RS125 vibrating LOADS please help!!

[callum.s09]

hiya guys i was riding home from college to day when my bike became a little bit sluggish and started to virbrate loads i mean my feet and legs were tingling i was thinking a bearing in the engine might be f****d but if you could help guys i reli appriate it.
THANKS CALLUM

[dogwafter]

[andy_uk]

The balance gears failing would cause the excessive vibrating. But like dogwafter said, it could be various other things causing this.
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Aprilia Classic 125, GS500E, ER5-A1, ER5-C4, ER6 & an XJ6 project frame...

[callum.s09]

Cheers guys well when its idleing its not vibrating bad but its worse at 5-6 thousand revs but still vibrates at higher revs, feels horrible, well il try new plugs and make sure everythink is secure.
thanks

[Matt-]

Get your wallet out, bottom end rebuild time
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RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[callum.s09]

ohh dear reli hope its not i was hopeing it wouldnt break down cos i wanna px it for a 600 soon

[andy_uk]

Check the engine mounting bolts firstly.
I assume the vibration increases with the revs and not with the speed of the bike?
(i.e. is the vibration still apparent in neutral?)

If the bolts check out okay and the vibration is linked with revs and not speed then definitely check the balance gears and shaft. (not that difficult to do)
____________________
Aprilia Classic 125, GS500E, ER5-A1, ER5-C4, ER6 & an XJ6 project frame...

[callum.s09]

[Matt-]

You will be very lucky if it's an engine mount, then engine would have to be falling out to make any sort of " Big " Vibration.
____________________
RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[thomp1983]

very unlikely it's an engine mount, there's 4 of them and i doubt you'd get much vibration with one undone. as has been said id be looking at the balance shaft gears and bearings, the gears are a service item and fairly easy to access, the bearings are an engine split job and will be costing £100+ in parts alone, as it'd be pointless just replacing the balance shaft bearings with the casings split

chris

[andy_uk]

If the balance bearing has gone, I'm pretty sure it can be replaced without splitting the case.
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Aprilia Classic 125, GS500E, ER5-A1, ER5-C4, ER6 & an XJ6 project frame...

[thomp1983]

balance shaft has 2 bearings, front one just behind balance shaft gear with circlip should be replaceable with the engine in one piece, the rear one inside the gearbox isn't

chris

[Kickstart]

Hi

Engine mounts are easy to check. But balance shaft gears would be my first guess. They are service items. While the bearings might have gone I would order the gears and check the bearings while changing gears

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[andy_uk]

[Vincent]