Gilera Runner 125 SP Gearbox Whining! HELP PLEASE!

When I rotate my hub I can hear the gearbox whining!
I've tried everything I stripped it cleaned all the shafts and cogs made sure all the parts were correct for my gearbox (rolling nut type) oiled up everything put it back together rotated the hub and sounded smooth no whining.
Done side case up and the whining is back again!?? What could it be please help, below is a link to a video of the whining please help any suggestions welcome! Thank you in advance!

 

Cleaned it all out!

 

have you got oil in the gearbox?

 

Yes of course I have oil in it lol

 

just making sure. some idiots don't.

 

Haha.
Any other ideas, as I'm all out of them!

 

Some trannies just whine. I've done what you did, complete strip, changed ALL the bearings etc. No dice. I think it's the tolerances with the gears. If the bearings aren't lumpy when you turn them with your finger, cogs out, don't sweat it. Yours looks pretty fluid, despite the noise. My malossi gear up kit is great. The Polini gear up kit is very sticky. The Malossi whines , the Polini does not. Go figure.

 

So what you reckon I should do? Leave it how is and ride it? I dread to think the sound haha

 

How the hell did u get ur engine that. Clean
I have been trying to clean my enigne
By using degreasers not happing lol

 

It's sand blasted mate

 

Sound's pretty normal to me, most gearboxes whine when wheel is turned.is the intermediate gear on the input shaft on the same way it left factory? It may sound daft but it can be put on backward's, yes it will go on any way but if it's been run for years from new it need's to be fitted the same way! Year's ago I fitted a gear up kit to a GT 200, didn't improve much so re fitted std gear, it whined terrible until I turned it round.

 

Wow how much did that cost ???

 

I live in south London
Where did u get it done

 

Yeah it's on the right way mate everything is.

 

The sand blasting was done on the casings before I bought it.
I bought it from a guy who had the casings flowed and sand blasted, however he never got around to using them so sold them.
The flowing and sand blasted was done by a 2 stroke tuner: MGT / Mario Gilera Tuning.
He has a work page on Facebook, look him up good guy and reasonable prices.

 

nice work. Looks like theres been a bit of repair of the surfaces. Use good sealant when you rebuild. Not that blue shite.

 

I've actually already finished the build, and I actually did use some blue sealant didn't know it was of bad quality?
Looking to run the engine soon but want to sort out the whining noise out first though... So close but yet so far haha

 

If you did it right it will be OK. But red CAFF is where it's at.
Nice looking block. Never seen cleaner!

 

Alright, thanks!
It was my winter project built it up from bare casings with everything brand new down to every single screw, nut and bolt

 

man thats clean, need to get my lump to a sand blaster