Author Topic: '72 Honda CB350F camshaft 180 deg off?  (Read 1258 times)

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Herbert09

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'72 Honda CB350F camshaft 180 deg off?
« on: July 12, 2009, 03:40:30 PM »
Howdy, I've got a 1972 Honda CB350F that I did a full rebuild on. When I turn it over all I get is an occasional backfire here and there from the residual fumes being blown through. I had a friend of mine who is a professional motorcycle tech look it over, check my valve clearances, point gap, and timing plate orientation. It's getting fuel, air and spark. So we've narrowed it down to either a compression issue or the possibility that I may have installed the camshaft 180 deg out of time. According to the clymer and a .pdf of the original service manual, it appears as though at T1.4, the camshaft should be installed with the lobes down at cylinder 4 and with the line across the sprocket parallel to the head.
Now then, page 58- fig.27 in the clymer manual depicts the sprocket bolt heads with dotted lines, which is consisitant in engineering drawings as being behind something- on the other side of the sprocket in this case. So I assumed the bike was being viewed in fig. 27 from the same side as the timing plate. Is this correct, or did I misinterpret the drawing?


Offline bistromath

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Re: '72 Honda CB350F camshaft 180 deg off?
« Reply #1 on: July 12, 2009, 03:45:32 PM »
180 degrees out shouldn't make a difference, call me crazy here, but with a wasted spark ignition...  ???
'75 CB550F

Offline d_soles

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Re: '72 Honda CB350F camshaft 180 deg off?
« Reply #2 on: July 12, 2009, 04:42:05 PM »
How good were the carbs cleaned?  :)

From what I've read, the camshaft being off 180 degrees doesn't really matter on these engines.  Maybe that's just the 500 series, though...

Doug
'75 CB550F - Field Beater at it's best....