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Thread: Loss of power

  1. #1
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    Loss of power

    Hi and thank you for taking time to read and possibly respond to our problem. We have an Animal engine that is built to WKA specs. It runs good up to about 2/3's of the throttle. When you open the throttle up it falls flat on it's face. When you back up about 1/3 off the throttle, it comes back to life. It doesn't shut the engine off. It's a Briggs & Stratton Animal Alcohol engine.

  2. #2
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    This is while the kart is on the stand or motor on dyno ? or on kart and while racing ?

  3. #3
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    Carb plugged up.
    Take the bowl off and remove the jets and inlet needle. Clean thoroughly with brake clean and reassemble.
    I'm betting that fixes you up.

    From now on, get in the habit of purging the fuel at the end of each night with a mixture of gas and Marvel Mystery Oil. Run the engine for couple minutes and you're good to go until next week.
    If you need complete instructions on how to purge the fuel, just ask and I'll add it to this post -- I'm sure I've posted it on these forums a time or two in the past.


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  4. #4
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    Is your butterfly going over center?

  5. #5
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    Butterfly on an WKA alcohol animal????

  6. #6
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    Quote Originally Posted by racing promotor View Post
    This is while the kart is on the stand or motor on dyno ? or on kart and while racing ?
    It only happens while racing. It revs up good and holds the rev wide open while on the stand.

  7. #7
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    It has a slide, not a butterfly. It is a walbro carb with a slide.

  8. #8
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    Thank you. We know how to purge the fuel. We will definitely try this and see if it makes a difference.

  9. #9
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    If you have already checked the float level and drop, inlet valve, tried new float, cleaned all jets and emulsion tube. Then replace the fuel lines and make sure it does not have any crimp right where it goes into the carb.
    That can sometimes be the problem. fuel lines will shrink, especially if you run gas through them to purge engine.
    If it is cutting out at wot then it is not getting enough fuel.

    Never rev an engine on the stand. Bad things happen!

  10. #10
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    Quote Originally Posted by Patti View Post
    It only happens while racing. It revs up good and holds the rev wide open while on the stand.
    Yikes!
    Well, at least the rod bolts have been adequately tested.

    Could be a simple float height or drop issue.
    Let us know what you find.

  11. #11
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    I've seen three different odd things cause this over the yrs and guy's pulled there hair out until they found the issue.
    One was because of being on a 15* mount it screwed with the float, changed to a lower mount never did it again.
    Another was the type of air filter being used, just had to switch to different style filter ( don't remember details for sure ) but I think he had to get off the floppy filter.
    Another was fuel tank fuel line came off the bottom I think it was when the tank was drilled the piece of plastic was still attached in a small area and acted like a flapper and would suck shut.

  12. #12
    4 Cycle Advanced User Jimbo's Avatar
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    There are lots of things that could cause this type of problem.
    The the fuel system could definitely be the problem but another cause could be that the Flywheel has slipped.
    Late ignition timing is a sure to cause a lack of performance and a lazy engine under load.
    Thank You to the 2017 206 Cup Grand National Champions for choosing Faster Motors
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  13. #13
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    Thank you to all! We appreciate all input.

  14. #14
    4 Cycle Advanced User Jimbo's Avatar
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    Are you capable of checking the float level and jet sizes?
    Hopefully, whoever built the carb engraved the sizes into the jets.
    Can you measure the float level for us?
    Make sure the float needle is not corroded or damaged.
    Is the float bowl corroded?
    Do you have an impact gun that you can take the flywheel not off and see if the keyway is lined up or close to it?
    Does it have a Blue PVL ignition coil?
    What spark plug does it have in it?
    Thank You to the 2017 206 Cup Grand National Champions for choosing Faster Motors
    Cayden Fretwell Sportsman Class Champion
    Emily DeMaster Junior Class Champion
    Grant Zimmermann Senior Heavy Class Champion
    Randy Raridon Masters Class Champion

  15. #15
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    We are not sure and will check as soon as we are able (probably over the weekend). Thank you and we will let you know.

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    Does anyone happen to know the timing degree for this engine (Briggs & Stratton Animal WKA specs alcohol engine)?

  17. #17
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    Quote Originally Posted by 01ron View Post
    Butterfly on an WKA alcohol animal????
    You gotta have a sense of humor.

    My cam card says 29 degrees on the ignition timing.

  18. #18
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    I'll bet there were many laughs on that one.

    But you have to give him credit, he was trying to help.

  19. #19
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    Quote Originally Posted by Patti View Post
    Does anyone happen to know the timing degree for this engine (Briggs & Stratton Animal WKA specs alcohol engine)?
    WKA does not have a spec for timing. You can use what ever you want.

    Steve

  20. #20
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    I find overextended (over rotated) butterflies all the time. I reset them on my SF-60 flow bench. Just not on WKA alcohol animal engines. That would be a new one on me!!!!!

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