[peterb]

On my 1978 23' SeaCraft SF I have twin 1998 Yamaha's. Supposedly (according to the last owner) they have about 600 hours.

I have taken out the boat twice over the past week for about hour long cruises. Both times when the engines were cold they took a number of cranks before they would cooperate. Once they were running they seemed fine.

High end speed is in a little more than 40 (at aroung 5200+ RPM's). Compression is very similar on both engines (127 to 140) on each engine.

I am thinking that a good decarb might help things out a little. On my prvious boat (which had a 175 HP 1997 Johnson Ocean Runner) I would shoot the decarb down the carb throats, as well as into each of the cylinders.

I have been doing a little research and have been coming across the following options.

1. Use Seafoam in a small gas tank (along with gas and oil)
2. Use Deep Creep like I used to use decarb on my old Johnson (no jokes please!)
3. Use Ring Free
4. Use the old decarb treatment.


I would appreciate any insights that my highly esteemed fellow ClassSeaCraft members may have.

Thanks