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Thread: engine miss honda fourtrax

  1. #1
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    Default engine miss honda fourtrax

    I have a 1993 honda fourtrax 300. It idles great but dies under a load, it acts like it is starving for fuel. I cleaned the carb and started it with the air cleaner off so I could see if the piston in the carb flutters up and done or stays steady at a higher rpm. It stayed steady which indicates the diaphram is ok, but I noticed an occasional misfire in the carb. Any suggestions as to what the problem is. THis has been driving my buddy and I up a wall.
    Thanks

  2. #2

    Wink

    Did you check the little tiny fuel strainer/filter/sediment bowl on the fuel selector switch? It unscrews and has an o-ring seal. It should be cleaned a couple times a year. Next, put a new spark plug in it, even if you can't see a problem. Those plugs break down. If you want the best plug, Go with the Denso-Irridium Spark Plug.
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  3. #3
    Member atvalaska's Avatar
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    choke on them stick...there a plunger type... if it sat for a while it will cruste up clean it....boots on carb cracked/hole in 1/2 off? set the valves .006 ...thats a bigge...i just sold one of these this past spring and know them well...
    WHEN IN DOUBT> THROTTLE OUT.......

  4. #4
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    I sprayed the carb with starting fluid while it was running and the rpms did not change so I think fuel lines and carb. are not cracked. I also used a gas tank off of a lawn mower and it acted the same. Valves are set at .oo6.

  5. #5

    Wink

    Try taking the plug out of the exhaust pipe, last four inches and it is on the bottom of the pipe. Sometimes they fill with water and form a restriction.

    Also, put a new spark plug in it.
    "96% of all Internet Quotes are suspect and the remaining 4% are fiction."
    ~~Abraham Lincoln~~

  6. #6
    Moderator AKmud's Avatar
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    Could simply be a weak spark... Make sure your coil is putting out enough juice. I'm not sure how to actually "check" the output, but maybe try swapping it with a known good one.
    AKmud
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  7. #7
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    what is the proper way to set the valves? when the mark shows it is on tdc do I set both valves or just 1 then rotate 180 and set the other one?

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