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Old Yesterday, 11:02 PM   #1
Rharr OP
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Joined: Apr 2014
Location: Tucson Az
Oddometer: 22
990 Canisterectomy followup

So I am in the process of pull all this stuff off my 2010 990R and see a footnote at the end of the HOW article.

*After riding with mine as I'd done it above for about 500 miles I
was having issues with the bike surging between exactly 3000-4000 RPMs.
After much discussion and debate I pulled the bike back apart and instead
of putting the bolts into the intakes I simply took some hose and the little
pipe clamps leftover from the canisterectomy and connected the two sides
using the stock brass pieces. Dusty and I both had this problem and it
fixed it both times. Apparently you cannot use the same techniques as the
950 in this regard.

I was wonder how many of you newer 990 owners (09+) have had this issue and did the hose trick?

I know the early 990's had some injection issues but they seemed to be better sorted out in the later years right?

I can't get my head around why connecting the throttle bodies together with a bit of hose would fix the surging, those brass nipples have tiny orifices and seem like it would hardly have any effect on the other throttle body for the brief moment of vacuum between pulses.

I guess what I am asking is should i keep the nipples and connect them with some hose or just remove them and close up those extra holes?

I just see having that extra bit of hose as something that can crack/falloff and cause more issues, but am willing to take my chances if blocking the holes off effects the throttle smoothness.

I am running a 2:1 and a some sort of Tune ECU tune. (previous owner)
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Old Yesterday, 11:49 PM   #2
Dusty
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Joined: Jun 2007
Location: Bismarck
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Quote:
Originally Posted by Rharr View Post
So I am in the process of pull all this stuff off my 2010 990R and see a footnote at the end of the HOW article.

*After riding with mine as I'd done it above for about 500 miles I
was having issues with the bike surging between exactly 3000-4000 RPMs.
After much discussion and debate I pulled the bike back apart and instead
of putting the bolts into the intakes I simply took some hose and the little
pipe clamps leftover from the canisterectomy and connected the two sides
using the stock brass pieces. Dusty and I both had this problem and it
fixed it both times. Apparently you cannot use the same techniques as the
950 in this regard.

I was wonder how many of you newer 990 owners (09+) have had this issue and did the hose trick?
Not really a trick... This was debated with the 950s also and came down to personal preference. I trolled the OC for a year and a half before i bought my bike and this is what i felt comfotable with. The hoses are connected together from the factory and went to the canister to pull vapors.

I know the early 990's had some injection issues but they seemed to be better sorted out in the later years right?
Hmm... i still read of issue with fueling on the newer 990s and 1190s

I can't get my head around why connecting the throttle bodies together with a bit of hose would fix the surging, those brass nipples have tiny orifices and seem like it would hardly have any effect on the other throttle body for the brief moment of vacuum between pulses.

I guess what I am asking is should i keep the nipples and connect them with some hose or just remove them and close up those extra holes?
Do what you feel comfortable with.

I just see having that extra bit of hose as something that can crack/falloff and cause more issues, but am willing to take my chances if blocking the holes off effects the throttle smoothness.
Had mine like this for 7 years now, dont see that as an issue.

I am running a 2:1 and a some sort of Tune ECU tune. (previous owner)
Do you feel that you have fueling issues?
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Old Today, 08:53 AM   #3
rockitman4x4
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Joined: Oct 2013
Location: Ely, NV
Oddometer: 71
I ran the hose between the 2 ports and my bike runs great. I even put on 2 FMF 4.1 pipes on at the same time with no problems. Bikes got over 10,000 on it now still running great.
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Old Today, 09:01 AM   #4
Rharr OP
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Joined: Apr 2014
Location: Tucson Az
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Quote:
Originally Posted by Dusty View Post
Do you feel that you have fueling issues?
No fueling issues yet, just trying to be preemptive and understand the full setup since getting to the ports is a little tedious.

Thanks for your feed back.
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Old Today, 09:52 AM   #5
renogeorge
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Joined: Apr 2007
Location: Reno
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Very interesting! Now that you mention it, I do recall some later Triumph twins tying together the intakes in a similar fashion. My 990 is running pretty well. But I may try it.

FWIW
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