So I've got an '01 M900ie with about 15K miles on it. As the new owner, I'm going through the usual easy mods. One of the first was to remove the emissions canister.
First weird thing - the hose that comes from the canister and is supposed to go to the throttle body ports is chopped and plugged but still goes to the canister and is neatly tie-wrapped along the right frame tubing. So I go about removing the canister anyway and everything is cool. While I'm at it I remove the crankcase vent canister and hosing, plug the port in the airbox and do the mini pod K&N filter right at the vent. Since I have no hose to follow to the throttle bodies, I'm stuck on the rest of the directions - I don't know where to look for the throttle body emissions ports. I throw up my hands and think "well, I haven't messed around with anything important" so I start it up and it runs great (as expected).
Now the next weird part. With some additional poking around and help from TPO Parts, I identify the emissions ports and it turns out that there is a hunk of hose connecting the two throttle body ports together. Why would someone go to the trouble of cutting the emissions canister hose and then capping the two TB emissions ports by connecting them with a hunk of hose, but not remove the canister? So I remove the hose, the two ports and install the plugs (screws). Guess what? The bike runs like crap. Hardly starts and barely idles. So I put the ports back in (which just have the tiniest little pinholes in them) and put the hose back and she runs great again.
Is this some kind of known fix for the '01 injected bikes? Anyone every heard of this? I don't really care that much that I have to leave the ports and hose in there - it's not that big a deal compared to the canister, etc. - I just don't get it. It makes me think that something really should be fixed and this is a band-aid. Could this hose be equalizing the two TBs? Maybe they need to be "synced" if that's the right term for a injected motor?
did you seal the bolts. i've heard if they are not sealed you get a vacuum leak and it would run like [puke]
reason i say i heard is that i've just done this myself and haven't ridden it yet. i sealed the ports with end tubes not bolts.
Quote from: Raux on September 18, 2008, 08:42:50 PM
did you seal the bolts. i've heard if they are not sealed you get a vacuum leak and it would run like [puke]
reason i say i heard is that i've just done this myself and haven't ridden it yet. i sealed the ports with end tubes not bolts.
I would suspect it needs to be synched but in order to synch it, you'd remove that hose to connect the TBs to the sticks. It's easy enought to mkae a manometer for a few dollars and try that out but I don't know if that's going to solve you're problem.
As mentioned, perhaps the bolts you used did not seal entirely. Maybe try buying some vacuum caps and putting them over the ports when you remove the hose. If that works then you just need to seal the bolts when you put them in. Some Loctite might work for that.
Scott
I had a similar issue on my M696. I sealed the ports with vacuum caps and its back to normal.
or some high-temp silicone on the bolt thds will help seal. or a little fiber crush washer.
+1 on suspecting vacuum leak.
it's also entirely possible that your TBs are out of synch anyway...
Quote from: sejman on September 18, 2008, 07:21:10 PM
With some additional poking around and help from TPO Parts, I identify the emissions ports and it turns out that there is a hunk of hose connecting the two throttle body ports together. Why would someone go to the trouble of cutting the emissions canister hose and then capping the two TB emissions ports by connecting them with a hunk of hose, but not remove the canister?
Some people use to do this before it was wilely accepted that you just need to plug the holes. The old hypothesis was that it helped balance the air pressure feeding the 2 throttle bodies. This has been deemed a myth as the European version do not have a "balancing" hose.
+1 on you not sealing the screws properly.
started the bike up today after rerouting all the tubes and replacing my blown fuses (tail chop wiring problem, dont ask)
i had sealed the nipples with end tubes instead of bolts.
started just fine no hiccups and idled fine.
definitely think you had a seal problem with your bolts
Hi guys,
Thanks for all the feedback, but I did seal the screws using loctite. My guess now is that my TBs are way out of sync. I'm going to see if one cylinder or the other is worse when plugged and go from there. If I need a sync, what's the procedure? Is it a DIY project?
dealership did mine for free... but it's a newer bike...