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Author Topic: 650 or 550 cam  (Read 1508 times)

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Offline MetroRedneck

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650 or 550 cam
« on: July 04, 2017, 09:02:40 PM »
First question because typically I find what I need by searching.

Tearing into a 78 550 and need help identifying the cam. I found a 650 cam gear in a parts bucket. I don't know if it was swapped at some point in the past. I do not have another 550 or 650 camshaft not in an assembled engine to compare to. Anyway to ID from the pics or is there a measurement I can compare? 




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Offline MetroRedneck

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Re: 650 or 550 cam
« Reply #1 on: July 08, 2017, 03:49:20 PM »
Once again the forum comes through for me. I'm almost certain it's a 650 after reviewing this photo. I've looked at several topics and other pics and this is the best reference so far.

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Offline Stev-o

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Re: 650 or 550 cam
« Reply #2 on: July 08, 2017, 07:20:55 PM »
Did your bike have a working 550 tach on it?   I do not believe the 650 cam is compatible with the 550 tach. 
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Offline cb650

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Re: 650 or 550 cam
« Reply #3 on: July 09, 2017, 05:12:36 AM »
measure a lobe
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Offline MetroRedneck

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Re: 650 or 550 cam
« Reply #4 on: July 09, 2017, 08:28:11 PM »
Quote from: Stev-o on July 08, 2017, 07:20:55 PM
Did your bike have a working 550 tach on it?   I do not believe the 650 cam is compatible with the 550 tach.
They aren't. It didn't. Bike is a basket case. It has 3 tach cables in various piles.

Quote from: cb650 on July 09, 2017, 05:12:36 AM
measure a lobe
Do you have measurements?  Can you post them?  I searched and didn't find anything 100% other than 650 cams have 5 spirals. No idea if 550 have the same. I don't have reliable measurements to compare against unless I pop the head cover off my 650.
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Offline cb650

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Re: 650 or 550 cam
« Reply #5 on: July 09, 2017, 08:41:32 PM »
service limits for the 650 are 35.6 mm intake and 35.3 exhaust.
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18 grand and 18 miles dont make you a biker

Offline MetroRedneck

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Re: 650 or 550 cam
« Reply #6 on: July 10, 2017, 07:02:00 AM »
I didn't look hard enough for service limits in the manual - a quick glance didn't jump out at me.  Thanks for the info. 

Also found the 550 at intake:35.85 and exhaust:34.45 but I think there's a typo in there.  Right next to it is listed standard value of the intake at 34.93-34.97.  I guess Honda had a cam that grew as it wore down.  I'll go with over and under 35mm for ID purposes.
« Last Edit: July 10, 2017, 07:06:09 AM by MetroRedneck »
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Offline MetroRedneck

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Re: 650 or 550 cam
« Reply #7 on: July 11, 2017, 06:48:21 AM »
So verified 650 cam.  Intake was upper end of 35mm and exhaust was near 35.5mm.
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