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Basic engine tuning.

Discussion in 'Gas Engines' started by Terryscustom, May 6, 2015.

  1. acerc

    acerc 640cc Uber Pimp

    Sounds like it is to lean.
    Flyingjon likes this.
  2. Flyingjon

    Flyingjon 70cc twin V2

    We figured must be a vapor lock issue but didn't have much for ideas on curing it. Will check the fuel lines out.

    The crazy deal is, if you kill it, refuel it, and start it right away again, then it starts easier. I wonder if maybe a fuel line close to the muffler has more time to vaporize if it sits there a bit....?

    I did richen it up close to an 1/8 and that helped the issues of not throttling up smoothly, but didn't notice any difference in how it started.
    Phil.Griffin and thurmma like this.
  3. sparkx38

    sparkx38 50cc

    Very helpful info Terry. Just curious. Why is this method specific to the 100cc class engines? Do you have a different method for say the 60cc class and the 170cc class? My DA 170 is also running a tuned pipe which makes tuning even more different. Any help there? Thanks again for the 100cc class info. Will come in handy for my DLE 111.

    Sent from my XT1254 using Tapatalk
  4. Last week I had the same issue with my DA-50 about getting it started on a hot day after the first flight. I actually could see the bubble in my fuel line (which was no where near the exhaust). But it was 100 degrees sitting in the Arizona sun. So I don't blame it for not wanting to run again! So hot days, I get the plane into the shade right away to help out.
    thurmma and Flyingjon like this.
  5. Phil.Griffin

    Phil.Griffin 70cc twin V2

    I have this EXACT same thing going on. As long as I let my engines cool before restarting or, fuel and start immediately, they crank up fine. If they sit a few minutes after a flight I can forget them starting again until they cool off. In my totally uneducated opinion, if they sit too long, the carb gets heat soaked and will need to cool again below some certain temp before restarting. I've had others tell me their DA's will start regardless but mine will not.
    49dimes and Flyingjon like this.
  6. Flyingjon

    Flyingjon 70cc twin V2

    That same thought had crossed my mind that the carb is heating up and causing issues. Seems like there would be an easy cure other than setting a fan in front of the motor when you shut it down...
  7. Phil.Griffin

    Phil.Griffin 70cc twin V2

    I plan to try an EFI 120 at some point in the next 12 or so months. I'm anxiously awaiting the inevitable price drop, and the ability to send an existing engine in for the upgrade. I want to compare, in my own airframes, the new technology with the old.
    49dimes likes this.
  8. 49dimes

    49dimes Damn I'm hungry

    It's that time of year again:eek:. Hot Humid weather causing lean conditions :very_angry:. Just opening the L needle a tad usually solves the problem. Shade and cool down after a flight is a must for me. See.....my personal "onboard" pump needs it too :attaboy:.
  9. Terryscustom

    Terryscustom 640cc Uber Pimp

    I didn't say the info was specific to 100cc engines, just the needle settings that I talk about. You will find basic needle settings in your manual or from the mfg. of the engine.
    Tuning an engine is not rocket science, they all tune the same with the process I noted. Use the same thing for my 20cc all the way up to 180cc. If the tuning process is leaving you with issues either A - The process was deviated from or B - there is a problem with your engine or setup to start with.
  10. sparkx38

    sparkx38 50cc

    Misinterpreted what you was saying and couldn't figure out why it would make a difference. Makes much more sense now. Thanks

    Sent from my XT1254 using Tapatalk

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