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Old 09-26-2005, 02:03 PM   #1 (permalink)
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Default Engine noise on new M50

I have ridden my new M50 120 miles so far. It has an annoying noise coming from the engine if I let off the throttle quickly while riding. Say I am going 55, and I let the throttle quickly, I get a "chirping" sound from the engine (or so it seems like the engine). It is not an ongoing noise, just a quick chirp, or squeak. If I let off the throttle slowly, the noise is not there. Anyone ever had this experience. Thanks.

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Old 09-26-2005, 03:55 PM   #2 (permalink)
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Yep! Sounds kinda Alien. Nice bike !
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Old 09-26-2005, 04:07 PM   #3 (permalink)
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Get louder pipes.
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Old 09-26-2005, 04:13 PM   #4 (permalink)
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To better describe the sound, it sort of sounds like a back tire squawking as you downsift into too low a gear and let the cluch out. You know that little chirp sound a tire can make? That is what I thought it was at first. Do they make pipes for this bike? Since it is the first year for this bike to have fuel injection, I was wondering if pipes from the older version would be the same. Enlighten me please. ALl of the lipes I have seen so far only go up through 04.
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Old 09-26-2005, 06:16 PM   #5 (permalink)
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Is it belt-driven? Could your belt be loose? I admit I have no knowlege of motorcycle belt drives.
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Old 09-26-2005, 06:19 PM   #6 (permalink)
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The M50 is a shaft-driven bike, not belt. I was inclined to ask if the noise may be shaft jacking until I read that the noise seemed to originate from the engine.

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Old 09-26-2005, 06:28 PM   #7 (permalink)
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I hear it in mine too; I think it's the gears in the tranny "backlashing" or something. I don't let it bother me.
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Old 09-26-2005, 06:35 PM   #8 (permalink)
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But he does go on to share "or so it seems like the engine" in his first post though.

The reason why I mention that is because I noticed that little chirping sound myself when I'd let off the throttle shortly after I first purchased and was also told it was shaft jacking.

Brackneyc, Have ya rode some more since ya posted and been able to nail down that it's coming from the engine or not?
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Old 09-26-2005, 06:37 PM   #9 (permalink)
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I guess I really never thought of the noise too much because I haven't really heard it. Your engine may be trying to match revs to the current gear and that's why you may be experiencing the noise. The more you ride your bike, the better you get to know it. With enough practice and experience, you may be able to reduce, if not eliminate, that noise.
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Old 09-26-2005, 06:39 PM   #10 (permalink)
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Brackneyc-
I just got Vance & Hines Cruzers for my M50. You have to get the ones made for the C50, but they fit absolutely perfect (practically the same bike). I put them on my bike, but it ran really rough with a lot of backfiring on decel. So i had to get the powercommander, which I am waiting for right now. It will smooth things out. Check out http://www.pipecity.com
They had the best price going. Got the Cruzers for $329 shipped. Add the powercommander (they will send it already mapped for the M50 and the pipes) for $265 shipped. Everyone else has the PC for $320-$330.

Hope this helps.

btw- the sound from the pipes is awesome.
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Old 09-26-2005, 07:13 PM   #11 (permalink)
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The chirp is the sound of the gears in the rear diff slowing down (aka "shaft jacking")
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Old 09-26-2005, 09:17 PM   #12 (permalink)
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i noticed it with mine fairly early on... seemed to subside some after the first service, but then came back. I only hear it if I let off the throttle quickly...

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Old 09-26-2005, 10:58 PM   #13 (permalink)
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Alright folks, it seems like it may be "shaft jacking" based on several people saying they have the same issue. I have put a few more miles on it, and I love the thing so much that I don't even notice the noise unless I listen for it. This is such a cool bike. I have owned about 25 bikes over the years, and I feel so relaxed on this one that it is hard to describe. I would have probably gotten the C50, but I haven't had the long rear fender grow on me yet. It was a hard choice, but I think I did get the one I liked best.
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Old 09-27-2005, 12:04 AM   #14 (permalink)
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That's good, yep I think mines gonna be a keeper also.
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Old 09-27-2005, 12:42 AM   #15 (permalink)
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Quote:
Originally Posted by Mavman
That's good, yep I think mines gonna be a keeper also.
Hey Mavman, I live over in the Quad Cities. Next summer, my gang (I have affectionately named us the Peanuts Gang) and I are planning a nice ride to Des Moines. Maybe you and yours can plan a trip to Des Moines and we can do lunch. I'll be the guy on the other Red M50.
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Old 09-27-2005, 08:31 AM   #16 (permalink)
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Quote:
This is a simple result of the fact that the swingarm and rear drive are one unit, hinged at one end: vertical movement will cause rotation, and rotation will cause vertical movement. Think harder about the latter part of that relationship: the torque of the wheel and drive will move the suspension vertically. This torque-induced suspension movement, sometimes called "the shaft effect" or "shaft jacking" is considered to be a drawback to traditional shaft-drive designs.
http://www.largiader.com/paralever/

Call me silly....I fail to see how this relates to your noise problems.

The only time I've experienced this noise has been if I got retarded and downshifted a little early.

Shaft jacking is a concern of serious riders when they are in a corner rolling on the throttle and the upward movement caused by the shaft upsets the bike's "set" in the corner.

When you downshift. Does the engine rev high, and you kinda move forward on the seat?
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Old 09-27-2005, 08:40 AM   #17 (permalink)
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Are you winding the bike way out in each gear and then just dumping the throttle???
Another point to remember is that any noise on a mechanical machine can be carried to different parts of the machine. I.E.-- Harmonic noises may originate from one point but travel down to another to where it is easier to hear thus you end up chasing a noise that is coming from somewhere else. If it truly is the shaft drive then the shaft tube is a perfect noise conductor for a noise to travel across.

Could it be that maybe it is the clutches trying to maintain grip if they are winding the bike way high up in the rpm scale and then just dropping the throttle off. If so I am inclined to side with Tim if you are hearing and over rev of the bike.
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Old 09-27-2005, 09:07 AM   #18 (permalink)
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Quote:
Originally Posted by stp1971
I.E.-- Harmonic noises may originate from one point but travel down to another to where it is easier to hear thus you end up chasing a noise that is coming from somewhere else. If it truly is the shaft drive then the shaft tube is a perfect noise conductor for a noise to travel across.

I'm leavin' this one alone!!!!!!!!!!!!!!!

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Old 09-27-2005, 10:01 AM   #19 (permalink)
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Quote:
Originally Posted by Brackneyc
Hey Mavman, I live over in the Quad Cities. Next summer, my gang (I have affectionately named us the Peanuts Gang) and I are planning a nice ride to Des Moines. Maybe you and yours can plan a trip to Des Moines and we can do lunch. I'll be the guy on the other Red M50.
Sounds excellant ...I'll send ya a pm.
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Last edited by Mavman; 09-29-2005 at 06:59 PM.
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Old 09-27-2005, 11:50 AM   #20 (permalink)
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Quote:
Originally Posted by stp1971
Are you winding the bike way out in each gear and then just dumping the throttle???
Another point to remember is that any noise on a mechanical machine can be carried to different parts of the machine. I.E.-- Harmonic noises may originate from one point but travel down to another to where it is easier to hear thus you end up chasing a noise that is coming from somewhere else. If it truly is the shaft drive then the shaft tube is a perfect noise conductor for a noise to travel across.

Could it be that maybe it is the clutches trying to maintain grip if they are winding the bike way high up in the rpm scale and then just dropping the throttle off. If so I am inclined to side with Tim if you are hearing and over rev of the bike.
I am driving the bike like a little old lady. During break in especially I would not rev it high, but don't normally rev my bikes high anyway. The noise comes when I let off the throttle while cruising at speed. I ride with several other people, and at times, the lead guy may slow down suddenly, and I will let off the throttle and prepare to either stop, or slow way down. Maybe I have developed some kind of wierd riding style, but I have been doing it for 35 years, and I'm not likely to change it. No other bike I have had has ever done this, but this bike is much different that any other bike I have ever had: shaft drive, fuel injection most noticeably.

I'm not sure what the noise is, and for now I am not going to let it bother me. I will mention it when I take it in for the 600 mile check and see if they know what it is.
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