Review on Engine Cylinder Adjustable Pieces Diameter by Johnny Black

Did an excellent repair on a 1980 850cc 4 cylinder motorcycle and did a great job. There were a few spots that felt a bit rough and they smoothed them out and added nice spiral hatches to the cylinder walls. Application tips: 1. Work slowly, put the drill in the lowest gear and make about 4-5 revolutions per second. 2. Don't push or pull the bricks past the middle (the pins they spin on) or the bricks will pop out at the end and you'll have to stop and reinsert the bricks into the cylinder .