xlr125 header on lifan gy5

Frog · 12-10-2009, 03:22 PM

Hi

I believe the standard header pipe (with a bulge in it) may be restrictive.

After a lot of looking at photos I bought a second hand Honda xlr125 header. This bolted straight on to my Lifan GY5 200 with standard silencer.

Quite a lot of XLR stuff looks like it may fit..............

Yet to try it and see if it is breathing easier but it looks good!

Cheers

Frog

Weldangrind · 12-11-2009, 02:18 AM

Did the ID of the original pipe and the XLR pipe match? We actually found a GIO 250 header that fit my son's XR200 head, and it had a larger ID. We're hoping that it will breathe a little better than before.

Frog · 12-11-2009, 04:45 AM

Quote:

Originally Posted by Weldangrind

Did the ID of the original pipe and the XLR pipe match? We actually found a GIO 250 header that fit my son's XR200 head, and it had a larger ID. We're hoping that it will breathe a little better than before.

ID was the same (maybe 0.5mm larger) but with a tidier weld at the mainfold end and of course the bulge (? cat ? something) in the orignal pipe is absent.

It may make no difference but it also replaces the horrible heatshield that comes with the gy 5

Frog

Weldangrind · 12-11-2009, 11:33 AM

Sounds like a good move. After you have tested the new pipe, do you plan to chop up the old one and see if the bulge is a cat? I can't imagine that the Chinese are trying to emulate a Power Bomb from FMF.

Frog · 12-11-2009, 12:54 PM

I wondered about that as it does look similar. I do not know how these work or what is in side a power bomb...

In the Lifan pipe there is an obstruction at the bulge - tested by passing a flexible grab and hitting something!

5 years ago I managed a hospital that included an endoscopy suite amongst other things - would have a good look if I still did!

Can not think they would put a cat on one either ..................

Cheers

Frog

Cal25 · 12-11-2009, 02:35 PM

My HiBird has the bulge in it. Cut it open with the chop saw. Inside was a a soft , thin, metal that resembled corrigated cardboard all rolled up.
I cleaned it all out and slober welded it back together with my arc welder and the skinniest rod I had. The biggest thing I noticed was a huge decrease in the amount of heat that radiated from that part of the pipe. I considedered it worth the effort.

Weldangrind · 12-11-2009, 09:46 PM

That definitely sounds like a honeycomb catalyst. I'd lose it.

To respond to your comment Frog, the Chinese are probably sticking cats on anything street legal these days, just because it's easier than singling out California-bound bikes. I believe that even the off-road atv's in California have emissions controls now. :roll:

Frog · 12-12-2009, 04:14 PM

Thanks folks - Riding the bike without it is a definate improvement - so I'm happy with the change!

cheers

Frog

Weldangrind · 12-12-2009, 09:06 PM

Have you dropped the clip on the jet needle to compensate for the additional exhaust flow? You definitely don't want to run too lean.

Frog · 12-13-2009, 05:55 AM

Fitting a new three stage POSH CDI - with the increased flow and advanced ignition I'll certainly raise the needle!

The CDIs are currently less than Â£10 (around $15 I guess) on eBay and well worth a try.

Will report back on that soon.

Frog

12-10-2009, 03:22 PM	#1
Frog Join Date: May 2008 Location: Hampshire England Posts: 191	xlr125 header on lifan gy5 Hi I believe the standard header pipe (with a bulge in it) may be restrictive. After a lot of looking at photos I bought a second hand Honda xlr125 header. This bolted straight on to my Lifan GY5 200 with standard silencer. Quite a lot of XLR stuff looks like it may fit.............. Yet to try it and see if it is breathing easier but it looks good! Cheers Frog
	0

12-11-2009, 02:18 AM	#2
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Did the ID of the original pipe and the XLR pipe match? We actually found a GIO 250 header that fit my son's XR200 head, and it had a larger ID. We're hoping that it will breathe a little better than before. __________________ 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

12-11-2009, 11:33 AM	#4
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Sounds like a good move. After you have tested the new pipe, do you plan to chop up the old one and see if the bulge is a cat? I can't imagine that the Chinese are trying to emulate a Power Bomb from FMF. __________________ 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

12-11-2009, 09:46 PM	#7
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	That definitely sounds like a honeycomb catalyst. I'd lose it. To respond to your comment Frog, the Chinese are probably sticking cats on anything street legal these days, just because it's easier than singling out California-bound bikes. I believe that even the off-road atv's in California have emissions controls now. :roll: __________________ 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

12-12-2009, 09:06 PM	#9
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Have you dropped the clip on the jet needle to compensate for the additional exhaust flow? You definitely don't want to run too lean. __________________ 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

12-11-2009, 12:54 PM	#5
Frog Join Date: May 2008 Location: Hampshire England Posts: 191	I wondered about that as it does look similar. I do not know how these work or what is in side a power bomb... In the Lifan pipe there is an obstruction at the bulge - tested by passing a flexible grab and hitting something! 5 years ago I managed a hospital that included an endoscopy suite amongst other things - would have a good look if I still did! Can not think they would put a cat on one either .................. Cheers Frog
	0

12-11-2009, 02:35 PM	#6
Cal25 Join Date: Feb 2008 Location: Terrell and Grapevine Tx. Posts: 1,585	My HiBird has the bulge in it. Cut it open with the chop saw. Inside was a a soft , thin, metal that resembled corrigated cardboard all rolled up. I cleaned it all out and slober welded it back together with my arc welder and the skinniest rod I had. The biggest thing I noticed was a huge decrease in the amount of heat that radiated from that part of the pipe. I considedered it worth the effort.
	0

12-12-2009, 04:14 PM	#8
Frog Join Date: May 2008 Location: Hampshire England Posts: 191	Thanks folks - Riding the bike without it is a definate improvement - so I'm happy with the change! cheers Frog
	0

12-13-2009, 05:55 AM	#10
Frog Join Date: May 2008 Location: Hampshire England Posts: 191	Fitting a new three stage POSH CDI - with the increased flow and advanced ignition I'll certainly raise the needle! The CDIs are currently less than Â£10 (around $15 I guess) on eBay and well worth a try. Will report back on that soon. Frog
	0