150 evinrude running 4400 wot

Benny1963

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Sep 17, 2006
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1,476
hi i have a 17ft mckeecraft evin 150 crossflow it has a ragged 21 pitch
stainless prop new power head carbs are opening all the way
no spark prob no highspeed jet prob got boat from brother in law.
it only turns up 4400 wot planes good runs 40 mph gps need to get to
max wot 5800 or so should i go with a 17 or 19 pitch also was going to buy a michigan match alum are they ok fpr light use .
thanks benny b
 

Dhadley

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Feb 4, 2001
Messages
16,978
Re: 150 evinrude running 4400 wot

A 21 might be a tad much for that boat but it shouldn't be 1400 rpm off. If you're sure the motor is running OK, we'll need to ask some possibly silly questions -- like, are you trimming the motor out or is still tucked in? With a 21 I'd think you'd be well into the 5000 range.
 

Benny1963

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Sep 17, 2006
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1,476
Re: 150 evinrude running 4400 wot

yea motor runs full out fresh carbs , i trimm up to about 4500 then it starts to hop , hull is slick foam is dry boat floats in 12in of water i need to run it without cowl and air silencer so i can see if it might be a linkage prob.
but linkage goes to the stop and butterflys are open all the way ,
sorry im confuseing my self here .
thanks mr hadely as usuall you are the man on the spot.
you work hard for no pay.
thank you, benny b
 

Benny1963

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Sep 17, 2006
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1,476
Re: 150 evinrude running 4400 wot

you no what i might have a tach prob it has jumped around a little
might need to check rec. and swap tach to see what the outher one does
thanks benny b .regarless the prop is shot the prop shop woulndt touch it
thanks benny b
 

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: 150 evinrude running 4400 wot

OK, the boat responds to trim. Now let's look at the motor. What year 150 is it? You mentioned a new powerhead, what did they set the timing at?

I know you said the high speed jets are clean - what about the carbs? Have they been cleaned? How long did it sit when your BIL had it?
 

Benny1963

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Sep 17, 2006
Messages
1,476
Re: 150 evinrude running 4400 wot

carbs were soaked and blown with new kits thermos waterpump
fuelpumps and the primer selinoid is new
will put in shop to have the timeing done and link and sink
but all was checked when carbs were done motor is 1981 150 crossflow sport
comp 125 120 120 125 120 120
will check tach and have mech check timeing and link again
thanks benny b
 
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