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Post by natedoggaz on Apr 13, 2013 2:57:23 GMT -5
Hello,
I have a GY6 Jonway 150cc.
Installed new petcock, fuel lines, and spark plug tonight. I also drained the old gas and put in some new stuff.
I bought the scooter used and the guy said it sat a while... has about 2700 miles.
There is spark, but its not even trying to start. I even sprayed in some carb cleaner into the intake and tried to start but still nothing.
I have not yet cleaned out the carb, which I will probably do tomorrow. I also read that checking and adjusting the valves could help.
Anything else I should try? Could it be a vacuum hose? I wish I had a diagram of how the hoses are supposed to be connected. There is a black petcock next to my fuel petcock and has a small hose that is not connected and a long hose that is not connected.
Also has a charcoal filter that has 3 hoses coming in on top and 2 connections on the bottom, but nothing is connected to the bottom 2 connections.
Thanks!
ND
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Post by gatekeeper on Apr 13, 2013 4:46:58 GMT -5
Yes, take the carb apart and clean it. Also, replace the fuel filter.
Pictures of your vacuum hose setup would be helpful.
If you have spark and compression it should at least pop when you spray carb cleaner in the intake so I would check those valve gaps. .004 inches on the intake and ,005 inches on the exhaust.
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Post by jvanderwarf on Apr 13, 2013 10:01:18 GMT -5
If it wont fire with carb spray your spark ma be to weak ... Try a coil
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Post by alleyoop on Apr 13, 2013 10:14:44 GMT -5
Did you test for spark on the motor? Testing spark on the frame is no good you have to test for spark on the motor, It could be a bad ground from the frame to the motor. A good ground is from the frame to a bolt on the Valve cover. Also check to make sure the killswitch is on the run position. Even if your valves need adjusting if you squirt some gas directly down the intake it should attempt to fire.
Check all the VACUUM HOSES, make sure all are connected and not disconnected.
The canister with the two connectors on the bottom is fine, that sounds like the GAS TANK VENT EVAP system. You will find a hose coming from the tank, top small hose is a VACUUM hose and another hose probably going to the Air Filter or Tubing of the Air Filter.
Alleyoop
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Post by natedoggaz on Apr 14, 2013 2:17:50 GMT -5
...after nearly all day working on the scooter, still no luck...
I removed the carb and cleaned it all out pretty good. It really wasn't that bad in there.
I re-gapped the spark plug - and it definitely has spark. I even shocked myself on accident.
I also re-gapped the valves .04 intake and .05 exhaust.
Has a new petcock, fuel filter, and fuel lines like I mentioned earlier.
It does not even sputter after spraying carb cleaner directly into the carb on the air intake side at WOT.
I'm racking my brains over this - its either electrical or fuel related somehow??
I've drained the battery 3 times now trying to get it started. Its probably something really simple (hopefully) that I am overlooking...
Its not the kill switch either, it wont even turn over with the switch off..
Oh - one thing to mention is that I checked the compression by taking the plug out and putting my finger where the plug goes - it wanted to suck my finger into the engine.... Isn't it supposed to try and blow it out?
Thanks~!
Nathan
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Post by gatekeeper on Apr 14, 2013 3:19:25 GMT -5
Did you set the valves in inches or millimeters? The measurements I gave were in inches. .004 inches equals about .1 mm.
You said you set the valves to .04/.05. If that is in inches it is too loose. The valve won't open enough to let air through which might explain why your finger is being sucked into the plug hole on the down stroke.
If your feeler gauge reads in millimeters then set the valves to .1mm
If your feeler gauge reads in inches then set your valves to .004 inches.
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Post by teddy554 on Apr 14, 2013 9:06:42 GMT -5
I would do a compression check if you are spray fluid in it and it aint even close to starting rings and piston might be shoot
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Post by natedoggaz on Apr 14, 2013 12:44:14 GMT -5
Doh! I set the valves to .04/.05mm... (.0015/.002in) - too small gap I guess... will adjust today.
Not sure if this is a.cause for concern, but when I took the valve cover off yesterday, I found a very small metal shaving in the cover...
One more thing....not seeing any fuel on the plug...may be valve related?
Thanks!
ND
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Post by gatekeeper on Apr 14, 2013 13:35:04 GMT -5
Yes that is on the tight side. But if everything else is good it should at least pop when you spray carb cleaner or fuel in the intake.
Do you have an air filter installed?
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Post by scooternewby on Apr 14, 2013 13:40:03 GMT -5
I would get a proper compression tester. They're cheap. Until then, you can put just a little oil into the cylinder. If it fires, you probably have bad compression.
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Post by natedoggaz on Apr 15, 2013 1:52:14 GMT -5
OK - just reset the valve gaps to .004 and .005 in (.1mm / .12mm).
Still not firing though...URGH!
There is extra sounds coming out of the carb now - like it is burping when trying to turn over.
I put the air filter hose and air box back onto the carb too..
I tried spraying into the intake also - still nothing...
Took out the spark plug and felt for air pressure. It still wanted to suck my finger in, but it was much more forceful - tried blowing it out more forceful too...
....Not sure what else to try....
Off topic - I found a part (electrical) that is flat and has one connection on one end, it is also ribbed - not sure what that is for? I could not find anywhere to plug it in?
Any additional suggestions in helping me get this beast started would be much appreciated!
Thanks!
Nathan
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Post by gatekeeper on Apr 15, 2013 5:39:42 GMT -5
You need to get a compression test gauge and check your compression. Look for one with a 10mm adapter. When you check the compression, hold the throttle wide open as you are turning the engine over so that you are pulling in as much air as possible. Let us know what the highest reading is.
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Post by chihuahuas on Apr 15, 2013 9:06:20 GMT -5
Pull the muffler and try to start it. The muffler may be clogged. If it is the air can't get in because it can't get out.
Bet You a $ it starts.
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Post by gy6girl on Apr 15, 2013 11:33:30 GMT -5
From the way he talks, the compression seems fine.
If it's drawing in, compressing, sparking, and exhausting, and still not running, logic would point to the fact that what it's drawing in is not flammable. It could be that the air/fuel mixture is wrong.
Check around the manifold. Maybe it's leaking there and just drawing in mostly air.
Even though you are getting a spark, and it's strong enough to shock you, it still not be right.
I had a scooter that was hard to start after it was warm. It would start cold perfectly, but after running it for awhile, then killing it, and trying to restart it, it wouldn't. No matter what. I had to let it cool down to start it.
Like you I checked everything and everything seemed fine. I couldn't figure it out.
So I just started replacing things. The thing that I replaced that fixed the problem was a new coil and spark plug, and I had a spark to begin with.
So even if you have a spark, it still might not be enough of one.
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Post by gatekeeper on Apr 15, 2013 11:57:34 GMT -5
He replaced the sparkplug. Maybe the woodruff key is broken and the timing is off? Still needs to check compression. He is spraying carb cleaner and/or fuel into the intake and getting nothing, not even a pop. Even if the timing is off and getting spark it should at least pop.
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..BAD TO THE BONE..
