163 FML cylinder head - Page 2

ejcycles · 12-19-2008, 08:38 PM

Quote:

Originally Posted by elroyjetsn

This picture is a head for a GY-6 150cc Scooter engine. The engine sits almost Horizontal, and yes it is an OHC engine. The camshaft for the GY-6 engine sits in the head with a carrier over the top of it. This engine is used in almost all 150cc CVT atvs too.

elroyjetsn · 12-20-2008, 08:21 AM

Oops, a GY-6 scooter??

That's weird. Well scratch that one! :oops:

katoranger · 12-20-2008, 10:38 AM

Bruce is back.

Allen

Oklahoma_Outlaw · 01-07-2009, 03:10 AM

Quote:

Originally Posted by bobberjohn

Anyone know where I could purchase a new
or used (no cracks!) Lifan 163 FML head? Looking
to do a full port job, and still want to keep my
low mile stocker as a backup.

I have a complete new untouched 163fml head I'd sell. It was a very tough item to acquire. I took the head to George Shear of Total Concept Racing Engines to evaluate. George has 49 National Championships with his engines in the last 27 years and while he is not completely familiar with the Lifan based engines this was his evaluation.

If you slotted he bolts on the intake to line up better with the head you could "lightly" remove enough material to port match the head to the intake.

You could polish the intake runner. But if you try a full port job and grind on the runner walls you will most certainly bust through. The intake walls are paper thin and probably 2mm or less thickness.

He thought he could get a little better performance out of it but without modifications to the rotating assembly it would not be enough to make it worthwhile.

My plan was to go ahead and polish the intake and slot the intake... but I've got so many projects right now with these bikes I havent had the time. I'd probably sell it if someone wanted it.... if not I'll eventually get around to working on it.

bobberjohn · 01-07-2009, 06:49 PM

Seems like by raising the valve guide up to
the roof and doing a good bowl clean up, the head would
flow much better. Did a few little 110 Lifan heads, and they
are deplorable in there. No wonder they make 8 horspower!
Working on getting my 200 Lifan powered bobber street legal
right now. Gonna do the cylinder head work after I deal
with Florida DMV on a scratch build. Oughta post a few pics, I reckon...

12-20-2008, 08:21 AM	#17
elroyjetsn Join Date: Mar 2008 Location: West Virginia Posts: 629	Oops, a GY-6 scooter?? That's weird. Well scratch that one! :oops: __________________ Wayne Wildfire WF300-SP
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12-20-2008, 10:38 AM	#18
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Bruce is back. Allen __________________ You meet the nicest people on a Honda Clone.
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01-07-2009, 06:49 PM	#20
bobberjohn Join Date: Jul 2008 Posts: 18	Seems like by raising the valve guide up to the roof and doing a good bowl clean up, the head would flow much better. Did a few little 110 Lifan heads, and they are deplorable in there. No wonder they make 8 horspower! Working on getting my 200 Lifan powered bobber street legal right now. Gonna do the cylinder head work after I deal with Florida DMV on a scratch build. Oughta post a few pics, I reckon...
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