old-gubbins
Petty Officer 3rd Class
- Joined
- Jul 3, 2006
- Messages
- 81
Engine reluctant to start, fires occasionally, but usually only on full throttle, revs 5 to 10 seconds then dies.
CDI unit was faulty, just installed a brand new one, cleaned carb (twice), new impeller, new head gasket (took head off to check cylinders before buying a new CDI unit!).
After being reluctant to start, it ran OK on full load on the boat for about 20 minutes after the new CDI unit installed, then symptoms returned.
Fuel pump pulses fuel when starter pulled. I have checked continuity on the wires to the charge coil and trigger coil whilst tweaking and pulling on the wires and they look OK.
To me, the symptoms seem like lean fuel supply, yet the (new) plugs (especially the lower one) look wet.
Any ideas, please, on what I am missing.
Why have I bothered spending "a fortune" on a new CDI unit: Because any 8hp 4 stroke (two cylinder) is about 22 lbs heavier, and the 6hp Tohatsu 4 stroke single cylinder engine which I have as a kicker for another boat vibrates so much more than the old DT8.
Any help appreciated, thanks. O.G.
CDI unit was faulty, just installed a brand new one, cleaned carb (twice), new impeller, new head gasket (took head off to check cylinders before buying a new CDI unit!).
After being reluctant to start, it ran OK on full load on the boat for about 20 minutes after the new CDI unit installed, then symptoms returned.
Fuel pump pulses fuel when starter pulled. I have checked continuity on the wires to the charge coil and trigger coil whilst tweaking and pulling on the wires and they look OK.
To me, the symptoms seem like lean fuel supply, yet the (new) plugs (especially the lower one) look wet.
Any ideas, please, on what I am missing.
Why have I bothered spending "a fortune" on a new CDI unit: Because any 8hp 4 stroke (two cylinder) is about 22 lbs heavier, and the 6hp Tohatsu 4 stroke single cylinder engine which I have as a kicker for another boat vibrates so much more than the old DT8.
Any help appreciated, thanks. O.G.