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1990 20hp evinrude problem

C

catangler

New member
Ok gentlemen, I'm stumped on this one I have a 20 horse rude that runs like a champ till I get to half throttle then it just bogs down badly. In the last two weeks i have replaced the fuel tank all the fuel fittings and hoses rebuilt fuel pump cleaned carb pretty good then and now put a carb kit in and there is no change wat so ever in the motor its a pull start fires up in 1 pull does a superb job till i get past half throttle. this is not the first time for me to do carbs (first outboard though) so i knows its clean in my eyes. I have not done a compression check yet nobody i know around here can do it and was wondering is there a way for me to do it wat do i need? if not is there any insight wat might be wrong I know of no boat mechanics in my area so im shadetreeing this project If anybody has any ideas plz shoot em at me
 
Ok gentlemen, I'm stumped on this one I have a 20 horse rude that runs like a champ
till I get to half throttle then it just bogs down badly. In the last two weeks i have replaced
the fuel tank all the fuel fittings and hoses rebuilt fuel pump cleaned carb pretty good then and now put a carb kit in
and there is no change wat so ever in the motor its a pull start fires up in 1 pull does a superb job till i get past half throttle
. this is not the first time for me to do carbs (first outboard though) so i knows its clean in my eyes.
I have not done a compression check yet nobody i know around here can do it and was wondering
is there a way for me to do it wat do i need? if not is there any insight wat might be wrong I know
of no boat mechanics in my area so im shadetreeing this project If anybody has any ideas plz shoot em at me
​
 
You need to start with the basics, compression and spark test. Most auto parts carry compression testers, and an air gap spark checker. The spark should jump a 7/16" gap and be bright blue. If those check out you most likely have a fuel delivery problem. Try pumping the primer bulb when it happens, if it picks up you have a fuel pump problem. When you cleaned your carb did you remove the high speed jet and clean it?
 
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