25 hp bogs down when giving gas..

hello everyone. im having a problem with my 88 yamaha 25hp outboard. when giving it gas after in gear the motor bogs down after a quarter of the way on the throttle. it doesnt stall out or nothing but just will not open up and go over 10mph.. here is a list of everything i have done, but the problem is still there. replaced the old metal gas can with a brand new plastic one that has the vent screw opened up on the gas cap. new fuel hose with new fuel connector clips on both ends (used same primer bulb because it was replaced three seasons ago.) new inline fuel filter and unscrewed the fuel cup and blew out the plastic screen filter that sits inside.. took carbs off and had my buddy who is a auto mechanic clean them both out and adjust air screws back to the settings that the manual called for. and the last thing i did was replaced plugs with the correct gap... one thing i did do when it was boging down was squeezed the primer bulb a couple times .. the bulb stayed hard every time i squeezed it and the motor didnt run any better or any worse. just wondering what else i should try... thanks.....

Re: 25 hp bogs down when giving gas..

Never hurts to check compression to make sure cylinders are sealing properly
Check timing to make sure it is advancing properly

Since you did not post a model # I do not know if that old motor has oil level or over temp alarm and safe mode that could be coming in and causing it to not run over 2K. If it does check to see if the alarm works properly

Re: 25 hp bogs down when giving gas..

99yam40 said:

Never hurts to check compression to make sure cylinders are sealing properly
Check timing to make sure it is advancing properly

Since you did not post a model # I do not know if that old motor has oil level or over temp alarm and safe mode that could be coming in and causing it to not run over 2K. If it does check to see if the alarm works properly

Click to expand...

yes it does have the little light that comes on if it runs hot or is low on oil. ill read into my service manual to see how this alarm works.. thanks

Re: 25 hp bogs down when giving gas..

Did they have any water damage to the bowls? Did you lynk and synk the carbs when reinstalling?