1977 35hp Johnson...Bogs down with throttle open

C

CGordin

Recruit
Joined
Jul 5, 2009
Messages
3
Trying to get the motor right before I continue with my 1976 13.5
Boston Whaler...I have a 1977 Johnson 35hp, with new water pump,
new fuel pump, and carb. rebuilt two days ago. Cranks and idols
very nicely...When you more throttle up the boat attempts to reach
plane but the engine surges up and down....runs fine when you pull
the throttle pack ??? Carb adjust ? Timing issue? i need some help
please....
 
A

azbassinjay

Cadet
Joined
Mar 10, 2009
Messages
21
Re: 1977 35hp Johnson...Bogs down with throttle open

It might be in the spark. I had similar issues when I throttled it would lose power. Replace your spark plugs and cables. If it is a fuel issue you should notice a difference when running it and you choke it, you should have a surge in power. If not then it is an electrical issue.
 
C

CGordin

Recruit
Joined
Jul 5, 2009
Messages
3
Re: 1977 35hp Johnson...Bogs down with throttle open

thanks to all...I will replace plugs and plug wires...carb. was just rebuilt last Saturday and it was very clean....and hose was replaced..but i am not sure if all hoses were done. The engine doesnt die...it surges up and down and the bow stays high and cannot level off..have also tried all motor angle positions.
I will ask at shop for alcohol resistant line...we bought the new ones at a hardward store.....but this was just Saturday...will write back in a few with the results...Many thnks to both of you.
 
G

grady white sailfish

Cadet
Joined
Jul 14, 2009
Messages
16
Re: 1977 35hp Johnson...Bogs down with throttle open

You May Have A Jetting Problem I Once Bought A Used Outboard And It Would Start Good But We Took It Out And It Ran Like Crap So We Took The Airbox Off And It Took Off. It Turned Out To Be A Jetting Problem Hope This Helps And Good Luck.
 
You must log in or register to reply here.
Top