Question about Aprilia RS 125 Motorcycles

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Could you tell me what gearbox oil i should use on my rs125 I am just putting a new clutch in !

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Light gear oil buddy

Posted on Oct 08, 2009


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Is there oil in the gearbox? Is it really dirty? Lack of oil and dirty oil could account for the clutch problem. If you have put synthetic lubricant in the gearbox that could also account for the clutch. Synthetics can swell the cork on the clutch plates. New fiber plates would be needed.

The shifting problem could be tied to the lack of oil or dirty oil but usually the problem is bent shift forks. If fresh oil doesn't fix the clutch the clutch will need to be inspected/repaired. If that doesn't also fix the shifting, ( and I don't think it will ), the engine will need to be torn down and the shift mechanism inspected. Forks will likely need to be replaced.

Jul 15, 2010 | 2008 Yamaha Yamaha G5

1 Answer

My transmission makes noise until I depress my clutch

sounds like the main shaft bearings within the gearbox itself. i would of said the release bearing but u already changed it. the main shaft doesnt spin with the clutch pedal pressed. check for oil leaks and check the oil level in the gearbox.

Jun 20, 2010 | 1993 Ford Mustang

2 Answers

My renault scenic i hard to change gear

possible clutch cable or cluth itself, check the clutch cable first to see if its stretched, i didnt check and put a new clutch in ,and wasted £250 , try euro car parts for cheapest clutch cable.

May 17, 2010 | Cars & Trucks

1 Answer

New clutch it's already install but still shift noising

Make sure there is enough transmission oil in the gearbox, without oil the synchro's cannot work so gearchanges will be slow and cumbersome. If filling the gearbox oil dosent help maybe you have gearbox damage - have the gearbox checked out.

Jan 25, 2010 | 1990 Toyota 4Runner

1 Answer

2005 kdx 200 clutch not engaging properly

Assuming the clutch handle on the handlebar is adjusted properly, only three things will cause the problem.
  • Very dirty oil in the gearbox. The grit is causing the clutch to drag. Change oil, ride for an hour in the city then change oil again to flush out the grit.
  • Worn clutch lever (at gearbox). Lever is not moving the pusher far enough to fully disengage the clutch. A new lever would be needed.
  • Synthetic lubricant ( or oils with "special" additives), was put in gearbox. 10w40 motor oil should be used in the gearbox. Synthetics can swell the cork on the friction plates causing the clutch to drag. New friction plates will fix the problem.
The current amount of clutch drag is not enough to harness the power of an engine rev. That is why the clutch seems okay at higher revs. Please rate my answer. Thanks.

Jan 14, 2010 | 2005 kawasaki KDX 200

1 Answer

How do i fix my handle for the clutch cause it got very loose and it doesnt even go back up once i squeeze it, i cant even change it to gears and i tried tighten the little knob where you can loosen it or...

If you put synthetic oil in the gearbox that is the problem. Synthetics can swell the cork on the clutch friction plates causing the problem you describe. New friction plates and a change back to standard 10w40 motor oil is what will be needed.

If standard 10w40 oil is in the gearbox then it may be very dirty. If so, drain it then put in a new filter and fresh oil. Ride the bike for an hour or so using the clutch often then drain the oil and install fresh oil. This will flush out the grit that can cause the problem.

About the only other things that could be causing the problem are a badly frayed clutch cable, a badly worn clutch arm assembly (at the gearbox), a dirty clutch arm assembly, a broken spring, a clutch that has been messed with and re-assembled or adjusted incorrectly, and a bent clutch pushrod.


Oct 23, 2009 | 2008 Suzuki GSX-R 600

1 Answer

The clutch started slipping. is there a way to ajust it. what would cause it to slip if it not ajustable. it only has 14995 miles. the fluid was low. i filled it

Ah yes! The missing clue! You put more stuff in the gearbox. But what exactly did you put in it? Motorcycle engines do not do well using synthetic oil, or oils with "special" additives or "friction reducers". Drain whatever is in the gearbox and refill with 10w40 motor oil. Shell, Mobil, Quaker State. Any major brand will do. It may require a one hour ride and a second oil change to rid the gearbox of the synthetic. Clutch plates that swell are usually toast. Plates that just slip usually recover after awhile. Install a new oil filter. Look it up in the manual. See below.

A “very helpful” rating on this answer? Thanks!


Jul 04, 2009 | 2004 Suzuki VS 800 Intruder

2 Answers

After changing the gearbox oil on my aprilia

Dump the special oil and go back to 10w40 motor oil. The manufacturer does not recommend any "special" oils be used. They can cause the clutch friction disks to swell among other problems like you currently are having. If possible, stick with the name brands; Shell, Mobil, Pennzoil, Quaker State, etc.. It may take awhile to rid the bike of the synthetic oil but get it out of the gearbox as soon as possible.

Please take a moment to rate this answer. Thanks Tim.

May 04, 2009 | 2000 Aprilia RS 125

1 Answer

1992 Ranger xlt 3.0 Manual 5-speed (Any clutch adjustments?)

FORDS ARE OK if the noise u are hearing is going away when u press the clutch it sounds like it is comming from the gearbox. the gearbox stops turning wheh u hold the clutch in is the gearbox noisey when u dive it 1-2-3-4 this will let u know if the gearbox is worn
is oil level ok ? check it and transfere case

hope it helps let me know if u need more help

Dec 19, 2008 | 1992 Ford Ranger

2 Answers

Clutch cable's change

If this is the same as the RS125 cable i changed then the cable goes into the clutch cover engine casing yes? You do not have to take the whole engine apart you need to disconnect the cable from the lever and then you will have to take the clutch cover off. before you do this you will need to lean the bike on its side as you will lose the gearbox oil otherwise. plus the cluch will fall out as it is held in with dowels and not bolted (stupid design) once you have the cover off then you can disconnect the cable. if your gentle when taking the cover off then u will not have to replace the gasket however this rarely happens you will deffianly need to get a new gasket about 4quid. reconnect your new cable and then put the gasket on and be carefull wen putting the casing back on the engine making sure you do not damage the new gasket.
hope this helps.

Nov 10, 2008 | 2008 Aprilia RS 125

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