Lifan GY-5 Major Engine Malfunction w/ pics (grenade) - Page 2

SpudRider · 09-18-2011, 12:52 PM

I might be wrong, but I think he broke the connecting rod when he dropped the engine while removing it from the frame.

Spud

wilserchinarider · 09-18-2011, 04:16 PM

Spud, damage during removal highly unlikely, the motor was hastily and gracefully lowered...the neglected still connected choke cable served as a nice tether to keep the engine from falling on my toe. My "shop manual" never mentioned removal of the choke cable. :wink:

A little tricky removing the choke cable w/ an engine hangin on it I tell ya!

I did look at a donor bike this afternoon...

http://jerseyshore.craigslist.org/mcy/2579265613.html

Funny how they always put the pretty side in the ad. Bike was a non runner w/ the harness all messed near the case by the front sprocket. Also, it didn't appear to have similar plugs for the two engine wire looms?

I passed, as it is also a 19" / 16" wheel size w/ not too many crossover parts to the Lifan GY5. It was a 163FML fwiw.

FastDoc · 09-18-2011, 05:12 PM

I've NEVER seen a con rod break midshaft like that.

I think this MUST have been a manufacturing defect.

SpudRider · 09-18-2011, 10:20 PM

Quote:

Originally Posted by FastDoc

I've NEVER seen a con rod break midshaft like that.

I think this MUST have been a manufacturing defect.

Indeed! 8O When WCR mentioned he dropped the engine, I assumed he broke the connecting rod at that time.

I couldn't imagine the engine would break the connecting rod, unless it were very defective! 8O

Spud

SpudRider · 09-18-2011, 10:24 PM

Quote:

Originally Posted by wilserchinarider

Spud, damage during removal highly unlikely, the motor was hastily and gracefully lowered...the neglected still connected choke cable served as a nice tether to keep the engine from falling on my toe. My "shop manual" never mentioned removal of the choke cable. :wink:...

Egads! 8O I agree with FastDoc; that connecting rod was defective from the factory. :evil:

Spud

wilserchinarider · 09-20-2011, 08:25 PM

A donor was located this afternoon. It's a BMX Powersports w/ a large tag that reads manufactured by Shineray. The bike is beat up a bit but doesnt appear to have had much use. I might have overpaid at $300, but Im over a barrel so to say. The motor is a 169fml. I've read some mixed reviews on the short stroke motors....a touch more power / higher redline up top but a tad less torque down low??? We shall see.

Awaiting the transplant...

Thanks for all the help and advice guys!

FastDoc · 09-20-2011, 09:29 PM

Looks like a great deal to me!

You'll have a ton of spare parts to use, share or sell as you see fit.

I'd check the valves BEFORE you install it. Much easier.

SpudRider · 09-20-2011, 10:08 PM

Quote:

Originally Posted by FastDoc

Looks like a great deal to me!

You'll have a ton of spare parts to use, share or sell as you see fit.

I'd check the valves BEFORE you install it. Much easier.

X2 on all points.

Spud

katoranger · 09-20-2011, 10:19 PM

Looks like a good deal. That is a good workhorse engine. I think you will be happy with it.

MICRider · 09-20-2011, 10:24 PM

I think a running bike for $300 is a great deal! Hoping the transplant goes smooth as silk for you

Weldangrind · 09-21-2011, 01:37 AM

I agree, great deal. You'll benefit from those spare parts.

X3 on setting the valves now. Much easier.

wilserchinarider · 09-21-2011, 08:16 AM

Thanks for the valve adjustment advice! Popped the valve cover off last night and the valves were very tight! I could not percieve any slack in the rockers at all and couldn't get the thin .002" to pass! The valve cover inside appears a darkish / stained like dark brown oil. The cover off my existing engine is squeeky clean silver aluminum color on the inside.

Might this motor have been pushing exhaust gas out a valve that wasn't completely shut and burnt a valve? I did loosen up the valves and the motor appears to have a little better "pop" on the compression cycle w/ my thumb over the spark hole. Hah real technical. The donor motor was hard starting, would idle for 5 seconds, stall and restart and would eventually only idle for a minute or so untill it would take throttle. I did run the bike around in first gear and it appeared to run "normal".

At this point I think I will set the valves and install the motor and see how it runs. I think I could use the top end from my failed motor, but I don't think i will take the head off the donor...sound reasonable?

Thanks guys!

gloud · 09-21-2011, 09:37 AM

If it where me (and I did just do this with my possible donor motor for my XL175) I would pull the head while you have it out. to clean the valves you will need a valve spring compressor. (sears or Ebay) but it only take an hour or less to pop it off and clean it all up. (you will need new gaskets)

Or just mount it up and throw some seafoam in the gas to clean the valves.
(sounds more like an option for you. )

Where are you located if you are east coast us I would be happy to help. (I am in mass.)

Weldangrind · 09-21-2011, 10:06 AM

Since the motor is easy to install, I'd run it as is with properly set valves and good gas. Get it nice and hot and change the oil and enjoy it. I bet it will last a long time.

If it smokes, I'd pull the head back off and lap the valves and change the valve stem seals.

Yes, you would lose compression out of both valves if they're too tight.

FastDoc · 09-21-2011, 11:43 AM

I'd do nothing more than set the valves install the motor ride and enjoy.

09-18-2011, 12:52 PM	#16
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	I might be wrong, but I think he broke the connecting rod when he dropped the engine while removing it from the frame. Spud __________________ 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
	0

09-18-2011, 05:12 PM	#18
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	I've NEVER seen a con rod break midshaft like that. I think this MUST have been a manufacturing defect. __________________ Happy to serve.
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09-20-2011, 09:29 PM	#22
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	Looks like a great deal to me! You'll have a ton of spare parts to use, share or sell as you see fit. I'd check the valves BEFORE you install it. Much easier. __________________ Happy to serve.
	0

09-21-2011, 01:37 AM	#26
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I agree, great deal. You'll benefit from those spare parts. X3 on setting the valves now. Much easier. __________________ 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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09-21-2011, 10:06 AM	#29
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Since the motor is easy to install, I'd run it as is with properly set valves and good gas. Get it nice and hot and change the oil and enjoy it. I bet it will last a long time. If it smokes, I'd pull the head back off and lap the valves and change the valve stem seals. Yes, you would lose compression out of both valves if they're too tight. __________________ 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
	0

09-18-2011, 04:16 PM	#17
wilserchinarider Join Date: Jun 2010 Posts: 380	Spud, damage during removal highly unlikely, the motor was hastily and gracefully lowered...the neglected still connected choke cable served as a nice tether to keep the engine from falling on my toe. My "shop manual" never mentioned removal of the choke cable. :wink: A little tricky removing the choke cable w/ an engine hangin on it I tell ya! I did look at a donor bike this afternoon... http://jerseyshore.craigslist.org/mcy/2579265613.html Funny how they always put the pretty side in the ad. Bike was a non runner w/ the harness all messed near the case by the front sprocket. Also, it didn't appear to have similar plugs for the two engine wire looms? I passed, as it is also a 19" / 16" wheel size w/ not too many crossover parts to the Lifan GY5. It was a 163FML fwiw.
	0

09-20-2011, 08:25 PM	#21
wilserchinarider Join Date: Jun 2010 Posts: 380	A donor was located this afternoon. It's a BMX Powersports w/ a large tag that reads manufactured by Shineray. The bike is beat up a bit but doesnt appear to have had much use. I might have overpaid at $300, but Im over a barrel so to say. The motor is a 169fml. I've read some mixed reviews on the short stroke motors....a touch more power / higher redline up top but a tad less torque down low??? We shall see. Awaiting the transplant... Thanks for all the help and advice guys!
	0

09-20-2011, 10:19 PM	#24
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Looks like a good deal. That is a good workhorse engine. I think you will be happy with it.
	0

09-20-2011, 10:24 PM	#25
MICRider Join Date: Oct 2009 Location: Alberta, Canada Posts: 3,274	I think a running bike for $300 is a great deal! Hoping the transplant goes smooth as silk for you
	0

09-21-2011, 08:16 AM	#27
wilserchinarider Join Date: Jun 2010 Posts: 380	Thanks for the valve adjustment advice! Popped the valve cover off last night and the valves were very tight! I could not percieve any slack in the rockers at all and couldn't get the thin .002" to pass! The valve cover inside appears a darkish / stained like dark brown oil. The cover off my existing engine is squeeky clean silver aluminum color on the inside. Might this motor have been pushing exhaust gas out a valve that wasn't completely shut and burnt a valve? I did loosen up the valves and the motor appears to have a little better "pop" on the compression cycle w/ my thumb over the spark hole. Hah real technical. The donor motor was hard starting, would idle for 5 seconds, stall and restart and would eventually only idle for a minute or so untill it would take throttle. I did run the bike around in first gear and it appeared to run "normal". At this point I think I will set the valves and install the motor and see how it runs. I think I could use the top end from my failed motor, but I don't think i will take the head off the donor...sound reasonable? Thanks guys!
	0

09-21-2011, 09:37 AM	#28
gloud Join Date: Sep 2011 Location: Westhampton Mass USA Posts: 155	If it where me (and I did just do this with my possible donor motor for my XL175) I would pull the head while you have it out. to clean the valves you will need a valve spring compressor. (sears or Ebay) but it only take an hour or less to pop it off and clean it all up. (you will need new gaskets) Or just mount it up and throw some seafoam in the gas to clean the valves. (sounds more like an option for you. ) Where are you located if you are east coast us I would be happy to help. (I am in mass.)
	0

09-21-2011, 11:43 AM	#30
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	I'd do nothing more than set the valves install the motor ride and enjoy. __________________ Happy to serve.
	0