1965 33hp Evinrude High Speed Adjustment

[HBF4]

I just rebuilt this engine. The low speed adjustment works fine, but I can't get any<br />power out of the engine at the high end. I check the synchronization, that seems fine,<br />and the points are set to .020. The high speed needle valve has a rounded end, not needle<br />shaped. Is this normal? Any other ideas would be appreciated.

 

[fireman 757]

Re: 1965 33hp Evinrude High Speed Adjustment

If you can get it out remove it. If it is stuck make sure you soak it and try the next day. Try to blow it out good with air pressure and you may be able to get a small wire (such as the inside of a bread wrapper tie) through it. This has to be perfectly clean. Any small piece in there will make your engine dog.

 

[almost retired again]

Re: 1965 33hp Evinrude High Speed Adjustment

HBF4<br />The above post is good, but when you start to adjust the carburator open it up and adjust the high speed first, then the low speed as all of the low speed fuel must pass thru the high speed jet first anyway.

 

[alcan]

Re: 1965 33hp Evinrude High Speed Adjustment

Hi HBF4<br />Your high speed needle should have a rather fat bevel to it. Look closely, if it is rounded you may need to replace it. Check for correct float level. Check the main nozzel gasket in the bowl. Make sure it's in there and it's good. Make sure your needle packing is good (both needles) and the packing nuts are snug. When you adjust the high speed, you need to be at WOT. Don't try to lean it for all it's worth. Once you get it leaned out back off just a little.

 

[Joe Reeves]

Re: 1965 33hp Evinrude High Speed Adjustment

HBF4.... This info may be of some help.<br /><br />Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns. <br /><br />Setting the high and low needle valves properly: <br /><br />(High Speed) Start engine (it will run pretty rough), take up to full throttle. In segments of 1/8 turn, waiting for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting. <br /><br />(Low Speed) Slow the engine down to where it just stays running. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting. <br /><br />When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.