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Old 21 August 2005, 05:20   #11
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,775
There is a flywheel sensor which sends the timing info. back to the ECU and it's prone to dirt and/or moving very. very slightly which can cause all maner of problems, including starting and running. I would check and clean this, although i would imagine (a) the DDT would highlight this and (b) an optimax trained mechanic would know about this but it's worth a look.

From memory (boat in marina) it's located on the port side of the engine near the top of the bug air-whotsit.

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Old 21 August 2005, 10:09   #12
Country: Greece
Town: Gloucetsreshire
Boat name: GATO DI MARE
Make: MAR.CO
Length: 9m +
Engine: Yamaha 200Vmax
MMSI: 235027678
Join Date: Sep 2002
Posts: 3,339
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................. and Richard saw the light

Seriously good info for Falcon though

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Old 21 August 2005, 14:27   #13
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
The DDT is pretty good at picking up sensor failures. Dont think thats going to be the problem. Low batteries or alternator problems will show up on your tacho when your running the engine or when you start it. Check the fuel and air pressures.
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Old 21 August 2005, 19:56   #14
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Not a clue on the opti but have seen similar problems on various other engines - caused by air leaking into the plenum chamber - also could be a dirty air valve pot. Don't even know if optis are setup like this but if they are worth a look. Sometimes things like this could be as simple as a small hole in a rubber bellows etc.

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