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Post by stancejontland on Feb 9, 2018 21:11:01 GMT -5
whats up guys just got my new exhaust put on.. got it to start up and run for a few seconds maybe 30 seconds at best. and cuts out. was dealing with this before new pipe. trying to mess with tune but nothing seems to be working. tried straight fuel to carb. tried from the diaphragm. seems like im not getting fuel because ill prime the carb by sucking and pushing air through vacuum line and it will start but when it dies out i pull fuel line off its dry again.. anything i should try? i have a brand new filter and diaphragm. new plug as well.
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Post by 'O'Verse on Feb 9, 2018 22:15:13 GMT -5
Current status.... Gravity fed? Vacuum fed? Is your carb pulling fuel from the tank sufficiently? And have you checked your reeds lately? How old is your petcock? And last but not least what kind of air filter?
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Post by stancejontland on Feb 9, 2018 23:10:45 GMT -5
i guess it gravity fed. and it is vacuum too? lol uhh it has a diaphragm like fuel line goes in goes out other side and vacuum in the middle connected to carb. i dont have a said petcock just the diaphragm. and i haven't checked my reeds yet but had previous posts about changing them because of some issues and couple of the guys said they sound like they are alright. and my air filter is a box with the foam filter.
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Post by 'O'Verse on Feb 9, 2018 23:34:58 GMT -5
Can we get a pic of your diaphragm. Hard to just diagnose from here. Sounds like your describing a petcock. With a diaphragm inside. Petcocks go bad after time. If your lines dry. You either have a block, a suction problem or both. You can try covering your intake hole on your filter (not completely) that will increase suction of gas from the tank by the carb. You could also up your gas line size. If you haven't already. Swap out your gas line with clear or colored clear gas line. That way you can see that there's gas in the line.
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Post by ryan_ott on Feb 9, 2018 23:48:18 GMT -5
How is the vacuum line condition? If you pull the fuel line off the carb, place in a container, suck on the vacuum line and pinch it off you should have constant fuel flow.
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Post by stancejontland on Feb 10, 2018 15:29:31 GMT -5
so suck on the vacuum line till fuel flows then pinch off vacuum line?
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Post by ryan_ott on Feb 10, 2018 15:41:13 GMT -5
That’s to verify that your fuel valve is working properly, given your vacuum line isn’t cracked.
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Post by stancejontland on Feb 10, 2018 16:01:01 GMT -5
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Post by stancejontland on Feb 10, 2018 16:28:56 GMT -5
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Post by oldgeek on Feb 10, 2018 16:48:10 GMT -5
How is the vacuum line condition? If you pull the fuel line off the carb, place in a container, suck on the vacuum line and pinch it off you should have constant fuel flow. Good video, you next check should be done just as described above. if you do not get a constant flow of gas as you suck on the diaphragm line from the petcock, that is at least part of your problem. IMO the starter turns over the engine easily, almost too easily. You may consider checking the compression at some point.
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Post by ryan_ott on Feb 10, 2018 16:52:58 GMT -5
If you get good fuel flow then move on to a functioning choke, carb float isn’t stuck and as mentioned check compression.
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Post by stancejontland on Feb 10, 2018 17:21:53 GMT -5
What do you mean functioning Choke? I always thought my bike ran better with the choke unplugged. And so i should suck on vacuum line and if it flows consistently what's my next move?
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Post by stancejontland on Feb 10, 2018 18:07:55 GMT -5
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Post by 'O'Verse on Feb 10, 2018 20:48:57 GMT -5
Thanks for taking the time to make us some videos. You mentioned you unplugged your enricher. Those carbs are finicky to say the least. Your enricher or electric choke is gonna help you get your scoot started. Looks like you have fuel flowing. Next check for spark. Pull the plug. Make sure your plug is gapped properly. And try to ground the plug on something metal like your frame while your trying to start it. Make sure you see a nice big blue spark between plug and frame. Once you see that you'll have two of the three causes narrowed down. As old geek stated earlier you'll need to check for compression. You'll need a compression tester. But I'm guessing it's your carb.
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Post by ryan_ott on Feb 10, 2018 21:09:40 GMT -5
If you have a drain screw on your carb bowl you could check there that your getting fuel into the carb. I’ve seen carb floats swell and get stuck up (no fuel).
On a side note I see in your videos you don’t have the cylinder cooling shrouds on. They are part of the cooling system. If you haven’t been using them I’d go right to a compression test. 2¢
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