 Question about the rev. limit
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Joined: Jan 2005
Posts: 592
Adjunct
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OP
Adjunct
Joined: Jan 2005
Posts: 592 |
I have over 37000 miles on my bike and have never hit the rev limit so I don't know what to expect. I have the stock air box and stock jets. Removed the end baffle a long time ago. I very rarly go over 6000rpms. I once run up through the gears and the tac. read about 74000 and never hit the rev limit. Now, the other day I wanted a little more sound out of my bike so I drilled two 1/2" holes in the next baffel. I hit the road and opened it up to see if it had any effect on the power. I ran it up to about 7000rpms and it started to cut out. Like it was running one one cyl. Is this the rev. limit and my tac. is now off a little or am I running out of gas on the top end? Any thoughts or ideas? 
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Re: Question about the rev. limit
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Joined: Aug 2007
Posts: 10,736 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,736 Likes: 7 |
It does almost sound like it's a fuel issue. What you describe sounds similar to what happened to me when my hidden fuel filter was clogged, on the highway it would cut out one one side or another as it was short on fuel. That all being said, my limiter has kicked in at different rpms on different dyno runs, and they have been several hundred rpms apart. When my limiter kicks in on the street, rarely does it just bounce, it usually shuts the motor down for a few seconds.
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Question about the rev. limit
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Joined: Jan 2005
Posts: 6,821
Bar Shake
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Bar Shake
Joined: Jan 2005
Posts: 6,821 |
Igniter. Don't want to bum you, but it's a common problem and one cylinder cutting out is a classic symptom. 74000 rpm  (I know it's just a typo  )
Contra todo mal, mezcal; contra todo bien, también
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Re: Question about the rev. limit
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
Alan,
What is the year and model of your bike? Early Americas would hit the rev limit at around 7100 rpms while the Speedmasters would reach 7500. It sounds like you are hitting the limiter though like roadworthy stated. I've had the same happen to me at times where the rev limit appears to change a bit.
Since the only thing you have done is drill a couple of holes in your baffle, I don't think it is fuel related but make sure and check your fuel filter. Don't forget, as you reduce restriction in your exhaust, more air will flow and a larger jet size will eventually be needed. Are your snorkels still installed? If they have been removed, I would rejet.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Question about the rev. limit
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Joined: Jan 2005
Posts: 592
Adjunct
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OP
Adjunct
Joined: Jan 2005
Posts: 592 |
Thanks for the input. I have a 2004 America. 74000 is no typo, I just had it wound up REAL TIGHT 
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Re: Question about the rev. limit
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Joined: Jan 2005
Posts: 4,932 Likes: 2
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 4,932 Likes: 2 |
most engines will start to cut out @ 74,000 rpm. 
we should do this every weekend!
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Re: Question about the rev. limit
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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 |
Quote:
most engines will start to cut out @ 74,000 rpm.
I dunno, My tach goes to 11.
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: Question about the rev. limit
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Joined: Jan 2005
Posts: 8,639 Likes: 3
Old Hand
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Old Hand
Joined: Jan 2005
Posts: 8,639 Likes: 3 |
I find that my tach is no more accurate than the speedometer. Allowing for speedo error, the rev limiter is at 7400 RPM worth of road speed, but the tach only says 6800.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: Question about the rev. limit
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
Amazing what a difference an extra 0 can make.
Live to love, love to live.
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Re: Question about the rev. limit
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Joined: Jul 2007
Posts: 410
Adjunct
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Adjunct
Joined: Jul 2007
Posts: 410 |
My 2005 Speedmaster limits out at 7500 dead on the red line... I know it works coz I have hit the limiter in EVERY gear including TOP!!
TrOjAn
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Re: Question about the rev. limit
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Joined: Jan 2005
Posts: 3,753
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 3,753 |
3rd gear to a tick over 80mph, 4th till 105mph, and 5th till it goes past 120 
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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