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Old 02-02-2010, 04:04 PM   #781
Assfault
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Help Needed !

My buddy smoked his motor due to the lack of oil.
It took out the cam, head, valves, piston, and cylinder.
He found and bought a new/used cylinder and piston,
but is finding a head hard to source in working condition.
Will a XR650L head work on his 93 XR600R ???
Or does anybody here have one for a reasonable price?
Thanks for any help.
Assfault
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Old 02-02-2010, 04:29 PM   #782
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This is an even better question if you are going to do the opposite swap due to electric start of the 650L needing to be automatically decompressed. In either case the answer is "yes". The positioning dowels do also match part numbers. The heads ARE different part numbers, but read on:

650L head part # 12200-MY6-670

600R part # 12200-MN1-680

If you can tell any difference between the photos ore even if they have differing parts is unimportant. What is important is whether it had the post 1988 decompression system with the cam decomp auto clutch. The cam chain width also, even if different, can be corrected. I have even used some unorthodox parts combinations from pre and post '88 valve trains that were made to work flawlessly. More part number research can be done at www.babbittsonline.com who has a microfische giving Honda part numbers unlike some OEM parts vendors. I do however have a price preference foe zanottis of Pennsylvania. Not that you'll be buying an OEM head. I actually did that on my XL600 believe it or not. Would have saved hundreds at zanottis. Never again with Bike Bandit. ugh.
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Old 02-02-2010, 04:35 PM   #783
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Quote:
Originally Posted by screwit
Has anyone put a Keihin 39 FCR on a XR600? If so how hard and was it worth the trouble? As always, any help is appreciated.

FWIW: i ran the mikuni flatslide setup from ballards i found it flat of bottom as it did'nt have a fuel pump like the keihin.





Quote:
Originally Posted by Zombie_Stomp
This is an even better question if you are going to do the opposite swap due to electric start of the 650L needing to be automatically decompressed. In either case the answer is "yes". The positioning dowels do also match part numbers. The heads ARE different part numbers, but read on:

650L head part # 12200-MY6-670

600R part # 12200-MN1-680

If you can tell any difference between the photos ore even if they have differing parts is unimportant. What is important is whether it had the post 1988 decompression system with the cam decomp auto clutch. The cam chain width also, even if different, can be corrected. I have even used some unorthodox parts combinations from pre and post '88 valve trains that were made to work flawlessly. More part number research can be done at www.babbittsonline.com who has a microfische giving Honda part numbers unlike some OEM parts vendors. I do however have a price preference foe zanottis of Pennsylvania. Not that you'll be buying an OEM head. I actually did that on my XL600 believe it or not. Would have saved hundreds at zanottis. Never again with Bike Bandit. ugh.


check out the squish/piston to head clearence difference also.
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Old 02-02-2010, 04:37 PM   #784
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Regarding the 650L and 600R head compatability; Not sure about combustion chamber volume, but maybe the only difference would be the air injection ports are drilled in the 650L head and not the 600R?
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Old 02-02-2010, 04:57 PM   #785
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Quote:
Originally Posted by brucifer
Regarding the 650L and 600R head compatability; Not sure about combustion chamber volume, but maybe the only difference would be the air injection ports are drilled in the 650L head and not the 600R?
What, the smog pump stuff? I thought the only interface with that was all on the cylinder.
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Old 02-02-2010, 05:07 PM   #786
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Head

What year is the XR600?


What damage was done to the XR head?


The XR650l head will bolt onto the XR600. The only problem is the air injection ports for the smog crap. If you intend to install the XRL head you can either weld shut the ports or fit a threaded plug in the passage ways. The ports MUST be sealed for the XRL head to work on the XR cylinder.
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Old 02-02-2010, 05:23 PM   #787
Assfault
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Quote:
Originally Posted by mcma111
What year is the XR600?

1993


What damage was done to the XR head?

Smoked the cam bearing surface and the combustion chamber where pieces of the piston dented it, pretty extensive in this area, the piston rammed pieces into the head. The valve seats/valves also to quite a beating.


The XR650l head will bolt onto the XR600. The only problem is the air injection ports for the smog crap. If you intend to install the XRL head you can either weld shut the ports or fit a threaded plug in the passage ways. The ports MUST be sealed for the XRL head to work on the XR cylinder.
The XRL head is on e-bay for $200 with all the valves. Seems cheaper than fixing, if possible. Will he need to big bore the XR600 cylinder to 100mm like the XRL ?

All parts being used and original are from 1993 or later.
the XRL head in question is from 1998 I belive.
Thanks for all the quick replies.
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Old 02-02-2010, 05:30 PM   #788
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The XR600 stock bore is 97mm. There are over size pistons available in +97.25mm, +97.5mm, 98.0mm and 100.0mm
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Old 02-02-2010, 05:39 PM   #789
Assfault
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Quote:
Originally Posted by screwit
Has anyone put a Keihin 39 FCR on a XR600? If so how hard and was it worth the trouble? As always, any help is appreciated.
I just bought a Keihin FCR41 pumper for my XR600R.
I will let you know how it goes next week when I get it and install it.
I had to order the airbox spigot from Sudco as it doesn't have one already.
I hope it will work like the Mikuni Pumper I installed on my XR400R.
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Old 02-02-2010, 05:40 PM   #790
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Quote:
Originally Posted by mcma111
The XR600 stock bore is 97mm. There are over size pistons available in +97.25mm, +97.5mm, 98.0mm and 100.0mm
Yea, I just didn't know if he HAD to or not. If it were mine I would, but he is financially challanged more than I right now.
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Old 02-02-2010, 06:51 PM   #791
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Here's my newly acquired 2000 xr600





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Old 02-02-2010, 07:13 PM   #792
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Quote:
Originally Posted by Zombie_Stomp
What, the smog pump stuff? I thought the only interface with that was all on the cylinder.
For the air injection tubes, yes, but those holes go up through the bottom of the exhaust ports. There doesn't appear to be any clamping surface under them if used on a 600 cylinder, so I would expect that they need to be securely plugged.
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Old 02-02-2010, 08:06 PM   #793
mcma111
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Quote:
Originally Posted by ajr49123
Here's my newly acquired 2000 xr600





Yep, That's one clean XR600. Doesn't look like it ever was ridden in the wet. No mud dried onto the header.

Welcome aboard.
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Old 02-02-2010, 08:53 PM   #794
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Quote:
Originally Posted by ajr49123
Here's my newly acquired 2000 xr600





Looks like it spent ten years in a plastic bag. Nice! But you're not going to
get it dirty, right?
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Old 02-02-2010, 09:10 PM   #795
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Quote:
Originally Posted by JAB
Looks like it spent ten years in a plastic bag. Nice! But you're not going to
get it dirty, right?
I'll admit I've already got it a little dirty, but i'm going to try to keep it in good condition, could be a collectors item if they ditch the 650l.
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