I have bought several parts from David and even made some visits to his shop. They are always very helpful with instructional information on how to make the parts work and get the best results from them. If you have a Grom, I highly recommend DH motoring.

This is all I use in all my bikes! BBK track bikes as well!!

Thanks.

Comes with everything besides an O-Ring

Just let the shop install my 149cc with this oil and bike sounds great!