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Post by scooter37 on Jun 25, 2011 9:30:02 GMT -5
I am new here.great forum by the way.I have scoot with a 1e40qmb engine.I have fuel and spark.this thing will not fire.what in the world am i missing here.any suggestions would be greatly appreciated.
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Post by stepthrutuner on Jun 25, 2011 10:08:35 GMT -5
Compression is the final ingredient. Will it blow your finger off the sparkplug hole smartly when the engine is cranked over?
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Post by scooter37 on Jun 25, 2011 11:53:06 GMT -5
just checked compression 90 pounds
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Post by marshinman on Jun 25, 2011 12:24:08 GMT -5
Reg, maybe the gas is not making it to the cylinder. Try placing your hand of the opening of the carb while turning it over and see if it tries to start then.
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Post by scooter37 on Jun 25, 2011 12:31:06 GMT -5
UPDATE:got it to start holding the throttle wide open.runs poorly. and alot of gas/oil coming out of the exhaust..tryed adjusting the air/fuel mixture.at about 1 1/2 turns out right now ,but tried adjusting it in and out from there.also took the reed valves out and inspected them, they look fine.
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Post by stepthrutuner on Jun 25, 2011 12:47:46 GMT -5
Possible fuel level too high in bowl or admittance valve bypassing (trash in it).
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Post by scooter37 on Jun 25, 2011 13:04:39 GMT -5
I have had the carb off and thoroughly cleaned it.
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tango
Scoot Enthusiast
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Post by tango on Jun 28, 2011 22:57:42 GMT -5
It sounds like you might be flooding. Check your pet-cock to see if it's closing properly. The rubber diaphragm in them can get stiff and lazy and will not close when the vacuum from the engine stops. As it sits for a period of time it allows fuel to run into the carb. Soon that fuel ends up in your cylinder. This happened to me recently while working on a 150cc 4T. Here's how you check to see if it's working correctly:
Unplug the fuel line and the vacuum line. If fuel is running continuously from the fuel line blow into the vacuum line. The fuel should stop running. Stop blowing in the vacuum line and instead, suck on it (don't worry, there should be no fuel flowing into your mouth, but if there is, that means that your diaphragm is broken and it needs to be replaced). If sucking on it causes the fuel to flow, fine. But if when you stop sucking fuel continues to flow, your pet-cock is toast.
Good luck.
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Post by stepthrutuner on Jun 29, 2011 6:35:46 GMT -5
If you suck too hard you will ruin your vacuum release valve. Most people eliminate them to deny that part causing trouble in the future.
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tango
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Post by tango on Jun 29, 2011 11:13:27 GMT -5
I've noticed that quite a few people eliminate them and I suppsoe that's a good idea because you never know when those silly little things will fail. Obviously though the downside of using a manual petcock is that the likes of me WILL forget to shut them off!
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Post by 2strokd on Jun 29, 2011 11:44:59 GMT -5
It sounds like you might be flooding. Check your pet-cock to see if it's closing properly. The rubber diaphragm in them can get stiff and lazy and will not close when the vacuum from the engine stops. As it sits for a period of time it allows fuel to run into the carb. Soon that fuel ends up in your cylinder. This happened to me recently while working on a 150cc 4T. Here's how you check to see if it's working correctly: Unplug the fuel line and the vacuum line. If fuel is running continuously from the fuel line blow into the vacuum line. The fuel should stop running. Stop blowing in the vacuum line and instead, suck on it (don't worry, there should be no fuel flowing into your mouth, but if there is, that means that your diaphragm is broken and it needs to be replaced). If sucking on it causes the fuel to flow, fine. But if when you stop sucking fuel continues to flow, your pet-cock is toast. Good luck. In that case your float wouldnt be adjusted proper.... Or the seat is bad, or the tip on your needle. Constant fuel flow or not, the needle and seat in the carb, as well as float height have the final say in that.
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tango
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Post by tango on Jun 29, 2011 19:13:09 GMT -5
I thought about that as well and I am actually set to disassemble the carb on the 150 this coming Sunday to have a deeper look and a cleanup of it. I went ahead and mentioned the situation because we all know just how similar in (low) quality these Chinese scoots can be and this 2T here may also have bad internals in the carb too, brought on by contaminants or bad manufacture. It's worth a check either way, right? Can't hurt, I'm thinking. As a side note, I really do understand and appreciate the difference in quality between Chinese and Taiwanese scooters. My Yamaha was built in Taiwan and has been WAAAAYYYY more reliable than all three of my neighbour's Chinese motors. The brand new Futong didn't even last a week before it broke down 3 times! The breakdowns were caused by a dirty carb and a failed regulator.
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Post by jmkjr72 on Jun 29, 2011 19:41:38 GMT -5
more often then not the probelm with a manual petcock is people forgeting to turn them on i did it one time with my stella im thinging wtf i have a full tank of gas look down to make sure the choke is off and i see the fuel valve faceing the wrong way
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Post by scooter37 on Jul 2, 2011 19:22:42 GMT -5
I can get it running now.its pumping way to much fuel to it,I have adjuted on the needle in the throttle barrel.checked the auto enrich(seems to be working propperly when hooked straight to 12v).you hold it wide open it bogs and smokes then for a few seconds it seems to lean out and run like its supposed to then back to bog.wont idle either.
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Post by stepthrutuner on Jul 2, 2011 19:51:38 GMT -5
If your carb has a drain you can push some clear hose onto the nipple, and zip tie it alongside the carb running upward. With the drain screw open you can visually see the fuel level of the bowl in the hose. A 4 or 5 inch piece should be about right. Run the scoot at different throttle settings while on the centerstand and observe fuel level. It should remain constant. When cleaning be sure to remove all jets and spray out all air passages. A lot of people will run a fine wire or fishing line through the passages to assure they are clear. The wire from a bread twist tie should do.
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