Park the motorcycle on a raised platform like a wooden plank or stone slab.
The rear wheel should be raised off the ground with considerable space for the wheel to rotate freely
Start the vehicle and run it in first gear for a few minutes to warm up the gearbox fluid.
If you decide to drain the fluid, open the lid bolt using 18mm socket wrench and add some engine oil or kerosene before warm up. This loosens the entire gearbox fluid and helps quicken the draining
If you plan to only top up fluid you can directly goto step 16
Use 18mm socket wrench and remove the gearbox fluid filling or lid cap/bolt
This is the bolt that is the lid for gearbox fluid filling.
You can choose to open it using 18mm spanner as well, but be careful not to spoil the grease nipple nearby
Again using a 18mm spanner remove the drain bolt at the bottom of the gear box. Note : if you are topping up fluid you can skip the removal of drain bolt and go to step no 16
This is the drain bolt. Picture is taken from the bottom of the motorcycle.
Remove the drain bolt using a 18mm spanner or socket wrench
Picture taken from the bottom of the gearbox for better understanding the scenario
Remove the bolt. Note : keep a pan underneath the gearbox to collect the old fluid
Once you remove the drain bolt, fluid will start draining out
Wait for around 15mins or more for the fluid to drain out, the transmission fluid is very viscous in nature ( especially the pre filled fluid from factory ). Step 4 helps quicken draining
Using 14mm spanner or socket wrench remove the level indicator bolt.
Remove this bolt that covers the level indicating hole. You should add transmission fluid until it starts spilling from this hole.
Close the drain hole with the drain bolt. Make sure you clean the bolt and also do not forget to use a fibre washer. Please be very careful not to strip the threads on the drain hole.
Tighten using 18mm spanner. Do not over tighten and spoil the threads
Ideally full hand tight and then a quarter turn using a spanner would be fine.
Keep a funnel in the fill hole
Use any transmission fluid of your choice. Ideally a mix of grease and transmission fluid is recommended
Pour in the fluid
Until it starts dripping from the level indicator hole
Close the level indicator hole with the cleaned 14mm bolt. Don't forget to use a fibre washer
Close the level indicator hole and tighten fully by hand
Using a 14mm spanner or wrench
Torque the inspection bolt
Use the cleaned lid bolt and close the filling lid hole
Always hand tighten bolts and then use spanner to torque bolts gently by feeling for tightness. Note : Over tightening bolts on engine casings made of aluminium are very easy to strip threads.
Torque the lid bolt using a spanner or wrench. Take care not to spoil the grease nipple
Clean the engine, gearbox surfaces with a cloth. Wear a helmet and go for a test ride, check for leaks and tighten bolts as required.