I am trying to figure out what lbs is acceptable for a 2004 Bruin 350 engine. I finally found a quad for my family so we can ride. It looks a little dogged and has little compression I am going to run a compression test but have no idea what is acceptable. Thanks

 

Standard is 121 psi, minimum is 114, max is 128.

 

One thing I suggest is to switch the oil to a synthetic. My g/f's 04 Bruin started burning oil on start-up due to worn valve guides no doubt and when I switched from Yamalube to Amsoil 0w-40 atv oil...the smoking stopped. The engine runs smoother and idles a hair faster.

The oil ain't cheap but neither is rebuilding a Bruin engine and oil is the lifeblood of any engine.