Hi,iv just bought a honda mtx125 moto x bike can anyone tell me how/where to check the gearbox oil?

Answer 1

remember that the engine and tranny oil are one and the same...check the sight glass and change it often as clutch particles are in there.

Answer 2

Always give year, make, engine size and model # when asking questions. We need all of that info to give an informed answer.
The year could make a difference
On the right crankcase cover (clutch cover) is an oil level check bolt.
Hold the bike straight up and down (as if you were sitting on it).
Remove the oil level check bolt.
Add oil, until oil starts to come out of the hole.
When the oil stops draining, install the bolt.
http://www.mrcycles.com/
Go to - Honda Motorcycle Parts - 1996 - CR125R - Right Crankcase Cover - #8

Answer 3

typically, there is a small site glass (less than 1 inch/25mm diameter) on the right side engine case, close to the foot peg. not sure on this specific model. the oil should be about 1/2 way up to 3/4 way up the site glass.