Yamalube 4 (10W30) or SAE 10W30 type SE motor oil. 0.69 US qt. Total 0.74 US qt. This is out of 1997 owners manual. Use Yamalube 2-cycle oil or good quality oil rated for injection in the tank under the seat.
10w 40...yamalube is the best suggestion
Specifications for a Yamaha RT 100 can be found at most Yamaha dealerships. The specifications can be found at many auto-parts stores.
The head bolt torque specs for a 1999 Yamaha RT 100 is 16 foot pounds. Specs can be found in Yamaha repair books.
30,000
155mph
6
155mph
SAE 10w30 100% synthetic.
i dont know........lokk it upon yamaha .com
Use any name brand 100% synthetic oil SAE 20w40.
161 lbs
Around 75kmph