but am now considering digging into the motor a bit.  Over the years I've seen posts on big bore kits and cams, etc, so just wondering if there's a place on this board where those mods are posted.  I saw the list of major mods but didn't catch anything specifically for engines, but maybe I missed it.  If anyone can point me toward some obvious posts that would be great.  Would be great to hear from anyone who's been down this path before.

I'm not looking to run the bike on the track regularly, but an occasional track day would be fun.  Mostly looking to continue on the backroads and twistys, so I'm looking for options on mods and tuning, pitfalls to avoid, etc - all for a better performing street bike.  Any recommendations on parts for sale would be great too.

It's a 2000 so fuel injected.  ECU flash, Power Commander, or ?  

Any info on the various bore kits and torque/horsepower gains?

Also heard suggestions for cam upgrades.

Thanks for any suggesions/advice  

[koko64]

IMO hi comp standard bore pistons, open airbox and fueling combination of your choice, ie PCIII and/or DP ecu reflash, etc will give great bang for the buck. That could be stage one.
I would not bother going 944 without porting. Recent dyno experience has led me to this conclusion. Drop in stock bore pistons are cheap, but rebore/replating is expensive (well over here anyway). Instead of the rebore, I would have the heads ported, for my money.

Also consider adjustable cam pulleys and dialed cams. Your bike has pretty "big" cams standard.  With the heads off, I would have them ported and maybe 44mm inlet valves fitted with porting to suit (if you got the money).

Then there are light flywheels and clutches.

Actually, open airbox, fuelling mods and dialed cams could be a more economical stage  one.

Depends how far you want to go. Check these websites, bikeboy.org, Hordpower, Doug Lofgren Motorcycle Performance Service. A wealth of information from these clever (and patient) guys. Look for your model and mods with dyno charts to see what combinations yield.

[Blue]

My 2000 Ducati Monster 900ie:

FIM chip, open airbox with K&N, Forza exhaust and Nichols light fly wheel and stock gearing.  Since the dyno, I have added a barnett clutch basket, clutch and have gone -1/+2 on the gearing.  Also, did the suspension (RaceTech front, Ohlin's rear). 
Thinking about the hicomps, but it does still make me smile.   



I'll be watching this thread to see what you come up with.

[M900GP]

This is great info - thanks!  Very much what I'm looking for.  Curious if others have gone ahead with the piston swap - either at stock bore or over, and what sort of hp/torque gains they added.  I've got the airbox mod and K&N ready to go, and went -1 up front on gearing but left the rear alone so far.

Blue, the FIM chip you reference, is that a new/replacement part or did you get an ECU flash? 

Where do you guys recommend going for the ECU flash, Feracci?

Thanks.

[brad black]

only bike i have before and after for is my 750:

the last two graphs in this one compare 900ss, one with hi comps, one without.  both have 41mm fcr, blue with pods, red airbox and open lid.  i did the cam timing on the red one recently, and one was quite advanced over spce as was so it might have an exaggerated midrange comparatively: http://www.bikeboy.org/900sswithfcrandhighcomp.html

in this report i believe the blue line (without hi comp) in the first graph may be a little high now comparatively, the red line is a different bike: http://www.bikeboy.org/900ssiehicomppistons.html

i did a 900ssie recently (tuned elsewhere with a pc3 on a dyno i've never used so don't know how it compares) that had je pistons, ported heads with 44mm inlet valve and v2 212 cams.  made 95hp i believe, but went flat at the top like my st2 did.  the owner pulled the cams back from 110 to 115 degree inlet centreline and says it feels much better at the top end.

st2 report here: http://www.bikeboy.org/st2hicomp.html  i didn't play with the cam timing on mine at all, just set it to 112.  no idea why now, probably time and money constraints.  it was the first bike i'd bought on "serious relationship" status.

i believe the v2 212 cams are worth a few hp.  the last few sets i have seen have had more duration and less lift than the vee two specs suggest.

[Blue]

Blue, the FIM chip you reference, is that a new/replacement part or did you get an ECU flash? 

Where do you guys recommend going for the ECU flash, Feracci?

The FIM is from days long gone.  I would say that any reputable shop that can reflash an ECU should work or a Power Commander would get the job done.  I would say it makes a difference if you have a shop dyno tune and reflash (or PC) vs a canned map on a chip.  Both should provide more than the stock set up, however. 

I am curious to know which way you'll head.

[OzzyRob]

I've written a ECU reader for a 2000 M900, works.

Working on the software to rewrite the ECU, should be ready soon. Should cost about Free.


PM me for more details if you're interested.

[M900GP]

PM sent - thanks!

Per the earlier posts with Dyno test results, I see the JE and other aftermarket pistons have 11.5:1 compression and claim to run on pump gas.  Can that be true?  I see in the dyno tests here that the pistons were milled a bit to yield 10.8:1, which would seem much more streetable.  Thanks for any feedback on that.

Also, I see one aftermarket piston provider offering a 96mm piston, upping displacement to 990cc.  I hear about increases to 944cc with the 94mm pistons, but wasn't sure about the claim to get up to 990 with another 2mm increase.  Apparently there's enough cylinder wall to go out that far?  Anybody gone that big, and if so what does that mean for valve train mods?

I picked up a Nichols flywheel and an aluminum clutch basket, so reducing some weight.  I'll combine that with the airbox.

I'm in the Seattle / Northwest area, so interested to know which shops you guys recommend for the head porting work, or to bore out cylinders for larger pistons?

Thanks.

[brad black]

machining 3mm off the crown dropped the je to 10.8.  in that guise i didn't have any ie motors ping on our 95/96 octane (different rating system to usa) fuel with the original ignition mapping, but an ss i supplied bits for, but without machined crowns, did ping a little in conjunction with advanced cam timing i was told.

carbs bikes will ping even at 10.8 without retarding the timing as a general rule.

96mm gives 984cc, you need specific cyinders and to machine the cases or they will break the spigots off if you use original cylinders.  i've never seen 96mm cylinders to suit post 97 motors.

[OzzyRob]

An interesting article on air filters.

http://www.avantiraceparts.co.uk/page.php?id=18


I've also found it a bit funny how lots of people go for more & more power on the street. I've ridden with a motley bunch of guys and girls and some of the fastest have been on bikes with  a change of pipe and jetting to suit. Hands up all those who've had the misfortune to be stuck behind a turbo bike with a slower rider. 

Not to say I'm not adverse to a little less weight and a little extra oomph. For us portly fellas the best performance is a losing the spare tyre  .

I'll be watching this thread to pick up any tips. 

[brad black]

would love to see the software.

[OzzyRob]

would love to see the software.

Pm me and I can fill you in on the details.