YX160 / ZS155 VMC ergal engine exhaust silencers

VMC ergal exhaust valvecover for Pitbike engines YX160 / ZS155.

Ergal exhaust valve end-cap for Yx 150/160 and Zs 155 engines

Engines with higher torque and lower revs are best matched with standard type coilovers and springs, whereas engines with lower torque and higher revs have to be fitted withhard springs to avoid valve float.

A significant fact is that when downshifting sharply, the engine isover-revved, and this can lead to the valve touching the piston.

On very twisty circuits where the engine is constantly revving athigh revs, it is recommended to mount the hard springs, on the other hand, on circuits with very long straights where the engine is revving at medium revs and there are nosudden downshifts , ergal coilovers are recommended together with original type springs.

In this case, the intake and exhaust cup is designed for each valve, so be sure to mount each one where it belongs.

It is recommended to follow the standard 0,10 intake 0,15 exhaust setting with these cups