cam chain auto tensioner

[Mr Dirt]

Curious question
Does anyone know on a yz250 f, if the auto tensioner (cam chain tensioner) if the oil pressure is part tension on the chain.
Some old 350 Honda motors I be leave used oil pressure
I hope some one under stands my question.
Thanks

 

[Rich Rohrich]

The Yamaha YZF & WRF engines use a purely mechanical tensioner. The oil pressure has no influence on the tension applied.