trouble w/ acceleration 1977 115hp rude

Joined
Sep 14, 2006
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done alot of searches on the forum for the problem i'm having.
my problem: idles fine, goes into gear fine, when i go to powerup it bogs down around 2000 rpms.

what i've done so far: done compression check (okay). spark on all 4 cyl (okay), trigger assembly moves freely, check all fuel line connections (all tight), recently did a decarb about 2 months ago and replaced plugs at that time, plugs look good when pulled showed some carbon and were wet.

i'm down to the prop. how do i tell if i have a spun hub? i pulled it off and doesn't show any sign of melting. when i had the prop rehubbed about six months ago i noticed the guy who rehubbed it he put a punch mark on the brass hub in line w/ a punch mark n the prop. it is now not lined up but it's only about a 1/4 inch off.

any other suggestions would be appreciated cus i hear the fish calling me!!!!
 

Walker

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Jun 15, 2002
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3,085
Re: trouble w/ acceleration 1977 115hp rude

A spun hub will not give the symptoms you describe. Fouled carburators will.
 
Joined
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Re: trouble w/ acceleration 1977 115hp rude

thanks walker, i'll take them off tomorrow and let you know what i find!!
 

tashasdaddy

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Nov 11, 2005
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51,019
Re: trouble w/ acceleration 1977 115hp rude

sounds like it's flooding out. carbs. if you have a manual check your link & sinc. could be the carbs and spark are not working together.
 
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Re: trouble w/ acceleration 1977 115hp rude

well i took my boat out thuis morning and only change was i put my old aluminum prop on and danged if my boat ran fine. i'm stumped!!!! if i had a spun hub on my ss prop wouldn't my rpms rev up?? anyhow i dropped my prop off at my prop guy and he's gonna check it out. your guess is as good as mine!!!
 

Walker

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Jun 15, 2002
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3,085
Re: trouble w/ acceleration 1977 115hp rude

chazamerica58 said:
if i had a spun hub on my ss prop wouldn't my rpms rev up?? anyhow i dropped my prop off at my prop guy and he's gonna check it out. your guess is as good as mine!!!

Yes, they would.
 

tashasdaddy

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Nov 11, 2005
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51,019
Re: trouble w/ acceleration 1977 115hp rude

maybe the gunk in the carb finally moved.
 
Joined
Sep 14, 2006
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Re: trouble w/ acceleration 1977 115hp rude

ordered carb rebuild kits last night. not taking any chances. i want my boat running good for crappie and bass season. thanks guys
 
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