I have a 66 Evinrude with the Hot Water Choke carb. The motor will start and run quite reliably and motor around the lake fine at low RPM. After a local shop fixed a stripped plug port with a helio coil, I only thought some tuning was needed. So I tried the carb tune up and throttle cam adjustments from the excellent posts by J. Reeves and the moderator here on iboats. No matter what adjustment, the thing still dies out as I move the throttle toward advance. Yesterday I could watch the throttle Roller, and as soon as it lifted off the Cam a 1/2 inch or so, the RMPs would start to fade and die. I'm not sure what the choke position should be during tune up. I find the best running at automatic or Off. But still always it drops out on advancing the RPMs. Also I notice the choke assembly was not tightened and was wobbly when the motor was running. I opened it by removing the disc that says "lean" with a arrow. in there, the spring that connects to the (choke?) plunger looked like a rig job. Anyway I tightened the assembly to the carb and still had the same problem. Then the belt broke and my troubleshooting had to stop. Any ideas for a debug starting point on the RPM issue? I will try to find a new belt and continue searching for a solution.
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Fixed high speed jet orfice plug in the bottom of the carburetor is partially clogged.
EDIT: Most people put the choke on "automatic" to cold-start, then flip it to "choke off" to run once it warms up a bit.
Okay, thanks for the tips. I finally got the belt from crowley marine online. However it is the wrong size! My fault I should have checked the dimensions closer. Anyone know a good source for belts?
Anyway, looked at the manual and actual high speed port which brings up another question. When I removed the plug on the h.s.p. I was surprised that the high speed nozzle wasn't visible to me. barely 2 drops of fuel came out when I removed the plug. The manual says you should use a suitable high speed nozzle removal tool. Based on the pictures, isn't that just a flat head screw driver? I didn't have a flat head that small with me today, but felt around with a long hex key. Probing around with the hex key produced a few more drops of fuel and a little bit of gunk/dirt. If the nozzle is even in there, its deep in the cavity. Is this normal? Also it didn't feel like it had a slotted end for easy removal with a flat head. What type of operation can you expect if the nozzle is missing?
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66 Evinrude can't hit higher RPMs, Lark VIII
Linear Mode
