Two stroke engine problem

Discussion in 'Help with all other issues' started by sib8292, Jun 26, 2018.

  1. sib8292

    sib8292 Well-Known Member Club Sponsor

    my elderly strummer has been super reliable but recently it's developed an annoying habit of stalling when hot . Usually it restarts on first attempt but sometimes it refuses to fire. Once cool again no problems.

    Fresh fuel and fuel treatment has been tried, plug changed but no cure.

    Any ideas?
     
  2. sib8292

    sib8292 Well-Known Member Club Sponsor

    For strummer reads trimmer!!
     
  3. Me!

    Me! Utterly retired Club Sponsor

    Fuel supply pipe collapsing with heat ? Bit like Me actually.
     
  4. Centaur

    Centaur Site Pedant Club Sponsor

    Can only be one of two things. Spark or fuel. Have a spare plug handy and next time it acts up and refuses to restart them whip the plug lead off and stick it on the spare plug. Hold the spare plug against the cylinder head and see if there is a good healthy spark on pulling the cord. May need four hands but why else do we get married? :p We then know which bit to investigate.
     
  5. DEG5Y

    DEG5Y Been there, and had one Club Sponsor

    Make sure the Mrs holds the spark plug while you do the pulling. :)
     
    • Great stuff ! Great stuff ! x 1
  6. Quiney

    Quiney Been there, and had one Club Sponsor

    There are a couple of small rubber diaphrams in the carbs and they perish over time. I took mine to a local mower fixer guy, who knew instantly what the problem was. Collected a couple of days later and it was better than new after his fix and tune-up.
     
  7. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    Possibly stating the obvious - these things normally have a pretty useless foam air filter.....have you cleaned it?
     
  8. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    Thinking about this further, I had a slightly similar issue on a scarifier. After much head scratching it turned out that the vent tube on the fuel tank was kinked, presumably causing a vacuum to build up in the tank while it was running and eventually starving the carb of fuel.

    Not totally sure is above was what actually happened, but inking the vent sorted it!!
     
  9. sib8292

    sib8292 Well-Known Member Club Sponsor

    Thanks all

    I haven't changed the plug, but have checked the spark when it's happened before and it's healthy enough. I cleaned the air filter too. One other clue is that it usually but not always starts hunting before it finally dies. So that does seem to point toward fuelling as the issue. I dare say it's a rubber item that has perished either a fuel line or an internal carb diaphragm as suggested. I shall have to find time to take it apart.
     
  10. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    Try running it without the fuel tank cap done up fully - if there is a vacuum forming in the fuel system that might get round it. There may be a tiny pin hole vent in the cap - if there is give it a clean out.
     
  11. sib8292

    sib8292 Well-Known Member Club Sponsor

    Andy thanks for that and I had tried that, but it made no difference. It does seem to point to fuel starvation when hot though doesn't it. I suspect I shan't get to it till winter time and in meantime it gives me an excuse to have a break from strimming after 20 mins or so!
    Roll on retirement - when I will have time on my hands. Reached agreement with my firm today that I will retire at end of April next year, by when I shall be well on the way to my 67th birthday - doesn't seem right saying that, I had to stop to think it through!
     
    • Cool Cool x 1
  12. Jaws

    Jaws Corporal CockUp Staff Member

    Def fuel starvation so something in the delivery system
     
  13. sib8292

    sib8292 Well-Known Member Club Sponsor

    Just to give you all a final update. Gave up and got local garden machinery chap to sort. He too diagnosed fuelling issue, stripped and cleaned carb - all sorted! Thanks everyone.
     
    • Great stuff ! Great stuff ! x 1
  14. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    I bet he charged more for the same prognosis that you got on here!!

    Glad you are sorted.....:hsughwiggle:
     
  15. sib8292

    sib8292 Well-Known Member Club Sponsor

    This is true Andy though his charge was not just diagnosis but fixing the problem, and at £50 inc VAT I'm reasonably happy, especially since he said it's generally in good condition. Not bad for a strimmer I bought in about 1984!
     
    • Like Like x 1
  16. Cougar377

    Cougar377 Express elevator to hell Club Sponsor

    Thought this was about a stink wheel problem. :BangHead:
     

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