I have a 1995, 29 foot Scarab with twin Mercruisers 350 mags., the port side motor blew and i rebuilt it. After a break-in period and a few more runs it suddenly developed a bad spark knock. I have turned the timing all around and can't get it out. I switched the knock sensor and the knock module with the other engine but it didn't follow the motor.
Any suggestions.
I was wondering if it could even be mechanical like jumped valve timing or something. I don't mind pulling the motor but want to know the problem is inside bofore I do.
Please help.
Any suggestions.
I was wondering if it could even be mechanical like jumped valve timing or something. I don't mind pulling the motor but want to know the problem is inside bofore I do.
Please help.