Ergal exhaust flange YX160 / ZS155 engines VMC

Ergal retainer for VMC exhaust for Pitbike YX160 / ZS155 engines.

Ergal retainer for the exhaust valve of Yx 150/160 and Zs 155 engines.

Engines with higher torque and lower revolutions work better with standard-type retainers and springs. On the other hand, engines with lower torque and that reach higher revolutions require hard springs to avoid valve float.

A significant fact can be observed when downshifting abruptly, the engine remains at very high revolutions, and this can mean that the valve may touch the piston.

On very twisty circuits where the engine is constantly at high revolutions, it is recommended to install hard springs. On the other hand, on circuits with very long straights where the engine runs at medium speed and there are no abrupt downshifts, it is recommended to use ergal retainers together with original-type springs.

In this case, the intake and exhaust retainer are designed for each valve, so make sure to install each one in its correct place.

It is recommended to continue using the standard adjustment 0.10 intake 0.15 exhaust with these retainers