gilera dna 50cc 2stroke rattly gearbox/gears need a mechanic

[dna50]

my gilera dna 50cc has a rattly gears and this is also causing slow pickup. i have taken the side casing off to make sure it isnt the clutch and iv taken the clutch off and turned the wheel and the noise is definately coming from the gears even a garage checked it. they say it could be the gears are worn or it could be bearings but are charging too much to fit it. how hard are they to fix? and is there any mechanics around the west london area that have reasonable pricing. thanks a lot
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hsaeed

[joshdudeha]

Rattly gears? Do you mean the rollers in the variator? Because it's a variator automatic CVT thingy and doesn't have "gears" as such but the variator and the clutch on either ends.

If you take the variator off (normally behind the belt) and take it apart you'll see 6 rollers in there. Check if they're squared off, if they are this will definitely be the problem. The clutch is on the right of the drive, next to the wheel and the variator is on the left on the crank shaft.
If they are squared, get some new rollers - try a few sets ranging from light ones (I think they make easier pick up) to heavier ones (for a better top speed correct me if I'm wrong).

Hope this helps
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Piaggio Zip 50 -> Yamaha YBR 125 -> Kawasaki GPZ500S '96 -> Suzuki GSF600N Bandit -> Honda CBR 600FW
Theory Test: 13/07/2011 Passed! | Mod 1: 27/07/2011 Passed! | Mod 2: 17/11/2011 Passed!!!!!

[dna50]

i know what rollers are and i have changed them already this noise is definately the gearbox the garage have checked it and they have confirmed this. the noise is coming from next to the back wheel where the gears are. its really rattly like somethings loose when the wheel turns
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hsaeed

[joshdudeha]

[dna50]

yes it has gear oil in it and yes thats where something is wrong. the garage are charging 120 labour just to take it apart and put it back together after fixing that doesnt include parts im just wondering how hard is it to do or is there a more reasonable priced mechanic around west london
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hsaeed

[Nope.]

Just strip it down yourself. It should only take a couple of hours and should be a good mechanical learning curve for you.
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400

[dna50]

everytime i try and fix something on the bike i always seem to break something. so with this id rather let someone with the brains fix it and im not at all familiar with the gearbox setup
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hsaeed