Lower carb on 1975 Evinrude 75HP

[dan o]

I have a 1975 Envinrude 75HP, that is<br />starved for gas on the lower cylinder.<br />(no power, spark fine) pulled bottom wire off<br />plug, no rpm change, and sprayed gas in lower carb<br />intake and rpm's increased)<br />Compression is just over 120....<br />So, pretty sure its the carb.<br />I notice the screw on the top of<br />lower carb, above the air intake was loose,<br />but tightening had no effect. Anyways,<br />other than taking the carbs off and cleaning,<br />is there anything else to check first?<br /><br />I saw another post, where it was inferred that the<br />lower carb could be in fault before others?<br /><br />Thanks,<br />Dan

 

[DJ]

Re: Lower carb on 1975 Evinrude 75HP

dan-o,<br /><br />Any fuel left in the lines is going to puddle in or at the bottom carb. The engine will die before all this fuel is completely burned out.<br /><br />Thus, the bottom carb. is more prone to fuel deposits, gumming, etc.

 

[ad4par1]

Re: Lower carb on 1975 Evinrude 75HP

Yup, djohns19 has it right. I recommend pulling the carbs and giving them a good cleaning. It wouldn't hurt to rebuild them if they haven't been done in a while. The needle/seat wear out and may require replacement. The screw above the intake that you refer to is the idle/low speed needle and should not have been loose. Rebuld kits ($15-20) will have the plastic retainers that hold the needles in place after adjustment. Do you have a manual? If not, I recommend getting one...it will help you along the way and show you how to adjust the idle/carbs/throttle/timing, etc.<br /><br />Let us know how you get on.

 

[dan o]

Re: Lower carb on 1975 Evinrude 75HP

Hey guys,<br /><br />Thanks for the replies...<br />I thought that may be the case....<br />Will get a manual....I hate reading directions...etc<br />but sometimes you just have to do it....<br />Will be better than putting a barbecue together...lol<br /><br />Dan