omc jet sizes

[powerabout]

Well a little update on my 3 Cylinder.....I figured out that the jets should be bigger for the carbs Im using , So I went from 50's and 32's to 52s and 34's, and the motor performed perfectly ......But after riding it around at 4000 RPM for a while I went up to 5000 Rpm and is wanted to run hot....The pee tube has a full stream but it definitely ran hot. This is the year model that required the cooling updates, which I have done. I moved the pee tube to the top of the block and replaced the thermostat and bypass spring that the update from OMC specified. Im thinking the thermostat didn't open or I have a blockage is the water passage ? Will it cool properly if I remove the thermostat and leave the bypass and spring in it?

How did you determine to ran hot?

[87vantage]

I have a digital gauge with the sender screwed into the threaded boss in the top of the head, i watched the temp climb to 190 and as I slowed down it actually stuck....I never tried too restart it. Just got it back on the trailer, checked the compression , they are all still at 120 and I removed the head to inspect everything and it was all good...

[phillnjack]

you need to either update exhaust cover or take out the rib in your old one..
yes it does make a big difference.
notice on the newer exhuast cover pate there is NO rib where i point the red line to..
simply grind that out and its then the same as the newer updated one..

[Murray55]

Does anyone know what angle the taper is cut through the jets at? Ex. 4° off centerline.