Laser Professional Leakdown Tester Wheels and Drive Chains Yamaha claim in their manuals

Yamaha claim in their manuals that they can't be taken out and death will be the reward for those who try :)

60 minutes per refill

Although just 160mm long

It not only gets them out more easily but also removes them in such a way that you could re-use them if they were in good condition originally

Laser Professional Leakdown Tester Wheels and Drive Chains Yamaha claim in their manualsThis is a serious professional leakdown tester. Most only work at much lower pressures, whereas this one works at up to 100psi (7bar) enabling it to detect leaks far more quickly. Unlike a basic compression tester that can on occasion give misleading information, this tool is never fooled. If you have a valve leaking, you can hear the air escaping through either the inlet or exhaust port identifying the culprit quickly and easily. If the combustion