|
|
| *Vultures Knob>>>Bicycle Shop |
1987 CBR 600 Hurricane, engine noise - a rattling from up front. Any ideas? |
Hey all. the CBR has 30K on it, I bought it a couple months ago. One of the things I had done while it was in the shop was have the cam chain tensioner replaced, the bike was making a similar noise as it does now when the engine is in the 3-6K rpm range. It seemed to fix it. But now it's back and I suspect either the cam chain is bad or the tensioner needs to be adjusted, although I've heard that the cct's on the Hurricanes were complete units and couldn't be adjusted manually. A friend today said it sounded like one of my exhaust headers was loose, I tightened them and nothing changed. I guess that's everything, thanks. those bikes were famous for a cam chain tensioner going bad but they are an easy fix More than likely its the valves need to be adjusted. Bikes generally need the valve adjustment around 15-20K. Seeing the age of the bike, and the millage being over 20,000 miles. I would be suspicious of the valves needing said adjustment. If the previous owner never had it done, it will probably need it. If you rev the engine up a little and let it come back to idle, you can usually hear it better for a few seconds as the engine settle back to idle, If that is the case try to get them adjusted. At the same time you can have the tensioner re-looked at, anything is possible, bad parts do get shipped or things do come loose. Experience tells me that a second look will save you money and maintain safety down the road. Hope this helped Hard to tell from the provided information. Does the sound rise in pitch or frequency when you rev the engine? I'd expect anything that's spinning the same speed as the crankshaft (like your cam, and cam chain) to do that. I wouldn't expect the exhaust flange to do that. Similarly, check to see if the noise still occurs when you pull in the clutch. That can further narrow down where the origin of the noise is. I've found it useful to use what's called a "mechanic's stethescope" to locate mystery noises. Take the blunt end of a long screwdriver and place it against your ear. Then, place the tip of the screwdriver against various engine parts (it'll be helpful to have the plastic off, of course). When you touch the tip to the part that's actually making the noise, or close to it, the sound'll be much louder. And no, the above is not just a joke to make you look silly. Make no mistake, you'll look silly while doing it, but it's quite helpful. Good luck! That happended to me once. Then I realized it was from when I smashed a tree doing 120. I make sure to keep it under 100 when in the city now. put your bike in the top gear. its prolly 5th. then roll it backwards so the wheels turn a few revolutions. thats what i had to do on my 06 636, because the automatic chain tensions suck. best of luck man. also check out a honda or cbr forum. |
| Tags |
| Cycling Bike Race Bike Insurance Bike Repair Bicycle Shop Bike Tours Trail Map Bike Pedals Bike Lock |
Bike Categories--Copyright/IP Policy--Contact Webmaster |