I have had a good look on the forum but can't find an answer to the problems I am having.
I recently changed the outboard on my boat to an Evinrude 110 V4 VRO 1987 and the main problem that I am experiencing with the new engine is a lack of low-mid range power to push the boat up onto the plane, although the engine idles fine. When you throttle on the outboard will sit at about 2200rpm labouring and can be a little smoky, pumping the fuel primer and varying the amount of throttle has no effect. I can get the boat up on the plane by getting any passengers to move to the front of the boat (the anti ventilation plate is level with the bottom of the boat). Once up on the plane and the engine is above 3000rpm it seems to perform well and will push the boat up to 40+ mph.
The first thing I did was buy a Clymer manual and have cleaned a load of glue like gunk from the main and idle jets in the carbs, replaced the plugs and leads and had a go at syncing up the timing (not sure how good a job I made of this) but the problem persists. I also did a compression test, I don't have figures as the needle on my tester is damaged, although all cylinders produced very similar results.
The other strange problem I have had is that after a minute or so the oil warning buzzer will sound. If I then pump the fuel primer the buzzer will stop, then after another minute or so start again. I have tried a fuel can with a pipe directly into the engine (to ensure it wasn't a problem with the fuel tank or lines) but the same problem occurs, at idle or high rpm!?!
I also thought I had a problem with the regulator/rectifier as the battery wasn't charging. I did the tests which pointed to the problem being with the reg but the battery has since started charging again. Another related problem is that the tacho works intermittantly, sometimes it will drop to zero sometimes it will go to the stop in the other direction (and I don't mean when I stop the engine and rev it up, for any jokers out there ).
The outboard currently has a 17" ali prop on it, I have also purchased a 19" and 21" prop from Ebay that I am waiting to try on the boat.
The boat is currently at my local chandlers but I am not confident he will be able to fix the problem as he is more of a Mercury/Mariner specialist than an Evinrude one. Also he has had it for 2 weeks and hasn't even looked at it yet.
Any suggestions will be greatfully received.
Sorry for the long post, but wanted to put as much detail in as I could.