Hi mate, do you know this boat? Yep was used on lochlomand, engine required quite a bit of work tbh but it's very good now starts first time and runs perfectly no knocking or missfiring anymore! I've also done alot of work detailing (wetsanding then machine polishing) the boat (as i'm setting up my own car detailing business called icegleam) so now it shines like new, no more pink windscreen etc!
Here is a list of the work that i've done on the engine:
1 new piston and honed cylinder
1 second hand piston
top and bottom oil seals
skimmed cylinder heads and new gaskets
waterpump housing and new impeller (housing was assembled wrong, probs why it overheated)
also fixed the choke (wasn't fully closing)
Compressions: 3 152psi and 1 148psi
Used it for the first time on sunday, engine is perfect except i think it's too high or something as it seems to rev alot and ventilate a little, still running engine in obviously atm!