Helicoil Ends can protrude slightly into Combustion Chamber. Causes Preignition and engine damage at Hi RPM. Timeserts are the proper way to do the thread repairs. If you go to all the Bother removing head do Time serts. On my Race Heads I put Timeserts in every one.
1230 - blow spark plug out of the head....... Kat
in Air Cooled
Posted
Helicoil Ends can protrude slightly into Combustion Chamber. Causes Preignition and engine damage at Hi RPM. Timeserts are the proper way to do the thread repairs. If you go to all the Bother removing head do Time serts. On my Race Heads I put Timeserts in every one.