FiBerOpTiK
Cadet
- Joined
- May 26, 2017
- Messages
- 24
Hi guys I am having some trouble and hoping someone can help me out. I recently acquired a used 1990 40HP Evinrude VRO and mounted it to my boat. VRO has been disabled and I am running premix. Took it out for the first time and it ran OK. It would want to stall when idling and I also noticed it had some hesitation at WOT. I also noticed that when pumping the primer ball it would never really get completely hard and fuel would start running out the throat of the bottom carb into the airbox.
I kind of figured I had an issue with the needle and seat so I purchased 2 carb kits and rebuilt both as well as replaced the fuel filter. After rebuilding the carbs and reinstalling them the motor would fire up, but didn't want to stay running unless I hit the electric choke every few seconds. I tore the carbs back off and double checked all the orifices as it sounded like I was not getting enough fuel since it would run with the extra fuel from the electric choke. Reinstalled carbs again with the same issue where it wouldnt idle well. However after the rebuild the carb is no longer leaking fuel and the bulb will get hard so I think that issue is resolved.
I pulled the plate off the throttle cable adjustment and screwed it quite a ways out bringing the idle up and it would idle that way pretty well. I also played around with the slow speed idle adjustments on both carbs. Before rebuilding it I made sure to note the position they were in by counting how many turns until seated, which was 3 1/4 on both. Played around with those and never could really get it perfect. It did idle, but pretty high RPM and my arrows on my linkage were off after that.
I decided to take it out anyway just to test. Again, would stall when trying to put into gear, but if you pulled the high idle lever up some it would idle fine until you had to push it down to shift into gear again. Also when going WOT it acted like I was only giving it like 1/2 throttle for some reason, couldnt even get the boat to plane. I am assuming that is because I adjusted the throttle cable so far.
Do any of you guys have any suggestions on what I should try?
The only things I can think of are the carbs are still not adjusted correctly. I didnt mess with anything other than the slow speed jets, which I set back to what they were and also the rod that connects the two carbs together. I am not exactly sure how those were set when I took them apart.
The only other thing is the VRO fuel pump. I was thinking about swapping it with a normal pump.
I kind of figured I had an issue with the needle and seat so I purchased 2 carb kits and rebuilt both as well as replaced the fuel filter. After rebuilding the carbs and reinstalling them the motor would fire up, but didn't want to stay running unless I hit the electric choke every few seconds. I tore the carbs back off and double checked all the orifices as it sounded like I was not getting enough fuel since it would run with the extra fuel from the electric choke. Reinstalled carbs again with the same issue where it wouldnt idle well. However after the rebuild the carb is no longer leaking fuel and the bulb will get hard so I think that issue is resolved.
I pulled the plate off the throttle cable adjustment and screwed it quite a ways out bringing the idle up and it would idle that way pretty well. I also played around with the slow speed idle adjustments on both carbs. Before rebuilding it I made sure to note the position they were in by counting how many turns until seated, which was 3 1/4 on both. Played around with those and never could really get it perfect. It did idle, but pretty high RPM and my arrows on my linkage were off after that.
I decided to take it out anyway just to test. Again, would stall when trying to put into gear, but if you pulled the high idle lever up some it would idle fine until you had to push it down to shift into gear again. Also when going WOT it acted like I was only giving it like 1/2 throttle for some reason, couldnt even get the boat to plane. I am assuming that is because I adjusted the throttle cable so far.
Do any of you guys have any suggestions on what I should try?
The only things I can think of are the carbs are still not adjusted correctly. I didnt mess with anything other than the slow speed jets, which I set back to what they were and also the rod that connects the two carbs together. I am not exactly sure how those were set when I took them apart.
The only other thing is the VRO fuel pump. I was thinking about swapping it with a normal pump.