Ducati Monster Forum

hey folks,

recently i got some carbon fiber MIVV slip-on cans from PJ's Parts, for my 750 Monster Dark '02. they look sweet. but since installing them the bike idles rough and coughs a lot, stalls. my wrench friend said now i need a jet kit to adjust the air/fuel intake for the new carbs. PJ said they dont sell these and to check what other people are using or go to a mechanic.

any recs on this? is this required/advised?

i also thought it could be related to removal of the emissions canister -- i didnt find the article here about proper removal until after we completed the job, so it's possible the hoses/plugs arent set correctly. i found these how-to on it:

http://www.ducatimonsterforum.org/index.php?topic=2514.0 (http://www.ducatimonsterforum.org/index.php?topic=2514.0)
http://ducatimonsterforum.org/index.php?topic=2337.0 (http://ducatimonsterforum.org/index.php?topic=2337.0)

2002 should be an IE model - fuel injected. So no jet kit for you.

Did you change the air filter and/or air box lid along with the slip ons? IF so, yes you'll need to add more fuel. If not, no. Slip ons alone will not alter the air/fuel mix.

I'm assuming you did the emissions and cans at the same time - right? If so - I'd swap back to the stock cans and see how it performs. By going back, you've eliminated one possible issue. With two potential sources getting rid of one tells you where the source is pretty quickly.

ah year you're right, i believe 2002 was the first year of fuel injected. well, that settles that.

did not change the filter.

i hear what you're saying, but it was a lot of work putting these things on, don't think ill be swapping them off. and having them on means removing the canister because they won't both physically fit (dunno if all cans are like that or just these MIVVs, but they left me no choice based on the layout).

guess my next steps are to ensure i did the hose plugging properly. if not then it's shop time.


thanks,
matt

Slip-ons are really not that hard, c'mon now. At least not in comparison to the 11 pieces of tube and 20 springs of my exhaust.

I guess it comes down to how much cash you want to drop. If you swap the stock pipes back on and you still have the issue - you know with near 100% certainty that the problem is rooted in the emission canister removal. If you don't, it might be spending a good bit more time on the mech bench - which is $s to you.

Being a touch cheap and a DIY type I'd have those mivvs off and back to stock in a jiffy.

And yes, on a DSS Monster, the emission cansters needs to be (re)moved with pretty much any highmounts.

eh, i just dont see the value in it. im stuck w/ these hi-mount slip ons, and the canister HAS to come off, as you say. so to me the next logical step would be to ensure the canister's plugs and hoses are dealt w/ per the install guides.

main thing i was interested in was the potential Jet Valve kit, but that has been resolved. so if i cant do a jet kit, and the canister procedure is verified as correct, then the DIY options are at an end... for me. ymmv

I really doubt slipons would cause that big of an issue.  most are made to just simply slip on [bacon]

my wrench pals all said that as part of the exhaust changing the cans can affect how it all works together, thus the jet kits are common for carbed models. change's a valve diameter a bit, they say.

If you need to you can get a power commander and try one of their maps for your bike. i have the same bike with Arrow slip ons open airbox and a PC3 it runs great.

I still think you're on a goose chase. You did two things and now have a problem. Proper problem solving says you eliminate one change and see if the problem persists. Introducing a power commander is yet another change and if not correctly mapped will play all sorts of hell with your bike.

If it was me I'd have those slip ons off and back to stock. It's maybe 30 min of work to do. A power commander will run you at least $200 for the module and run 1-2 hours to install... And then there's still the map issue

yes it will effect the flow of things, possibly run like shit or have dead spots in the rpm range, however its not going to make it sputter to death.  the fact that your mechanic friends said to install a jet kit on a bike that is obvously fuel injected makes me lean you towards asking different folk, not to diss your friends because everyone has friends that think they know what they are talking about and don't.  much like the internet. [bacon]

my mechanic friend was referring to the situation in general (adding slip ons, altering idle), and was not looking at my bike. my friend designed the Wraith bike, so i trust that he knows what hes talking about. i was just doing the legwork and inquiring about the kit.

as for eliminating issues, i dont really care to undo the slipons -- as i said, im stuck w/ them. they are here for good...next step is figuring out whether its the canister-removal hoses, and after that the shop.

thanks all for the suggestions.