no power @ full throttle

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william68

Recruit
Joined
Jul 23, 2007
Messages
2
Hi everyone,
i am new here but i think this is a great site.

1961 Johnson 40 hp model RDS-23
24:1 fuel oil mix

I have a problem with my Johnson motor, starts fine, idles fine the problem starts when i open it up full it runs like i am at half throttle for a few minutes then it will open up but there are times it will not open up. :(

Bill
 
X

Xcusme

Commander
Joined
Apr 21, 2003
Messages
2,888
Re: no power @ full throttle

Welcome to iboats!

You might be running on only one cylinder. Run motor on lake or test tank. Pull one plug wire (use insulated pliers). Does motor rpm change? If rpm's change, that plug is hitting. Replace that plug wire. Do this test with the other plug wire too. If either removed plug wire has no affect on motor rpm's , thats the dead cylinder. Pull flywheel and inspect coils for any cracks, replace them if they do. It would be a good idea to get some compression readings too
 
tashasdaddy

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: no power @ full throttle

check your compression and spark, also make sure the linkage under the flywheel and carb are moving freely, and not getting caught on something. i had that problem, on my 35, it ended up being the neutral stop (lever that goes up under the flywheel) was not moving completely out of the way to advance the timing plate.
 
W

william68

Recruit
Joined
Jul 23, 2007
Messages
2
Re: no power @ full throttle

thanks guys,
i will try your suggestion when i get up to the cottage this weekend.



Bill
 
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