Part 10 Yamaha blaster aftermarket Chinese cylinder corrections; lapping undulating surfaces flat 

Here we are have a Chinese aftermarket Yamaha blaster cylinder, a quick comparison to show it's downfall WRT port timings & cheap piston construction; we are working on correcting the transfers port updrafts to enhanced OEM standards
#Yamaha #YFS200 #port #porting #blaster #boyesen port #chinese cylinder #port corrections # lapping # lap