50 hp force no speed

[ronaldmilligan]

i have a long shaft motor on a short shaft boat i have adjusted the mounting but cannot get any speed out of it any ideas.

 

[ronaldmilligan]

i have a long shaft motor on a short shaft boat i have adjusted the mounting but cannot get any speed out of it any ideas.
I have checked the prop all is good not spun. is there a gear in the lower end that could cause this issue.

 

[roscoe]

Hard to make a good diagnosis without more info.

How big is your boat?
How heavy?
What hp is it rated for?
Is engine running on both cylinders?
Does the engine rev up?
If you have a tach, how high is it reading?
How fast is the boat going?
What is the prop pitch?

 

[racerone]

Running on 1 cylinder I think.

 

[Nordin]

Yes maybe running on one cylinder.
Do a drop down test in neutral at idle.
If running on one cylinder it will stop when you pull the HT boot at the bad cylinder.

 

[jerryjerry05]

Yea!!! all the above and do a compression and spark test!!
Post the results.

 

[racerone]

????-----It will stop when you pull the HT boot off the good cylinder !

 

[jerryjerry05]

They will actually run fairly good on one cyl.
My neighbor had a 15hp Mercury, complained it didn't run as good as it should.
Took the cover off and found the bottom spark plug lead laying in the bottom of the cowl.
He said he'd checked everything and couldn't find anything.
Held the boat for 3 days and charged him 50$ and rehooked the plug wire.

 

[Nordin]

Of course racerone you are right, my brain must have had some miss match when I typed it down !!!!!!!!!
Sorry.

 

[topgun3690]

Of course racerone you are right, my brain must have had some miss match when I typed it down !!!!!!!!!
Sorry.

I knew what you meant! Figured you had a momentary SBF.....Swedish brain fart....