Dear RVSB,sorry to hear and please try these
1. use good 2T oil(avoid oil from petrol bunks)
2. if oil pump is not working mix oil with petrol in proper ratios(25ml per Litre)
3. check air pressure regularly, if possible try to fill nitrogen(as the rear tyre is fitted to the engine, rear tyre pressure increase very fast and nitrogen helps in maintaining it)
you can understand it from the pic
View attachment 162149
View attachment 162150
check the mileage in 45-50km/h