We are not new to boating, but new to outboards.2 yrs ago we purchased a boat with a pair of 1999 S225 OX66 Yamaha's. Up 'till <br />now, I've been plodding along fat-dumb-and-happy changing this stuff every season:<br />- Water Sep Filters<br />- Engine fuel filters<br />- Spark Plugs<br />- Water Pumps and lower unit oil<br />- Cleaning O2 sensors<br />So, after reading up in this forum to get a plan to fix the one outboard that has a hot start problem, I have discovered that there are more "routine" repairs/tests I should have performing. Here is my plan of attack this year above-and-beyond what I have been doing --- <br />your experience and comments welcome:<br /> <br />- Low pressure fuel pumps/3 per engine<br />- Fuel Pump Gasket <br />- VST Pump Filter/1 per engine<br />- Float Chamber Gaskets <br />- Test O2 sensors after cleaning - need to search for recommended method to test,method in the service book ng?<br />- Check the plug resistor caps and coils - "Plug wire /resistor should be approx 750-850. The coil w/out the resistor cap should be approx 350."<br />- Verify oil pump lever adjustment<br />- Per the service manual, a throttle plate syncro adj is called for <br /><br />I think this covers it...... any other ideas or comments, advice? The hot starting problem: Starts fine cold, engine fires but stalls when <br />hot, starting with throttle advanced works and idle is normal <br />afterwords.
<br /> the maint schedule is also in the 2005 yamaha marine technical guide. another good reading book.