Strange sound from transmission
Hi wondering if you might know whats going on here. Got some theories, but dont have much experience with bikes so here goes...
Recently noticing a low pitched metallic rubbing sound coming from the bottom of the bike (difficult to tell exactly). I hear it at slower speeds (not related to engine speed) - if I pull in the clutch, let go of throttle and roll along I can hear it quite clearly and it changes with road speed.
Now I did an oil and filter chnge about 1500 miles ago - admittedly used some cheapo oil from CTyre (was jaso and corec viscosity - but cheap mineral based). Oil level is good though. I also tightened up the chain about 300 miles ago, and may have cranked it up a bit too tight, but since loosened it off - no change.
Here's a theory or two, could be way off - if I over tightened the chain, could this have put a bit of pressure on front sprocket, and now I am hearing a worn sprocket bearing? Or could the cheapo oil I used be coming back to haunt me with some tranny noise even after 1500 miles?
Oh yeah bike is 1997 bandit 600 with 24000 miles on it
this is my...boomstick!
Your bike is a VERY solid and proven drivetrain. Money on stupid stuff like the chain still hitting something like, running on the rub block on the top of the swingarm. If you pull in the clutch, you essentially disconnect the engine from the rear wheel, making it unlikely the trans/engine is it. Typically, when you load it up, is when you get trans noises, if there are any.
The countershaft is supported by bearings but, it's not that bendable. You'd have to have the chain stupid tight and hit a good bump to even think about transmitting any major shock to the internals of the trans on a road ride. The chain will give way before the countershaft will bend.
Check the brakes as well, a chunk of road crud at the pad edge can make noises. Check your axle nuts for correct torque and wheel bearings for lubrication (it wouldn't be the first time I'd seen a dry bearing on a bike).
And btw, ANY oil that isn't energy conserving will work just fine in your bike. Particularly given the short change intervals bikes usually get.
Thanks for the advice CR.
I am hoping you are right - could be something like the chain rubbing (that's kinda what it sounds like now you've mentioned it). I'll check it out. Don't think it's brake crud - no change when applying brakes.
Yep chain rubbing sounds like a good bet - I'll take a look.
Took your advice, removed the sprocket cover, degunked the whole area, was very scummy. Also cleaned up the rubber runner thing the chain slides along on the swingarm. Noise all gone Fantastic! big thanks!