Lifan 200gy-Timing Issue

Brimandirtrider89 · 01-30-2015, 02:29 PM

Hello Everyone,
I have a 2007 Lifan 200gy with a major timing issue. Back in August I came back in from riding and the next day when I tried to start the bike I couldn't get it to start. (I was recently laid off so I have free time!!!)

Here is what I checked/replace so far:
-Ignition Coil (Replaced)
-Spark Plug (Replaced)
-CDI (Replaced)
-Ignition Safety Switch (Replaced)
-Carburetor (Replaced)
-Spark Plug Wire (Replaced)
-Check for compression (Good Compression)
-Check for good gas (Good Gas)
-Check for spark (Blue Spark)
-Mechanically check for TDC (Everything checks out)

The bike seems to want to start because its backfiring, I don't want I'm missing.

Here is the kicker. Back in July my magneto was failing so I replaced with one I got out of a donor engine (Had about 1000 miles on it). Drove it for a couple of weeks and now it doesn't want to start. Any suggestions. The magneto does not have elongated holes so there is no way to adjust the pick up coil.

Adjuster · 01-30-2015, 03:14 PM

New gas and strong spark? If you give it a little spray of starter fluid in the carb it kicks over? Keep in mind also the air filter must be installed for the bike to run. The carb requires the restricted air flow to operate correctly. If still wont run I would be suspicious of the new carb. I don't see how it could have jumped timing.

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Brimandirtrider89 · 01-30-2015, 03:43 PM

Yes brand new gas, I drained the old and put fresh 92 in. The spark is blue. When I spray starting fluid in the carb is back fires and shoots flames out.
I believe the Carb is good because there is semi burnt fuel coming out of the exhaust. It seems like it wants to start but it wont completely run.

Adjuster · 01-30-2015, 03:47 PM

Make sure you try it with the air cleaner installed. This has tricked up a lot of people.

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Mudflap · 01-30-2015, 04:58 PM

Have you checked the valve lash?

Brimandirtrider89 · 01-30-2015, 08:26 PM

@ Mudflap-Is the valve lash the clearance between the rocket arm and the valve itself.
Adjuster-Tonight I tried starting the engine with the air cleaner off and nothing.

Brimandirtrider89 · 01-30-2015, 08:28 PM

I meant air cleaner on @ adjuster

Weldangrind · 01-31-2015, 01:42 AM

I agree; check the valve lash. Yes, it's the distance between the rocker and valve tip.

SpudRider · 01-31-2015, 04:32 AM

Yes, if the valve clearances are too tight, the bike won't start.

Mudflap · 01-31-2015, 06:07 AM

Another possibility is a sheared flywheel key. Could have been caused by not getting the flywheel nut tight enough after replacing the stator.

Brimandirtrider89 · 01-31-2015, 02:33 PM

I will check the flywheel key. For Lifan's you don't have to remove the flywheel to remove the stator because the stator is actually mounted in the engine cover itself. Good call about the flywheel key I will be checking that out tonight.

Brimandirtrider89 · 01-31-2015, 02:35 PM

Valve clearances are also correct, I checked and rechecked the gap.

Brimandirtrider89 · 02-01-2015, 11:33 AM

If the flywheel key was sheared would I still be getting spark?

Weldangrind · 02-01-2015, 12:45 PM

Possibly, but at the wrong time.

Mudflap · 02-01-2015, 01:31 PM

If you have a strobe type timing light you can check ignition timing with no need to pull the flywheel to check the key.

01-30-2015, 02:29 PM	#1
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	Lifan 200gy-Timing Issue Hello Everyone, I have a 2007 Lifan 200gy with a major timing issue. Back in August I came back in from riding and the next day when I tried to start the bike I couldn't get it to start. (I was recently laid off so I have free time!!!) Here is what I checked/replace so far: -Ignition Coil (Replaced) -Spark Plug (Replaced) -CDI (Replaced) -Ignition Safety Switch (Replaced) -Carburetor (Replaced) -Spark Plug Wire (Replaced) -Check for compression (Good Compression) -Check for good gas (Good Gas) -Check for spark (Blue Spark) -Mechanically check for TDC (Everything checks out) The bike seems to want to start because its backfiring, I don't want I'm missing. Here is the kicker. Back in July my magneto was failing so I replaced with one I got out of a donor engine (Had about 1000 miles on it). Drove it for a couple of weeks and now it doesn't want to start. Any suggestions. The magneto does not have elongated holes so there is no way to adjust the pick up coil.
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01-31-2015, 01:42 AM	#8
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I agree; check the valve lash. Yes, it's the distance between the rocker and valve tip. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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01-31-2015, 04:32 AM	#9
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	Yes, if the valve clearances are too tight, the bike won't start. __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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02-01-2015, 12:45 PM	#14
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Possibly, but at the wrong time. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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01-30-2015, 03:14 PM	#2
Adjuster Join Date: Dec 2014 Location: Deerfield Beach FL Posts: 1,410	New gas and strong spark? If you give it a little spray of starter fluid in the carb it kicks over? Keep in mind also the air filter must be installed for the bike to run. The carb requires the restricted air flow to operate correctly. If still wont run I would be suspicious of the new carb. I don't see how it could have jumped timing. /
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01-30-2015, 03:43 PM	#3
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	Yes brand new gas, I drained the old and put fresh 92 in. The spark is blue. When I spray starting fluid in the carb is back fires and shoots flames out. I believe the Carb is good because there is semi burnt fuel coming out of the exhaust. It seems like it wants to start but it wont completely run.
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01-30-2015, 03:47 PM	#4
Adjuster Join Date: Dec 2014 Location: Deerfield Beach FL Posts: 1,410	Make sure you try it with the air cleaner installed. This has tricked up a lot of people. /
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01-30-2015, 04:58 PM	#5
Mudflap Join Date: Sep 2014 Posts: 1,870	Have you checked the valve lash?
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01-30-2015, 08:26 PM	#6
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	@ Mudflap-Is the valve lash the clearance between the rocket arm and the valve itself. Adjuster-Tonight I tried starting the engine with the air cleaner off and nothing.
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01-30-2015, 08:28 PM	#7
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	I meant air cleaner on @ adjuster
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01-31-2015, 06:07 AM	#10
Mudflap Join Date: Sep 2014 Posts: 1,870	Another possibility is a sheared flywheel key. Could have been caused by not getting the flywheel nut tight enough after replacing the stator.
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01-31-2015, 02:33 PM	#11
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	I will check the flywheel key. For Lifan's you don't have to remove the flywheel to remove the stator because the stator is actually mounted in the engine cover itself. Good call about the flywheel key I will be checking that out tonight.
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01-31-2015, 02:35 PM	#12
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	Valve clearances are also correct, I checked and rechecked the gap.
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02-01-2015, 11:33 AM	#13
Brimandirtrider89 Join Date: Jan 2015 Posts: 19	If the flywheel key was sheared would I still be getting spark?
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02-01-2015, 01:31 PM	#15
Mudflap Join Date: Sep 2014 Posts: 1,870	If you have a strobe type timing light you can check ignition timing with no need to pull the flywheel to check the key.
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