stupid old people

Discussion in 'Motorized Bicycle General Discussion' started by crassius, Nov 23, 2016.

  1. crassius

    crassius Well-Known Member

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    Had about 1/2 hour today to wait for customer to come pick up repaired bike, so took one of the new bikes out to run in a bit. This one only has about 3 miles on it. Hopped on and rode till it started to slow up a bit, and as I was thinking; "I should have put more gas in it", it started to get REAL noisy too.

    Looked down & motor was jumping up & down & leaning left. After years of telling customers that they need to always check motor is tight before riding, I forgot it. Limped home slipping clutch & holding motor with my foot : (

    Tightened it up and all was good.

    These kits are called PK-BOOM in typical chinese naming fashion, but I'm really thinking the 'angry bumblebee' would be better as they really haul at WOT and sound great. may have to stock up on 36T sprockets as the low end torque should take it easily.
     
    #1 crassius, Nov 23, 2016
    Last edited: Nov 23, 2016
  2. Agreen

    Agreen Member

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  3. Amarion1

    Amarion1 Member

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    I repaired a bike for a guy at work. He came in late to work with a snapped chain so i put on a replacement and went to kick it over and the whole motor moved.. no wonder the chain snapped... didn't have time to take it apart and extract broken bolts so i wire tied it with heavy duty tie wire for him. Happened about a month ago and still holding tight ☺
     
  4. crassius

    crassius Well-Known Member

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    what bothers me most is that this was 2nd build of the new motors and the first one needed snugging up before each ride for about 6 or 7 rides - just totally spaced it
     
  5. Allen_Wrench

    Allen_Wrench Resident Mad Scientist

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    When I first got my current engine (Dax 2-stroke HT) back in 2010, I kinda thought I already knew everything I'd need to know about 2-strokes, having worked on them in the past. Got the engine installed, everything hooked up, put in a thicker "break in" premix, and tried like **** to get it running.
    Swapped out the stock killswitch for a toggle switch from Radio Shack. Got her running, she'd warm up, then die. [wash, rinse, repeat]. Kept checking every doggone thing, taking things apart, everything. Nothing was wrong. So I thought.
    Then, on one ride, I spotted what was happening. The screw holding the choke plate kept loosening up. Then it would gradually flop down and choke the engine. After tightening it repeatedly, and thoroughly, I finally put Loctite threadlock on it.
    Works great to this day. Engine still running strong, for almost seven years. Thanks Dax!
     
  6. MEASURE TWICE

    MEASURE TWICE Active Member

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    Don't know if this qualifies as stupid, but I put a magneto on backwards where it mounts to the engine. The magneto is practically symmetrical except that there is a place that the air-vane governor bracket clips and screws in place on one side only.

    I had removed the governor as it would have been difficult to have the mechanical mechanism go to the carburetor linkages when I used a 90 degree elbow manifold.

    I only just noticed as a similar Briggs engine has a label on each side of the magneto stating either faces toward cylinder or faces away from cylinder.

    Since the coil and laminations do not have any polarity, but it is only the magnet on the flywheel that has polarity, I never saw any problems.

    I thought if it really mattered any I would put it right. I did however realize that a while ago I had repaired a broken magnet wire going into the epoxy. Made the repair and soldered and RTV potted the wire, it would only fit backwards when mounting due to slightly larger form factor on one side after repair was made.

    Timing no affected either with the magneto on backward, but on a ignition with a high voltage coil and battery setup I read where it will still work, but not as well. I don't have any battery powered coil on this engine.
     
    #6 MEASURE TWICE, Nov 28, 2016
    Last edited: Nov 28, 2016
  7. Chaz

    Chaz Active Member

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    One time I was fiddling around with the engine and tried to start it back up but it wouldn't fire. I peddled for about ten minutes on and off taking a break since it was almost to the point of barfing when I finally noticed that I had disconnected the plug cap.

    :-||
     
  8. Allen_Wrench

    Allen_Wrench Resident Mad Scientist

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    Every now and then, they become "exercise bikes". :)
     

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