Title: What's that noise?
Post by: unomashabanero on May 15, 2004, 06:18:08 PM
Post by: unomashabanero on May 15, 2004, 06:18:08 PM
Spent a nice long day on my 94 GS today...halfway through ride the engine developed a metallic rattling sound whenever I gave it throttle. Most noticable in 3rd gear around 5000rpm but there pretty much constantly in all gears. :x
Bike is running normally otherwise.
Anyone have a guess what this could be?
Thanks,
Sean
:cheers:
Bike is running normally otherwise.
Anyone have a guess what this could be?
Thanks,
Sean
:cheers:
Title: What's that noise?
Post by: GRU on May 15, 2004, 06:29:11 PM
Post by: GRU on May 15, 2004, 06:29:11 PM
did you check your oil?
any loose parts on the bike?
maybe your exhaust bolts came loose and now are making noise
any loose parts on the bike?
maybe your exhaust bolts came loose and now are making noise
Title: What's that noise?
Post by: yamahonkawazuki on May 15, 2004, 08:27:14 PM
Post by: yamahonkawazuki on May 15, 2004, 08:27:14 PM
i went on a tri-state ride today, when i would stop, fuel up, when i would restart id hear tick, tick, tick, then alls fine? would rune fine, btw 4900 mi. on it (valve clearance?) :dunno:
Title: What's that noise?
Post by: JLKasper on May 15, 2004, 08:54:18 PM
Post by: JLKasper on May 15, 2004, 08:54:18 PM
Good question. My '96 does it between 3500 and 6000 rpm, like turning a switch on and off. We're not the only ones, either. On a similar thread, it was tracked down to a valve tappets rattling inside their buckets in the head. The solution in that case was to replace the head. However, it's possible the noise we're describing is coming from different sources (piston slap or crank, connecting rod, or counterbalancer bearings).
Title: All te mice...
Post by: The Buddha on May 15, 2004, 09:13:09 PM
Post by: The Buddha on May 15, 2004, 09:13:09 PM
yea, all the mice in there are scratching wanting to get out.
OK cam chain tensioner, valves clacking, ad intake manifold leak... all make such noises.
Cool.
Srinath.
OK cam chain tensioner, valves clacking, ad intake manifold leak... all make such noises.
Cool.
Srinath.
Title: What's that noise?
Post by: MarkusN on May 16, 2004, 06:37:31 AM
Post by: MarkusN on May 16, 2004, 06:37:31 AM
I don't want to scare you, but since you say the sound developed, and you describe it as metallic: could be one of the plain bearings going bad (crankstaft, balancer shaft, rods) Check oil level (because that's usually the original cause of such a failure). Drain some oil and look for bits of metal in there. If you do find metal it could be one of the bearings and you could be in for an engine overhaul.
But then, the GS's engine does have quite a slew of mechanical sounds that are perfectly normal.
But then, the GS's engine does have quite a slew of mechanical sounds that are perfectly normal.
Title: What's that noise?
Post by: unomashabanero on May 17, 2004, 09:52:14 AM
Post by: unomashabanero on May 17, 2004, 09:52:14 AM
Thanks for the replies,
I did check oil, (both a couple days before this sound started and afterwards) The level is normal, and the oil on the dipstick looks clean.
Guess I'll do an oil change soon to see if anything shows up when I drain more oil out. Might be time for a visit to the shop. :dunno:
One of these days I'll have a garage/tools to take the thing apart and start learning a thing or two about the engine!
I did check oil, (both a couple days before this sound started and afterwards) The level is normal, and the oil on the dipstick looks clean.
Guess I'll do an oil change soon to see if anything shows up when I drain more oil out. Might be time for a visit to the shop. :dunno:
One of these days I'll have a garage/tools to take the thing apart and start learning a thing or two about the engine!
Title: What's that noise?
Post by: aslam on May 17, 2004, 10:44:04 AM
Post by: aslam on May 17, 2004, 10:44:04 AM
If I had to guess I would say cam chain is rattling. You may need to replace the cam chain tensioner (can it be adjusted?) CBRs are notorious for this type of problem and I experienced it on my bike. Definitely characteristic that it only rattles in a certain RPM range.
ASLAM.
ASLAM.
Title: What's that noise?
Post by: JamesG on May 17, 2004, 11:36:05 AM
Post by: JamesG on May 17, 2004, 11:36:05 AM
Maybe you got a Cicada in your bike somewhere?
:mrgreen:
:mrgreen:
Title: What's that noise?
Post by: Kerry on May 17, 2004, 12:14:47 PM
Post by: Kerry on May 17, 2004, 12:14:47 PM
Quote from: GRUany loose parts on the bike?That's what I was going to ask. On my bike the situation in the picture below resulted in rattling at around 5,000 RPM in any gear.
maybe your exhaust bolts came loose and now are making noise
EDIT: Changed link from sisna.com to bbburma.net