Can anyone please help me to solve my problem with my Honda BF90 encounter today?
Here is the sequence of events:
1. Just after casting off with engine running at approximately 2000rpm the overheat light and buzzer came on and rpm dropped.
2. Checked and confirmed that water is flowing from the water signal outlet.
3. Switched off engine and restarted after about 2 minutes.
4. Same thing happened as above.
5. Switched off engine and restarted after about 2 minutes.
6. Engine running OK at 2000rpm for about 5 minutes.
7. Increased rpm to 3000 and again after approx. 2 minutes the overheat light and buzzer came on and rpm dropped.
8. From the boat out at sea I phoned a friend and after explaining what happened he said that the thermostat might have got stuck closed so I opened the plastic thermostat cover, removed the thermostat and closed the cover.
9. Restarted the engine and since I was a bit convinced that the problem was the thermostat I ran the engine on 4000rpm.
10. Just after a couple of minutes same thing happened.
11. Switched off engine and headed for shore with my auxiliary engine.
12. Got the boat to the garage and as usual with engine running at idle ran fresh water through the engine to rinse it.
13. I never use the flush port to rinse the engine but I feed fresh water from the normal intakes near the propeller using ‘headphones’.
14. Switched off engine and opened the thermostat cover.
15. With fresh water running I switched on engine and just after a few seconds water was flowing from the thermostat port.
16. Switches off engine and am asking for some guidance.
Here is the sequence of events:
1. Just after casting off with engine running at approximately 2000rpm the overheat light and buzzer came on and rpm dropped.
2. Checked and confirmed that water is flowing from the water signal outlet.
3. Switched off engine and restarted after about 2 minutes.
4. Same thing happened as above.
5. Switched off engine and restarted after about 2 minutes.
6. Engine running OK at 2000rpm for about 5 minutes.
7. Increased rpm to 3000 and again after approx. 2 minutes the overheat light and buzzer came on and rpm dropped.
8. From the boat out at sea I phoned a friend and after explaining what happened he said that the thermostat might have got stuck closed so I opened the plastic thermostat cover, removed the thermostat and closed the cover.
9. Restarted the engine and since I was a bit convinced that the problem was the thermostat I ran the engine on 4000rpm.
10. Just after a couple of minutes same thing happened.
11. Switched off engine and headed for shore with my auxiliary engine.
12. Got the boat to the garage and as usual with engine running at idle ran fresh water through the engine to rinse it.
13. I never use the flush port to rinse the engine but I feed fresh water from the normal intakes near the propeller using ‘headphones’.
14. Switched off engine and opened the thermostat cover.
15. With fresh water running I switched on engine and just after a few seconds water was flowing from the thermostat port.
16. Switches off engine and am asking for some guidance.