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Message started by diesel on 09/18/05 at 21:44:25

Title: engine chirp
Post by diesel on 09/18/05 at 21:44:25

i have a question for the group. this chirp is audable ONLY on decel with closed throttle. comes from right of engine.crack throttle open VERY slightly,chirp stops,from there to wot, no chirp.apperently i have this chirp at only max. vacumn. if we have any old truck drivers here,the chirp follows EXACTLY the sound pattern of a jake brake. as you can see by my user name, i am quite familer with "jakes",use to teach 'em in my engine classes. does anyone else have this decel chirp? i have tightened carb to head clamps.(not loose at all) has any of you solved this chirp and if so, HOW?bill aka diesel. '03 ls 650 with 3k on it.

Title: Re: engine chirp
Post by diesel on 09/19/05 at 22:29:30

can't anybody even come with an educated guess? diesel.

Title: Re: engine chirp
Post by Greg_650 on 09/23/05 at 15:47:46

This is probably uneducated....

Is your crankcase breather hose connected?

Do you have a stock airbox?

:P

Title: Re: engine chirp
Post by diesel on 09/23/05 at 21:04:07

yes and yes,darn good questions, though.'cause only audible when throttle is completly closed. bought '03 used, mixture screw out 2 1/4 turns. never had slide out yet to check white spacer or bowl off to check jetting. exhaust stock, but header pipe is a VERY light gold after 3300mi. no blue no place.runs real good to 80 mph with throttle left for more, that suites me all to he!!, back fires are very few and far between and when it does backfire,it's very light, more like a futt than a bang and only from closed throttle from high rpm. i'm from the old school, if it ain't broke, don't fix it. all this and averages 55 to 60 mpg pushing a plexistar 2 shield. all this kinda indicates fuel raito through the rpm range is pertty darn close. if and when it starts to act up or milage drops off, i'll break 'er open and have a peek. till then, i just gonna ride 'er, let 'er chirp and be da$$ed.Bill aka diesel.

Title: Re: engine chirp
Post by Greg_650 on 09/24/05 at 07:46:41

The reason that I asked is that you CAN hear a "chirp" sound if the airbox is changed or you have a K&N pod filter. The sound comes from the intake valves when you slightly OPEN the throttle (not closed).

Also, the crankcase breather makes a particular noise too if it is disconnected, and the breather is on the right side.

Does the sound follow engine rpms or road speed?

Title: Re: engine chirp
Post by diesel on 09/24/05 at 21:06:59

follows engine rpm, decelerating,pull clutch, chirp gone, reengage clutch,bike still pushing engine, chirp,chirp comes up with rpm. crack throttle, gone. now it ain't real loud, actually, kinda faint, but iffen you listen, you can hear it, don't think it too serious. some day when poor running indicates, i'll pull carb,in that area somewhere. mabye i just otta wear a full face helmet, i know i would never hear it then. diesel.

Title: Re: engine chirp
Post by Greg_650 on 09/25/05 at 06:51:38

You aren't giving up are you? Not a diesel mechanic...:P

How do you know that it's in the area of the carb? What in the area of the carb would make a chirp?

Title: Re: engine chirp
Post by diesel on 09/25/05 at 21:49:35

Greg: thats just it, diesel tech NEVER has to tinker with no stinking carburetors. it's a learn as you go process for him. high pressure fuel injrction and no throttle of air, a whole different set of rules for running an engine. fuel/air ratios will run 500 to 1 or more at idle to 30 or 40 to 1 at maximum engine load. only control amount of fuel engine receives, no control of air it receives, turbochargers just blow in more air so more fuel can be injected= more torque from same displacement engine. so as long as my little beast runs as good as it does, my learning curve on thoes stinking carburetors will just have to wait a little while longer. diesel

Title: Re: engine chirp
Post by Greg_650 on 09/26/05 at 06:29:37

Ah but mechanical troubleshooting is the same technique no matter what type engine. The fuel delivery is different on a diesel, but the basic needs of an engine are the same....they all need fuel, oxygen, and ignition. Whether the fuel is delivered under pressure or by venturi....it is the same. Add a blower for more air, add more fuel.....

But then again, I don't know why we are talking about carbs anyway. Why do you think the carb is chirping?

Title: Re: engine chirp
Post by diesel on 09/26/05 at 22:13:27

how right you are, maybe not carb, maybe something else. iffen it gets worse, I'll find it.

Title: Re: engine chirp
Post by clueless on 09/27/05 at 04:08:08

Diesel,
I had a decel chirp for a long time. Sounded to me like it was coming from the left side. I never found out the cause, but it disappeared when I removed the belt guard! Was exactly as you describe, only on decel, disappeared with a little throttle.
Good luck,
Jim

Title: Re: engine chirp
Post by mpescatori on 09/27/05 at 10:47:24

Diesel, I'm not a technician, but my other bike is a...
.
.
.
(hold on, it's coming)
.
.
.
1980 MGB english car, right hand drive and all that, and it chirps, rattles, sighs, moans and more! all the way from startup to shutdown.

Check and see if all the engine-frame bolts are nice and tight, it could be something is jiving because it's just a leeetle loose.
Or, see the clutch bearings, or the final drive front sprocket. You say it only happens when at high revs and closed throttle. Well, to me this spells high revs, torque applied from road to engine and not as it should be, so with force being applied the other way 'round, I wouldn't be surprised.

Let us know, it could be important

Maurizio

Title: Re: engine chirp
Post by diesel on 09/27/05 at 11:26:42

clueless and mpescatori: many thanks for pointing in another direction. I can only hear out of my right ear, too many rifles craking and unmuffeled engines running on govenor in the years before ear protection, probably why I think I hear it from right side. clueless,thats the noise exactly, come to think of it, ths belt would change tension top and bottom on and off throttle. going out right now and ckeck that guard.diesel

Title: Re: engine chirp
Post by clueless on 09/27/05 at 17:18:23

Diesel,
No adjustment cured it, only removal. Kinda blew my mind, but like I said, it cured it!
I listen to my baby when she talks!!

Good Luck

Jim

Title: Re: engine chirp
Post by diesel on 09/27/05 at 21:08:15

clueless: thank you, thank you, thank you! removed guard, took ride, decell chirp gone.info available on this board, PRICELESS! I thank everyone for all the sugestions.diesel.

Title: Re: engine chirp
Post by clueless on 09/28/05 at 05:45:12

Glad you found it!! I'm a decent trouble-shooter, but it is frustrating to find something that only happens when you are moving! I did medical imaging repair for years, but that stuff stayed put. Now I sit on my *ss and do tech support.

have fun

Jim

Title: Re: engine chirp
Post by Savage_Rob on 09/28/05 at 06:16:47

Okay, this is slightly tangential to this thread but I'll ask anyway. What are the possible the downsides to removing the belt guard? Passengers getting pant cuffs caught and being dragged into the sprocket? Water and crud getting slung at the rider? These are just guesses as to why the bike has the guard in the first place. I ask because I don't really like the look of the guard at its present angle after I put on my new Progressive shocks and am considering simply removing it. I know a number of folks have removed theirs. Have any of you noticed any downsides or potential problems?

Title: Re: engine chirp
Post by torque on 09/28/05 at 07:01:08

no downsides at all,unless u wear a kilt or dress ::)

Title: Re: engine chirp
Post by clueless on 09/28/05 at 07:06:36

Just something that gets in my way when working on it. Similar to the chrome engine covers. Gone. I like the look better with the belt guard gone, noticed no downside....yet ;D

Title: Re: engine chirp
Post by vroom1776 on 09/28/05 at 12:33:25

I park mine in the back yard and I have to pull weeds out of the belt now and again... could always get a rock in there... you expose these two little tabs that the belt guard was attached to... must shim the lower left shock linkage

Title: Re: engine chirp
Post by Greg_650 on 10/02/05 at 08:17:03

Savage_Rob wrote:

Okay....first off, as a genuine mechanical technician, I dislike the idea of removing something to get rid of a noise....to me that's like removing the engine to get rid of the backfire. AND in this case, if removing the belt guard eliminated the chirp, then the problem was either in the mounting of the guard or the front pulley cover. Either one shouldn't "chirp" if correctly installed.

As for the possible issues relating to an exposed belt that travels on open spinning pulleys....I don't see a problem as long as the rider keeps his feet on the pegs. I still have the front pulley cover installed and I threw away my "elephant" bell bottoms a few decades ago. Not a problem, Rob 8)

Oh yeah, don't forget that I fashioned a rear fender mud flap (barely visible) that keeps dirt from bouncing off the swingarm and getting into the belt.

Title: Re: engine chirp
Post by Savage_Rob on 10/02/05 at 14:33:36

Greg_650 wrote:

Okay, I'm good with that. No noise with mine either; I just don't like the lines formed by the front pulley cover and upper belt guard now that I have higher shocks installed. They form an angle instead of a straighter/cleaner line. I also still have the other mud flap from the pair I got at JCW that you'd pointed me toward last year, I'd bet it'll work well modified slightly and attached to the front of the rear fender. I was considering that today as I put my saddlebag supports back on. Thanks Greg.

Title: Re: engine chirp
Post by clueless on 10/02/05 at 17:42:37

Just a note. I did not remove the belt guard as a troubleshooting attempt. I just like the look better with it gone. Took me awhile to realize the chirp was gone and put 2 and 2 together. The chirp never really alarmed me. Was always there, but I bought the bike used. You never know what the previous owner did, correctly or incorrectly. I bought the Savage so I could do what I felt like without serious depreciation. ;D

Jim

Title: Re: engine chirp
Post by Greg_650 on 10/09/05 at 08:15:14

clueless wrote:

That's all very true, and it is your bike to change as you wish. It's what we do after all :)

I was just thinking of it as an educational thing....someday this question will be posted on this forum again. Guarrrranteeeed.