With the Big Bore Kit, the motorcycle not only attains clearly more displacement but also juicy 80 PS extra with a torque at 92 Nm. Thereby more driving pleasure is guaranteed. Moreover, great care was taken to a low weight by the Big Bore Kit. In this category you can find the Big Bore Kit 1070cc Performance Plus with a connecting rod length of 151,5 mm, the Big Bore Kit 1070cc Touring with a connecting rod length of 150,5 mm and the Big Bore Kit 1070cc Standard with a connecting rod length of 151,0 mm for BMW R100 models from 1981. The connecting rod with two connecting rod screws are also available seperately in the different lengths. The connecting rod screws Racing and ARP L19, a socket 3/8 inch SW and the assembly paste "Molybdän are the suitable mounting material for your connecting rod. We provide a replacement with the piston 98,000x60,650mm, seperate with piston rings and piston pins or lock rings. You can also acquire at our house piston pins, C-rings for the butt stock catch and sport rams. With the piston rings you have the choice between the MR-rings as piston compression ring and the GSF-ring as piston oil scraper ring. Moreover you can find in our shop a cylinder 98mm as spare part without protective tubes / stay bolt and a seal insert for cylinder for converted motors from 9/1980.