I have a 1990 Force 90 H/P L drive that will not go past 3k rpm under way and will not plane out. Comp check is good, fuel pump is cleen. Prop is correct. Please help<br />Thanks Ron
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
Is this boat new to you?<br />Have you ever got it to plane?<br />Is this a new problem?<br /><br />Check for spark on all 3 plugs.<br />Fuel to all 3carbs?<br />Do the plugs all look the same? with a slightly oily/sooty appearance?<br />Or is one of them very oily, or very dry?<br /><br />Some Force powerheads will fit as a replacement, but I don't know which one(s).
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
check the grounds to the could packs, check and make sure the trigger is connected correctly<br />when i had that problem thats how i fixed it those two things.
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
The boat is new to me, I got it hot when the water pump went.I replaced the pump, head gaskets, and exhaust gaskets. Have no idea if it ran ok before. never got it to plane.<br />How do u check for fuel at csrbs?<br />Any help would be appricated<br /><br />
Originally posted by roscoe:<br /> Is this boat new to you?<br />Have you ever got it to plane?<br />Is this a new problem?<br /><br />Check for spark on all 3 plugs.<br />Fuel to all 3carbs?<br />Do the plugs all look the same? with a slightly oily/sooty appearance?<br />Or is one of them very oily, or very dry?<br /><br />Some Force powerheads will fit as a replacement, but I don't know which one(s).
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
hold ur hand over the open end of the carp, or hold the choke shut by hand, gas should drio out of the carb when let go if it doesnt start. make sure all grounds are hooked up and all coild wires are correct.
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
Fuel pump only puts out a couple # of pressure. (2-4 #)<br />Only way I've checked for fuel pressure is to remove line going to carbs and hold it in a cup. Then crank the engine over and watch to see if gas comes out the line.
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
There is also the possibility of the prop being the wrong pitch for the engine. I have a 90hp and the prop supplied with the engine was a<br />3 blade/21 pitch. This prop would allow only 4000 rpm, not the 5000 to which the engine should rev. Changing to a 4 blade/17 pitch gives me a max of 5000rpm and the ability to quickly reach planning speed.
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
The prop on this is a 13 1/2 X 19 pitch. Does this sound right? The boat is a 90 h/p L drive and is 17.5 ft.<br /><br /><br />
Originally posted by cyberman59:<br /> There is also the possibility of the prop being the wrong pitch for the engine. I have a 90hp and the prop supplied with the engine was a<br />3 blade/21 pitch. This prop would allow only 4000 rpm, not the 5000 to which the engine should rev. Changing to a 4 blade/17 pitch gives me a max of 5000rpm and the ability to quickly reach planning speed.
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
I am going to try that this weekend if out of time then what? Jeeze I feel dumb. <br /><br /><br />
Originally posted by Boater Dude:<br /> yes, damaged reeds can cause the engine to not perform at peak, i suggest a timing light, just to elmiminate it, autozone rents them.
Re: 90 hp Force L drive will not rev up past 3,000 rpm under load
how do u tell what prop is right for my 90 hp? <br /><br /><br />
Originally posted by rongentersr:<br /> The prop on this is a 13 1/2 X 19 pitch. Does this sound right? The boat is a 90 h/p L drive and is 17.5 ft.<br /><br /><br />
Originally posted by cyberman59:<br /> There is also the possibility of the prop being the wrong pitch for the engine. I have a 90hp and the prop supplied with the engine was a<br />3 blade/21 pitch. This prop would allow only 4000 rpm, not the 5000 to which the engine should rev. Changing to a 4 blade/17 pitch gives me a max of 5000rpm and the ability to quickly reach planning speed.
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