Introduction
These 6 steps explain to remove bottom and top covers.. at the bottom side remove the plate (2 screws) which hold the flywheel axle.. this is your opening to replace the 2 belts, forst the biggest belt for the flywheel, the the midsize belt for the drive.. all good..
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            These are the 3 belts needed (if all) for the TK125, the biggest is needed for the flywheel, the midsize of for the drive and the smallest of for the counter. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.