Weekend

[Matysiak]

Hi All,<br /><br />Just thought i woould give you some feedback on this weekend's boating.<br /><br />My Johnson 115 hp (1980)now runs really well, but i am only getting +- 5200 RPm at WOT and around 38 MPH . The boat is a 16tf run around. The prop is 17 pitch. <br /><br />The timing has been set at 28 degrees by the mechanic who eventually fixed the motor, would changing down to 24 degrees help/improve matters?<br /><br />Finally, one of the bolts fell out of the centre casing between the two banks (Just above the thermostat casing) of cyliners while travelling at WOT, it sounded like i lost one of the pistons, tapping very loudly. Why would one little hole cause such a loss of power/noise?<br /><br />Stephen

 

[Joe Reeves]

Re: Weekend

Maty.... If you're speaking of a bolt falling out of the large rectangular plate between the cylinder heads, that is a outer and inner exhaust baffle plate assy.... red hot exhaust in the inner area, and cooling water between the inner plate and the outer plate.<br /><br />There are many water passages in the vertical bolt center section of that plate. Having a bolt back out would, in all probability, allow water to escape into the exhaust area which would find its way into the exhaust ports, pistons, etc.