I was putting new points in today in my 72 luhrs, with a 318, I took off the contact plate to see if there was any corrosion on the advance mechanisim. I noticed that there was one thick heavy looking spring, and one thinner spring. Is this normal to have two thickness springs in there, i thought they have to be the same. I always thought the boat didn't go as fast as it could, could this be the cause? Otherwise it runs great probably going about 15-20 mph at open throttle is this normal on a 25' luhrs with a single 318? thanks. P.S the tach doesn't work so I dont know the rpm's at w.o.t.