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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through August 09, 2005 » Stumble at 3k... « Previous Next »

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Coyote_xb12s
Posted on Thursday, August 04, 2005 - 08:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
My bike seems to have a stutter or stumbles around 3k RPM in any gear, any ideas as to why this might be.
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Buellin_ri
Posted on Thursday, August 04, 2005 - 08:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
hot or cold?
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Brewtus
Posted on Thursday, August 04, 2005 - 08:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Any mods?
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Coyote_xb12s
Posted on Thursday, August 04, 2005 - 11:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
It does it at all operating temps actually.
No mods.
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Karstenfarley
Posted on Friday, August 05, 2005 - 12:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Coyote, I have the same issue. When I first got the bike (used) I tried explaining it to someone almost like "missing". If I hang out right around 3k for more than a few seconds its like its not getting fuel or spark for a number of cycles. It keeps doing it till I move faster and doesn't do it when I motor right past the 3k point . Makes for a rough ride around town when the girl comes along.
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Odie
Posted on Friday, August 05, 2005 - 02:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Sounds like the ECM going from closed loop to open loop.......
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Glitch
Posted on Friday, August 05, 2005 - 08:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Sounds like the ECM going from closed loop to open loop.......
That's my guess also. If yo want as few mods as possible, take the snorkel out and try that. If that doesn't do it for you drill, or cut your air box. This won't get rid of it, but will make it less noticeable.
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Karstenfarley
Posted on Friday, August 05, 2005 - 12:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
The snorkle is already out so maybe I'll look into cutting air box.
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Kenny_v
Posted on Friday, August 05, 2005 - 12:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Just chime'n in here ,
I have the same issue as well . Glitch when you say cut the air box , where should you make the opening ?? I think I'm going to try it..

Ken
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Tobandeira
Posted on Friday, August 05, 2005 - 01:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Nope
You should verify if the ECM is the race one..... if it is some of them have that small glitch.....i only sort that out getting back to the OEM ECM, unfotunately
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Fullpower
Posted on Saturday, August 06, 2005 - 03:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
yes all three of my ECM s run real crappy around 3000 rpm. too bad because that is right at 62 miles per hour in top, and 50 mph in 4th. very hard to maintain a legal speed limit with my bike. real smooth around 2400- 2700, and of course just great over 3400 rpm. Bike loves to run over 4000, will do it all day long, just not legal around here.
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Truk
Posted on Saturday, August 06, 2005 - 08:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Don't the XB12s have a flapper type valve in the exhaust system similar to Yamaha EXUP valves.

Could it be that this is hanging up? My R1 has one and if it isn't functioning properly can give some running problems.
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