Knocking Sound Under High load - Honda Motorcycles - FireBlades.org
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post #1 of 20 Old 01-13-2017, 10:39 PM Thread Starter
 
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Knocking Sound Under High load

2000 honda shadow Ace 750 22,xxx miles aftermarket pipes LOUD bike has been doing fine,,, i tool it on a 2.5hr ride each way,,, i had my head phone in on the way there and on the way back i could hear a knocking sound, very little but could hear it Dosen't match the RPM but more like knock,,,,,knock,,,,,,knock so i started to play around a little ,,,,,,,i realized if I start out in "per say" 2nd or 3rd gear from take off you could REALLY hear it , but with the pipes and traffic i could hear it but not the best...,,,,,,,,,,,,,,,,,even in 5th gear running 55-65mph i could hear it knock,,,,,,,,,,,knock ,,,,,,,,,,,,knock,,,,it sounds like its coming from the lower left side ,,,,,,,,,,,,i dont know a TON about bike,, it the shittest part was i have the bike up for sale and now this happens,,,im not the kind of person to put a bandaid to make a quick $2000 .......so please advise on what i can do to narrow down or help somebody else diagnose... i do have a youtube account if i need to make a video....couple weeks ago i took a 2hr trip each way and i swore i could hear a knocking sound but didnt want to belive it ,,,now i know somehthing is true......thanks again friends ,,,,j bursby
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post #2 of 20 Old 01-14-2017, 2:42 AM
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Re: Knocking Sound Under High load

Hi, could you lift the bike off the ground with paddock stands rotate the wheels and check the chain rotation in the front sprocket area, if its a knock and not rpm associated , then it could be something catchingBill
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post #3 of 20 Old 01-14-2017, 7:38 AM
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Re: Knocking Sound Under High load

From your description Bursby, sounds like Bill may be on the right track. My guess... your drivechain and sprockets are beat. Check chain slack with your manual (or Google it), and assess the teeth on both sprockets. A loose chain, under a load, will make a knocking or banging sound, but usually the rider will notice a momentary hesitation of acceleration which accompanies this. Wearing headphones could somewhat "mask" a rider's sensisitivity to this.

If a loose drivechain is your culprit, you may get out of it by proper adjustment. If it's not a chain, perhaps having an experienced rider of a friend ride along side of you, listening for the noise, would also be a good option.

Good luck and keep us posted

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post #4 of 20 Old 01-14-2017, 6:25 PM Thread Starter
 
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Re: Knocking Sound Under High load

i looked at the chair earlier and it it pretty loose couple inches of travel I do not have a "paddok" stand i only have the kick stand
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post #5 of 20 Old 01-14-2017, 6:26 PM Thread Starter
 
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Re: Knocking Sound Under High load

****CHAIN not chair hahaha
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post #6 of 20 Old 01-14-2017, 6:45 PM Thread Starter
 
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Re: Knocking Sound Under High load

heres some pictures....yes that is a doulbe A battery... i seee that is way too much,,,, would that cause the knocking noise
Attached Thumbnails
IMG_2310.JPG‎   IMG_2306.JPG‎   IMG_2307.JPG‎   IMG_2308.JPG‎  


Last edited by cb7guy; 01-14-2017 at 6:47 PM. Reason: telliong size of battery
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post #7 of 20 Old 01-14-2017, 6:52 PM
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Re: Knocking Sound Under High load

any images of the sprocket(s)?

that chain does look rather overdue for some tightening, cleaning, and proper lubrication. no, WD40 is not a proper cleaning agent NOR lubricant

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post #8 of 20 Old 01-14-2017, 7:04 PM
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Re: Knocking Sound Under High load

Quote:
Originally Posted by cb7guy View Post
heres some pictures....yes that is a doulbe A battery... i seee that is way too much,,,, would that cause the knocking noise
Where you are measuring the chain (and the visible slack shown) would lead me to believe that your chain is EXCESSIVELY loose.

You should try to get the measurement at the mid point between sprockets.

And yes, a chain with excessive slack will knock on the swing arm/engine case like crazy.

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post #9 of 20 Old 01-14-2017, 7:11 PM Thread Starter
 
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Re: Knocking Sound Under High load

i will pop the covers off tomorrow it is dark outside,,, and am currently working on my other truck also,,,, after thearing the head off and replacing the lifters i find out that i have a rod knock,,, so i am at a loss of what to do either put more money in to fix and then sell or sell as is and lose $1000 to $1500 off my asking price,,,,, i have over 2700 in parts alone in the truck,,, new tranny ,,new head ,, and evry new part i could buy for the motor when i had it taken out the truck,,,just really up set rode the bike and heard a bad sound then get the truck all put back together and now have a verified rod knock,,, with the possibilty of the crank being no good either ...
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post #10 of 20 Old 01-14-2017, 7:15 PM Thread Starter
 
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Re: Knocking Sound Under High load

please let me know what you need me to do,, pics vids and i will be glad to do so... ive had the bike a year or 2 now,,,,the bike just had new tires put on about 6 mobths ago,, and the shop said the tightened the chain and what not,,,, i think that alot of slck for 6 months,,,, i will get good pics tomorrow of the front and rear sprocket,,and chain,,,,im adduming the fat guy before me nver had them changed,,,,

yes i know wd 40 is the best lube for chainn hahhahahhahahah just kidding,,, my other bike is a 97 cbr f3 and boy did i learn alot,, i own the haynes ,,,chilton,,,clymer books....i like to read
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post #11 of 20 Old 01-14-2017, 8:35 PM
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Re: Knocking Sound Under High load

my advice... dump it.
put a fair price on it ($1200-$1500) with full disclosure.

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post #12 of 20 Old 01-14-2017, 8:40 PM Thread Starter
 
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Re: Knocking Sound Under High load

Quote:
Originally Posted by u
nslow1;1699233889
my advice... dump it.
put a fair price on it ($1200-$1500) with full disclosure.

whats the disclosur ,,, "chain might be lose here take my bike for pennies " wtf kind of respone is that not looking for WHAT YPIU WOULD do ,, but rater what is wrong so i can fix,,, did you miss the part of motorcycle repair this isnt MOTORCYCLES FOR SALE
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post #13 of 20 Old 01-14-2017, 8:51 PM
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Re: Knocking Sound Under High load

so what's with the "so i am at a loss of what to do either put more money in to fix and then sell or sell as is and lose $1000 to $1500 off my asking price"

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post #14 of 20 Old 01-15-2017, 7:59 PM
 
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Re: Knocking Sound Under High load

Now you've done it Casey

cb7guy I would take the time to clean the **** out of that chain, inspect it along with the sprockets and lube everything up good . An overly loose chain will make a lot of noise and wear the sprockets quicker than normal. You can adjust the chain just as it states in the manuals that you have for those other bikes or youtube it. If it's not the chain then we can move onto the next thing and you will have possibly increased the retail value just be cleaning that thing up.
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post #15 of 20 Old 01-15-2017, 8:15 PM
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Re: Knocking Sound Under High load


non-Honda fleet: EX250JAF, VL1500LC, ZX600-E1, ZX600-E12
"Some people wonder all their lives if they've made a difference. The Marines don't have that problem." -Ronald Reagan
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