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Post by fromm92 on Oct 19, 2018 14:51:00 GMT -6
I have a ‘90 model with 26k on the clock, just recently started hearing a whistling/whining noise. That’s the best I can call it. As soon as throttle is applied up until the engine noise overcomes the whistle, the whistle sound gets progressively louder. But when coasting or idling can’t hear the sound at all, only under any acceleration. Any ideas?
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Post by Blaine on Oct 20, 2018 5:53:26 GMT -6
I have a ‘90 model with 26k on the clock, just recently started hearing a whistling/whining noise. That’s the best I can call it. As soon as throttle is applied up until the engine noise overcomes the whistle, the whistle sound gets progressively louder. But when coasting or idling can’t hear the sound at all, only under any acceleration. Any ideas? I would guess belt..Check to see that it is alined & properly adjusted. |
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Post by knoizy on Oct 20, 2018 11:55:21 GMT -6
On an previous bike I spent weeks trying to find a noise that was only there at 5k-6k and from the riding position I became convinced it was the cylinder head. Then my dad sat on it and and revved while I listened around the bike and I quickly found it was a dodgy chainguard fixing that only rattled at 5k, two minute fix and good to go. My point being its hard to locate a sound on the move and if you can get it to make the noise when stationary it might help to find the source. 100% it could be the belt as Blaine says even that you might be able to hear in more detail if you can safely run the bike at home with the rear wheel cleared off the ground.
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Post by fromm92 on Oct 20, 2018 19:56:22 GMT -6
I’ll look into checking the belt. My fear is the fact when riding it sounds like it’s coming from under, or even in front of me. Like it’s from the engine. But sounds can be hard to pinpoint while riding. So hopefully I’m just crazy
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Post by Blaine on Oct 21, 2018 6:17:31 GMT -6
I’ll look into checking the belt. My fear is the fact when riding it sounds like it’s coming from under, or even in front of me. Like it’s from the engine. But sounds can be hard to pinpoint while riding. So hopefully I’m just crazy Also check front pulley for play on the shaft...(This is common)..You can pack it with grease till you get a replacement. |
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Post by fromm92 on Oct 21, 2018 10:18:11 GMT -6
Oddly enough I can’t find anywhere on the internet an explanation or video of how to check the belt alignment or checking that pulley. Can you kinda explain how I go about doing them?
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Post by knoizy on Oct 21, 2018 15:49:27 GMT -6
Pulley - remove cover and retaining bolts/clip you should be able to slide pulley off with the belt. Put the pulley back on the shaft and feel for any play in the fitting even a tiny amount is enough to be noisy so pack the splines with grease and refit the pulley & belt.
Alignment - many methods exist one is to slacken both rear wheel adjusters and set the belt tension it should be slacker than most people would believe and the front pulley is the first casualty of over tightening, if you have to eyeball it look for roughly an inch of movement mid belt with a couple of fingers pressure. Using a tape measure go from the centre of the swing arm bolt to either the adjuster notch lines or spindle centre (or any point you can mirror on both sides) and align them as precisely as you can. Also, with the front safely held down you might be able to see any belt alignment issues with the guard removed and bike running in first.
Do them both if you want to be quick or if you want to know the details do the pulley first then go for a ride to check the results. Sounds like you don't have the workshop manual, get one!
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Post by fromm92 on Oct 21, 2018 16:46:24 GMT -6
Yeah I don’t have any manual of any sort. Bike came from my father in law and he got it like 5 years ago. So I’m just using the internet and this forum for pretty much all technical advice and whatnot, plus I’m not mechanically inclined at all lol
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Post by bikeman on Oct 22, 2018 4:05:08 GMT -6
I would suggest you buy a manual and read it all the way through. it explains things far better and in far more detail than information gained on the internet or through a forum. start with easy jobs buying the tools required as and when needed. internet information [including forums] can be misleading as the writer has no idea of the level the compitance of the person asking the question.
I will give you an example. A guy wrote on another forum about his difficulty of removing some part he want to change. and wrote it had taken him 2 days trying to remove it without success. one member answered [me] saying that the reason he was having difficulty was because the bolt he was trying to remove was a left hand thread. the next post from the guy said "what's a left hand thread" now I know we all had to start somewhere but trying to fix something that could potentionally kill you if it goes wrong isn't the best idea.
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Post by fromm92 on Oct 26, 2018 15:23:14 GMT -6
An update to my strange noise. With the bike parked, in neutral, I can rev up the bike and with my ear down low towards the front of the engine I can hear the whistle/whine. Probably midway thru the rpm range, can’t pin point where it’s coming from though
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Post by knoizy on Oct 26, 2018 17:19:15 GMT -6
Get a length of tube a couple of feet long and hold it like a stethoscope with one end to your ear and the other to the engine while someone revs it for you. Move it around and that might help you to locate the sound.
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Post by yaatri on Nov 21, 2018 15:30:25 GMT -6
Great idea knoizzy. I bought a cheap 3$ stethoscope with a pick, after using a long tube for years, Unfortunately, I can't use it as I haven;t got the bike with me yet.
Instead of starting a new thread, allow me to piggyback on this one. What if whining noise is audible when the clutch lever is pulled in, engine has slowed down (less noise) before it has stopped completely. It's possible that f the whining noise exists at higher rpm under normal operation too but it might not be audible. I think it can't be coming from the engine. It has got to be something to do with the transmission system, the belt, output pulley, the wheel pulley or the bearings. I have not had a chance to hear it while riding the bike so I don;t know if it's coming from the front of the bike-possible cause front wheel bearing, speedo cable, , from under the fuel tank--possible causes some thing in the transmission, transmission output pulley, the belt; or the rear wheel---rear belt sprocket, belt or the bearings in the rear wheel hub. The noise did not sound like it came from the rear brake. I would appreciate your comments on adding possibilities or ruling some out. Thanks all in advance.
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Post by Blaine on Nov 22, 2018 6:38:14 GMT -6
I would unhook tach cable to elinimate it as a cause.
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