Gamefisher 7.5 won't accellerate

[redbird]

Recently bought this motor cheap, installed new pump impellor and rebuilt carb. Motor Starts easy, usually 1 pull and idles smooth, water pump has good flow. Took it out for the first time today and it doesn't want to "open up". I can unhook the gas line and run it and as the bowl is running out of gas it will accellerate like it should, until it gets ready to run out of gas it just kind of bogs down. I read about someone else having this problem but cannot find the post I read it on. Could this be a float issue, carb related or ignition problem. Thanks

 

[pcrg28328]

Re: Gamefisher 7.5 won't accellerate

1. is the vent on your tank open?
2. does it have a filter that could be stopped up?
3. as it is running and you are trying to give it fuel, using a spray bottle try to shoot a little fuel down the carb and see if the engine burns it and picks up speed
4. does it bog then try to catch up? Try adjusting the air mixture screw counter clockwise 1/4 turn each time to equalize your air to fuel ratio.

 

[mrcrabs]

Re: Gamefisher 7.5 won't accellerate

installed new pump impellor and rebuilt carb

what exactly did you do to the carb, complete rebuild or just needle seat and gasket? If you didn't do it all you should have.
sounds like it could be out of sync

Look at the timing cam and compare where it hits wide open to the throttle butterfly plate, check and make sure the fuel pump element in its correct orientation and your float level is set correctly

 

[redbird]

Re: Gamefisher 7.5 won't accellerate

Mrcrabs, Ordered new carb kit and installed everything except the needle and seat. Wasn't sure how to remove the old seat so left those as they were. Float/needle operated freely and shut's off the gas (primer bulb gets firm and no gas leaks anywhere from carb.) Tried to set new float (plastic) as close to old as possible. Not sure of what exact setting (level) should be. How is the fuel pump element supposed to be oriented? Vertical, horizontal or 45? Could you give more detail about the timing cam and the throttle butterfly plate?
PCRG 1. Vent on remote tank open, assume vent is working properly, 2.does not have a filter inline, 3. Will check at next opportunity 4. Motor never seems to open up even not under load, if I unhook the gas line and run it in gear (on the boat) about the time the fuel bowl starts to go empty it revs up and seems to run like it should. I thought the air/fuel mixture was only for the idle adjustment and there was no adjustment for WOT. Thanks for all the suggestions, will make a check list of what you all recommend and go thru it to try and get it right. Also the motor is an 84' if that matters. Thanks again

 

[mrcrabs]

Re: Gamefisher 7.5 won't accellerate

Vertical, horizontal or 45? Could you give more detail about the timing cam and the throttle butterfly plate?

The slot in the element goes at the 2 & 8 O'clock position, the timing cam and the throttle butterfly plate are a very important adjustment (flywheel off) and you need to follow the book (if you want your Eska to give its all)
you can find that information @ http://groups.yahoo.com/group/eskaoutboards/ in the files section

PS you use a #4 crochet hook to remove the old seat,... and I'm thinking that old seat and the float level could be your main problem (also the orentation of the needle clip, open end toward the choke), get the carb/engine manaul and you will find yourself in much better shape

 

[pcrg28328]

Re: Gamefisher 7.5 won't accellerate

if the air adjustment screw is off it could allow more air than fuel into the throat and then it starves when you call for it to accelerate. Had the same thing happen 1 time. turning the screw counter clockwise allows a higher fuel to air ration (make the mixture richer vice versa clockwise can make it leaner) so that it has something to burn. Just reread your post " as the bowl is running out of gas it will accellerate like it should". Sounds like when the fuel gets low enough it is allowing enough air in to burn correctly, maybe your mixture is already too rich. just a thought. take the cap off the tank just to rule it out.

 

[mrcrabs]

Re: Gamefisher 7.5 won't accellerate

some non outboard 2 cyles and 4 cycle carbs had a idle air screw but outboards have a idle fuel adjustment

if the air adjustment screw is off it could allow more air than fuel into the throat and then it starves when you call for it to accelerate.

from the manual

Carburetors on outboard applications use float type
which have a separate idle speed fuel pickup tube
pressed into the casting. The idle mixture screw is
located on the top of the carburetor near the engine.

Outboard carburetors have a built-in fuel pump consisting
of a fuel pump element which inflates and deflates
with crankcase pulses which opens and closes two
flap valves in the fuel pump, thereby pumping fuel
from a remote tank to the carburetor float bowl.
When replacing the fuel pump element, install with
the slot opening at a 45o angle as illustrated.

View attachment 109342

I guess its about the same process but the outboards which are loop charged and have emissions carbs, there idle screw richens the mixture by letting in more fuel @ idle and like all jets are controlled by the location of the butterfly except for the main jet in the bowel nut.

 

[Tommy Two Stroke]

Re: Gamefisher 7.5 won't accellerate

Make sure you change the float, as well as the needle and seat. The old brass Tecumseh floats are soldered together and are prone to corrosion, with gas ultimately leaking inside the float. It's possible you could have some gas in your float, causing issues with the mixture so that your engine won't spool up when you adjust the throttle. The newer style plastic Tecumseh floats are much better. Use an 11/64" drill bit to set the float height, laying it on its side, touching the carb body, near the outer (non pivot) end of the float, and adjusting the tab on the float so that the float just contacts the drill bit. As mrcrabs pointed out, the open end of the clip that holds the needle to the float needs to point toward the air intake side of the carb. Also, be sure the pinhole in the carb jet is clear, using a single strand of copper wire and pushing it through the hole - this is absolutely essential.

 

[pcrg28328]

Re: Gamefisher 7.5 won't accellerate

Did you get it fixed? What was the problem?