fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 8, 2019 7:48:13 GMT -5
Hi guys. Got a SYM Jet EuroX 50. I'm trying to make it run but it won't. Checked the compression - about 6/7bars (100 psi). Checked the spark - there is.
Well, there is compression and spark. After putting some fuel to the cylinder, nothing happen. It doesn't even smoke. The spark plug is wet - fuel line is ok, carb cleaned 2 times already. Try with and without exhaust - nothing. Checked the flywheel and stator. The crankcase spline is ok, the stator too i think. Scoot has DC CDI so i checked pick-up coil - 100 Ohms, it's ok. Gap between flywheel and pick-up coil - seems to be ok, but I will make it closer soon.
What's your suggestions about it? What can be a problem there?
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Jul 8, 2019 9:20:40 GMT -5
How long it was standing?
Mostly oil drips slowly down into the crank case when they sit for very long time.. Let it start with a hooked up battery for a minute without plug (plug must be on spark plug cable anyways due to resistance oc coil, might be damaged if not) and see what comes out the spark plug hole.
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 8, 2019 9:49:16 GMT -5
I already took off top end. The cylinder and head. Check piston, piston rings, pin and bearing.
Nothing that could make this engine not running.
It was running like 2/3 weeks ago. Then it stand without cylinder and now I put everything together.
I think there isn't oil in case, rather fuel (gas mixed with 2Stroke oil) as spark plug is wet.
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Post by tortoise2 on Jul 8, 2019 9:56:45 GMT -5
What can be a problem there?
Timing? Insert a probe into spark plug hole, position piston at top-dead-center, then observe if flywheel T-mark is aligned with case indicator. Sometimes the flywheel-crankshaft woodruff key shears which throws off spark timing. While the carb was off for cleaning, did you also inspect the reeds? |
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 8, 2019 10:04:04 GMT -5
Reed valve was ok when I install it, but I will re-check it. I check pick-up, stator, flywheel and key on the crankshaft - everything seems ok. Also flywheel is exacly at T. Not sure about spark timing as I haven't timing lamp.
I measure voltage from pick-up - 0.2VAC and 107 Ohms -seems to be ok.
Maybe spark is too weak to fire mixture under pressure. |
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Jul 9, 2019 7:22:46 GMT -5
I already took off top end. The cylinder and head. Check piston, piston rings, pin and bearing. Nothing that could make this engine not running. It was running like 2/3 weeks ago. Then it stand without cylinder and now I put everything together. I think there isn't oil in case, rather fuel (gas mixed with 2Stroke oil) as spark plug is wet. Please also check what I said. Typical struggle on these engines... |
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 9, 2019 8:13:53 GMT -5
Will check it for a while.
You mean run via electric starter to make sure the case is empty?
Can I have vaccum line from the cylinder doen't connected?
I disassemble fuel pump.
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Jul 9, 2019 8:46:12 GMT -5
You wont built up pressure if you take off that hose. At least put a screw in the hose to seal it.
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 9, 2019 9:21:40 GMT -5
Scoot finally give some signs of life. Spark is constantly wet but it was running for 1 second.
Is it carb fault that spark plug is wet?
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Post by pinkscoot on Jul 9, 2019 11:43:12 GMT -5
Did you seal up the vacuum hose that was mentioned a few posts back? 2T's really need a well sealed system, any leaks will cause them to not start or run badly.
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 9, 2019 12:55:55 GMT -5
Yes, I did. After that, it was running for second and not anymore.
Spark plug was wet so make it dry with a heatgun and gave hot spark plug into cylinder and nothing again.
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Post by geoffh on Jul 9, 2019 15:25:26 GMT -5
So it,s not dead :)but if you have taken the engine apart you need to check your work"cleaning the carb " is not a quick spray and a wipe you need to check every hole and channel is clear.Also make sure the air box is connected and sealed before you try to start it.over on the left is a directory use this to find the no start solver.Keep in touch.
Geoff
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 11, 2019 16:24:59 GMT -5
The scoot is running. Won't move when I got mixture screw at 1,5 turns. When screwed on to the max it start to move.
ATM scoot is smoking a lot. I will mount airbox, kickstart and stuff I have been disassemblied.
Is smoking fault of lack of airbox, bad carb setting or leakings?
What's your thoughts?
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Post by repherence2 on Jul 11, 2019 19:54:58 GMT -5
The scoot is running. Won't move when I got mixture screw at 1,5 turns. When screwed on to the max it start to move. ATM scoot is smoking a lot. I will mount airbox, kickstart and stuff I have been disassemblied. Is smoking fault of lack of airbox, bad carb setting or leakings? What's your thoughts? all that smoke is caused by leak-by of 2 stroke oil from the injection pump. the oil leaks by and ends up at the bottom of the crankcase. it happens when a 2 stroke scoot with oil injection pump sird for a while. lupo76 mentioned that earlier. |
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fdvd
Scoot Junior
Posts: 8
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Post by fdvd on Jul 12, 2019 2:46:38 GMT -5
I run it with mixed fuel instead of clean gas.
I leave pump oil and all hoses from it not connected.
I seal vaccum hose from fuel pump, and I don't even use fuel pump at that time.
Will check if I make correct mixed fuel and check there isn't any leaking air.
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