do any of the manufactures of 4 stroke engines have a non interference construction. if a timming belt breaks i would like to not bend any valves. thanks
Or do any use gear drive to turn the cam- or chain drive? My old Bearcat uses a geared shaft drive for the cam. Are all the newer 4 stroke motor's cams driven by belts?
hello<br /> yes yamaha has a list of engines that the pistons will clear the valves in the event of a belt failure. do the maint and you will never have a problem. do the maint or do the repairs either way I get a paycheck <br /> good luck and keep posting
Yamaha also has a design that eliminates rocker arms. <br /><br />Suzuki uses an enclosed oil bath chain drive, much like the timing chain system on older automobiles.<br /><br />I can't remember hearing the last time someone's timing belt broke.
The DF60/70 won't have the chain drive. <br /><br />But you'll find it in their DF25, DF30, DF40, DF50, DF90, DF115, and DF140. The DF25 and DF30 are single overhead cam.
