Whining in the engine.

[TBrax]

Hey,

I just had my shifter spring replaced at a shop adn they got it up and running. AFter they fixed it, and cranked it up, a severe whining noise is coming from the ride side of the engine at idle and when giving it gas.

Any ideas on how to fix this would be awesome.

[ducpainter]

Is it coming from inside the right case or up higher by the belts?

[TBrax]

Oh this might help, i have a 06 620..
but it sounds like its coming from the side of the bike where the 2 belts meet

[stopintime]

Replacing that spring requires removing the clutch.

Maybe something went wrong there?

[motoxmann]

did they re-tension the belts? belts that are a little too tight can whine sometimes. and actually, I just re-adjusted my belts 100 miles ago using the factory frequency method, and mine just started whining a little yesterday. so even at factory spec it's possible for the belts to whine a little

[TBrax]

yes they took out the clutch and it doesnt sound like it is coming from the clutch at all. And the whining is louder than my exhaust and my exhast it pretty loud.  do you think this is something to be concerned about?

haha sorry im just trying to avoid driving 2 hours to the closest duc tech.

[ducpainter]

It could be a pulley bearing.

The consequences are worse than the trip to the shop.

[stopintime]

I think the best way to deal with this is to contact the shop that did the job.
Ask them to identify/locate the noise and fix it. Free of charge if it's related - if not related, you pay.
If they can't identify/locate - tell them you're taking it to someone who can and if it turns out the job and the noise are related - they pay. 

[motoxmann]

I agree. I"m actually waiting on the cam bearings I ordered 2 weeks ago to get here, because I cooked my cam bearings a few months back before I knew how to properly adjust the belt tension and overtightened them.

sometimes the tensioner roller(s) can whine too.

either way, its more than likely a cam or belt related bearing, or the belts themselves

[TBrax]

When they replaced the spring they didnt get into the right side of the engine, so i do not believe the shop that worked on it is to blame. It could have been all related when the spring actually broke. I was riding and it broke and it would not allow me to crank it anymore so thats why i think it could be related.

but ugh...i guess ill make the drive.

but any other suggestions would be greatly appreciated to help avoid this drive.

Thanks everyone for the help!

[BK_856er]

If your shifter spring broke and a piece it messed up your sprag so you couldn't crank, I'm wondering if those components are currently functioning correctly.  Or maybe other bearing damage or incorrect reassembly of the flywheel.  Sometimes the broken shifter spring will grind on and damage the small gear behind the flywheel, resulting in a whine.  If the whine is louder than a loud exhaust it's probably something to be dealt with asap.  If it's tensioner or cam bearings then it's just a coincidence and likely not related to your shifter repair.

See pic below for a visual.  That shifter spring comes within mm of the gear in normal operation.

BK

[TBrax]

yeah thats what my mechanic said, that a piece of the spring could have easily gotten lost some where and grinded on a gear or something. if this is the case could it be something i could easily fix since it is a dry clutch?

[BK_856er]

yeah thats what my mechanic said, that a piece of the spring could have easily gotten lost some where and grinded on a gear or something. if this is the case could it be something i could easily fix since it is a dry clutch?

Easy is relative.  Seems to me someone needs to take apart the alternator cover where the shifter spring is, remove the flywheel and carefully inspect those gears tooth by tooth off of the motor.  Does not take much gear damage to cause a whine.  Maybe the gears could be "dressed" with careful filing, but the proper fix is to replace the gear and its mate as a set (assuming that is the issue).  Clutch should have nothing to do with it, but I'm not there listening to the bike, so who knows.  Sometimes sounds can originate from weird places and throw you off.

Your 620 has a dry clutch?

BK

[TBrax]

ha maybe it doesnt, i swear the more and more i talk about the tec stuff of my bike the more and more i feel i know....

but like i said im just trying to avoid the 2 hr drive there and 2 hr drive back for a 5 min fix.

but yeah after listening to yall id say its what i need to do.

[krista]

Anecdotal feedback about the belts and whining. Any change to the belts can cause them to whine. Whining happens when the rubber belt wears down the steel sprocket to more perfectly match the teeth. As the belt seats down into the sprocket, it skips the last little bit. Soon enough, the steel is worn away and the whine stops. Happens with OEM belts, our belts, and as mentioned above, with a re-tension.