Jump to content

simon43

Advanced Members
  • Content count

    9,400
  • Joined

  • Last visited

Community Reputation

6,740 Excellent

About simon43

  • Rank
    Ancient Member #174
  • Birthday 06/16/1959

Profile Information

  • Location
    Naypyidaw

Previous Fields

  • Location
    Naypyidaw

Recent Profile Visitors

42,106 profile views
  1. simon43

    Help! Bike suddenly stopped....

    See one of my previous and recent posts. The pilot jet was completely blocked and uncleanable. I was able to find a new jet in a dusty Burmese shop! The bike still won't start, so I'll try a new spark plug. (The pilot jet blockage makes absolute sense - the bike was running fine at medium/high speeds ==> main jet. I slowed down at a corner and the bike spluttered to a stop ==> using the pilot jet at low speeds.)
  2. This!! You can be an adult and still have fun. I'm almost 60 years old and teach English at an international school in Myanmar. I teach from kinder up to secondary grades. Which grades do I prefer to teach? KG and lower primary grades, 1,000 times over! ? Because I can (I should!) sing, dance and generally act like a child in class, since the best way to learn a second language for the youngest students is to make the lessons fun, not boring. A person that I respect very much is the late Robin Williams, because as an adult, he still enjoyed 'being a kid'.... Life is too short to be an adult all the time.
  3. simon43

    Help! Bike suddenly stopped....

    See my previous posts - I already did this and yes, it fires for a second or so.
  4. simon43

    Help! Bike suddenly stopped....

    No vacuum activated fuel valve - the petrol gets to the carb float chamber just fine ?
  5. simon43

    Help! Bike suddenly stopped....

    OK, I just spent a few hours bouncing over the potholes on a motorbike taxi in the rural Burmese countryside... We finally found a dusty old bike accessory shop that looked straight out of a Dickens novel. The owner found a replacement pilot jet with (indeed!) a visible hole. So I've put the carb back together with the new pilot jet. The bike still won't start, but I guess this is maybe because there is no air/petrol mixture at all in the cylinder head/fuel intake of the engine. I'll recharge the battery and try to start the engine again later this evening.
  6. simon43

    Help! Bike suddenly stopped....

    Yes! .. and if the pilot jet were completely blocked??
  7. simon43

    Help! Bike suddenly stopped....

    OK, more checks done... I put my hand over the carb air intake and tuned over the engine - there is strong suction. I stripped down the carb. There are 2 jets, the large main jet (which is clear), and a smaller jet. But with that smaller jet, I'm not sure if it is meant to have a hole all the way through.. I can see a couple of minute holes on the body of the smaller screw thread (the part that is screwed into the carb body). but on the other side of this jet (with the large screw thread where you apply the screwdriver to unscrew this jet from the carb body, I cannot see a hole all the way through, (unlike the main jet). Should there be a hole going all the way through that small jet?? When the carb is in place, the carb tank chamber fills up fine. If I unscrew the chamber drain screw, then the petrol starts to drain out, indicating that fuel lines are all fine. The throttle cable and slider all work fine and don't stick. The choke control opens/closes the air intake valve fine. Since there is suction when the engine is turned over, and the jet is clear, the fuel must be sucked up into the cylinder intake, (unless my question above about the smaller jet is the problem). If the air/fuel mixture is being drawn into the cylinder, then it should ignite/backfire/whatever if it reaches the spark. With spark plug removed and turning the engine over, I can see mechanical up/down movement inside the cylinder. I'm open to more suggestions!! Update - I forgot to mention - I'm in Myanmar. Absolute lack of Honda dealers who know about this bike - they only deal with the scooter type of Honda bike. I'm thinking again about that pilot jet - surely it should have a tiny hole that is visible to the naked eye??
  8. simon43

    Help! Bike suddenly stopped....

    Right, let me check this...
  9. simon43

    Help! Bike suddenly stopped....

    Can you please explain this check a little more? Where do I place my hand etc?
  10. simon43

    Help! Bike suddenly stopped....

    The heater resistance indicates that it's not broken, but I can't detect 12 volts on the supply wire to the heater. I jumped 12 volts from the battery to the heater but it didn't chnage anything. I don't think lack of the heater will be the problem. But I'm 99% sure that it is a fuel starvation problem which suddenly occurred. What sort of carb failure could do this? The jets were all blown through and all looked good. There is another hose pipe that comes off near to the carb/cylinder head intake and then goes to some mechanical unit mounted near the petrol tank. No idea what that's for...
  11. simon43

    Help! Bike suddenly stopped....

    I Googled and found out that the electrical bit is the carb heater - not sure whether failure of this would effect starting or not....
  12. simon43

    Help! Bike suddenly stopped....

    OK, I am making some fault-finding progress ? FYI, this bike is an XR125L, made around 2002. I took out the spark plug, dribbled a thimbleful of neat petrol into the hole, put the plug back and tried to start the engine. This time, the petrol ignited for a second or two! That suggests to me that the spark and timing and mechanics are fine, and that indeed it is a petrol starvation problem. But how? The carb has been stripped and cleaned..... But what are the 2 electrical wires that are connected to this carb???? They are connected close to the interface of the carb and the cylinder head, (ie the opposite end of the carb from the air filter). Has this carb got some form of electronic valve that regulates the passing of the petrol/air mixture into the cylinder head? I'm trying to Google for this information right now. It would make absolute sense to me if there were an electronic valve whose fuse had blown.
  13. simon43

    Help! Bike suddenly stopped....

    Sorry - it's a Honda XL125 off-road bike, single cyclinger.
  14. simon43

    Help! Bike suddenly stopped....

    As an afterthought, even though I have turned the engine many times with the starter motor, the spark plug is not 'wet' with unignited fuel.... surely it should be wet if petrol were reaching it. Hmmm....
  15. simon43

    Help! Bike suddenly stopped....

    I'm still thinking about fuel starvation. Even if the timing had slipped, the presence of fuel and spark would cause some ignition or backfire from the engine. I'm getting spark and absolutely no ignition or backfire. The mechanic opened the carb, took out the jets, cleaned everything in petrol and rebuilt it. If I unscrew the drain screw at the bottom of the carb, then petrol comes out of the plastic drain tube. I can't see how the petrol/air mixture cannot be entering the cylinder head and being there when the spark is generated...
×