Throttle Fully Open but no speed..??

Kaptain Kimster

Recruit
Joined
Sep 30, 2009
Messages
3
Hello and thank you.

We have a 1990 - 60 HP Johnson; J60TLESM. (With very few hours on it.)
Just a little backgroud:
The engine came off a 26' boat and we put it on a 15'. It ran great with no alterations about 10 afternoons on the water, although we knew it needed a new prop and throttle cables to fit our boat. Then we added new throttle cables because the old ones weren't working, and ran it great about 4 more afternoons (without the new prop). Then the trouble set in...

The Problem:
The engine sounds great - throttle opens up on the engine when you push the throttle handle forward...but it will not go fast anymore, only a fast idle (about 5 mph). We have since replaced the prop with the correct pitch, changed all the spark plugs, checked for stripped gears, broken pins and cleaned the carbs, new fuel lines and tank - even added the ether preventor - All looks GREAT - like new. Like I said - the engine sounds great - fires off great - humming sweet like it should - is great for a fast idle ride down the river... just won't give us the speed anymore?? And we need to pull a tube! :eek:) This just has to be something simple... staring us in the face... we just don't know what.....

PLEASE HELP - MUCH THANKS for any ideas.
The frustrated - :confused:
Kaptain Kimster
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: Throttle Fully Open but no speed..??

Does the carb linkage actually go to wide open ? I would recheck the cable end connections to make sure one did not come loose.
 

bktheking

Vice Admiral
Joined
Jul 29, 2008
Messages
5,057
Re: Throttle Fully Open but no speed..??

Sounds like you aren't firing on all cylinders, have you checked for spark across the board?
 

mikesea

Lieutenant Commander
Joined
Oct 1, 2006
Messages
1,830
Re: Throttle Fully Open but no speed..??

check the timing plate connector on top of the throttle arm,Id bet you knocked it off or broke it during cable job,therefore your getting carb but no timing
 

Kaptain Kimster

Recruit
Joined
Sep 30, 2009
Messages
3
Re: Throttle Fully Open but no speed..??

- Yes - we have checked the cables - multiple times... :eek:)

- Yes we checked across the board... And we have changed the spark plugs...

MikeSea - Wiil do! Thank you :eek:) I'll keep you posted...
 
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