"Larry" wrote in message
news:R3Jjg.1021435$xm3.420552@attbi_s21...
Hi:

I bought a 19 foot seasprite boat last summer. It is a 1986. Last
summer

I noticed that "on occasion" that boat would seem to "thump" after putting
it in gear.

The initial "thump" when putting it in gear is normal. That is he dog clutch
engaging. So is this thump after that initial drive engagement thump? If
so, do it sound the same ?


If I stayed at low RPM while leaving the boat ramp, it would
"thump" every few seconds.

Then thats not U-joints - sounds like it may be coming in/out
of gear perhaps? Have you checked shifter cables etc ?
Also, might be that interupter switch thing that cuts out the
iginition when you go in/out of gear, and cross over to reverse.
Is this an Alpha drive? Or god forbid a Cobra drive ?