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 fluctuating RPM's
#4190
02/16/2005 11:49 AM
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Joined: Feb 2005
Posts: 78
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Posts: 78 |
A few days ago I was trying to figure out a problem w/ my right cylinder cutting out @ 3800-4200 rpm's. I had only observed this while riding, so I decided to listen while I had the bike up on the jack. Ironically enough I never heard it miss a beat, but I did notice the rpm's surging up & down @ around 4000 revs. Is this normal? Any ideas why? My first thought was maybe a vacuum leak...but everything seems tight.
woe is me...
miles & miles of Texas...
TM
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 6,308 Likes: 4
Worn Saddle
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Worn Saddle
Joined: Jan 2005
Posts: 6,308 Likes: 4 |
mouse,
Check the vacuum caps very closely for minute cracks. I had the exact same issue and it turned out to be itty bitty cracks in the caps. Replaced them and the problem went away.
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 530
Adjunct
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Adjunct
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Posts: 530 |
Mouse,
Did you feel the bike lose rpms or did you see it on the tach?
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Re: fluctuating RPM's
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Joined: Feb 2005
Posts: 78
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OP
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Joined: Feb 2005
Posts: 78 |
I was actually watching the tach...looked like about a 100rpm swing w/ the throttle steady. I did replace the rubber caps a few months ago...you're right, they had split quite a bit. The new ones seem OK. Maybe I bought some demon gas somewhere...perhaps I should try some of Dinqua's home brew for an additive. At least if it didn't work I could drown my sorrows.
...my kingdom for fuel injection, TM
miles & miles of Texas...
TM
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 432
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I've replaced my caps twice now. Is there a better vinal or rubber out there? I know they are cheap at Auto Zone, but why do they crack like that! I can tell just by the lack of power when one goes bad. Maybe the size is too small, or I need a metric size.
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 1,018
Learned Hand
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Learned Hand
Joined: Jan 2005
Posts: 1,018 |
You can run a lenght of vacuum hose between the carbs and do away with them all together
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 299
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Adjunct
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Quote:
Is there a better vinal or rubber out there?
Got mine from TeamTriumph. They are a lot more substantial than the caps I got with an AI kit sourced elsewhere.
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 432
Adjunct
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Adjunct
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I just went back to Auto Zone and bought 1/4 inch caps. The rubber looks to be thicker than the 3/16 inch caps. They seem to fit ok, and I've not noticed any intake leak. Maybe these will last longer...
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Re: fluctuating RPM's
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Joined: Jan 2005
Posts: 82
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Member
Joined: Jan 2005
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I had a problem with my BA. It was cutting out around 4000 rpm and on up. I could hear a sucking sound coming from the airbox. Further examination revealed the whole side of the airbox to be blown out. Dealer said this probably happened from a backfire. Anyway, it was still under warranty and replaced at no cost to me. Just a thought because I had never heard of that happening.
Brian
Nuttier than squirel s**t.
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