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Old 10-15-2019, 08:30 AM   #16
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Checked valve clearance (X 24!) on a friend's 1979 Honda CBX. Now waiting for the valve bucket compressor tool and assorted O-rings and seals.







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Old 10-15-2019, 08:31 AM   #17
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sooooo cool!

guessing shims, because I don’t see followers ...?
how many needed adjustments intake/exhaust?

I graduated high-school in 1979, so the mighty CBX was one of the bikes I drooled over as a 17 y/o ...
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Old 10-15-2019, 08:45 AM   #18
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sooooo cool!

guessing shims, because I donít see followers ...?
how many needed adjustments intake/exhaust?

I graduated high-school in 1979, so the mighty CBX was one of the bikes I drooled over as a 17 y/o ...
Yep, shims. Luckily they are above-the-bucket type so no need to pull the cams! Only one valve was tight, all others were at the minimum. But we'll go ahead and re-shim them all to the loose end of the tolerance. We had the wrong compressor tool so could not do more than measure clearances yesterday.

This is the bike we recently reinstalled the carbs on, after getting them back from the rebuilder. It's a two owner bike with low miles that has the factory sport kit lower bars and rear set pegs. Very cool indeed!



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Old 10-15-2019, 09:22 AM   #19
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Yep, shims. Luckily they are above-the-bucket type so no need to pull the cams! Only one valve was tight, all others were at the minimum. But we'll go ahead and re-shim them all to the loose end of the tolerance. We had the wrong compressor tool so could not do more than measure clearances yesterday.


how are the cams driven? Looks like one chain from the exhaust cam to the crank and another chain between the cams?
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Old 10-15-2019, 09:24 AM   #20
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Cool! I don't know much about those bikes but thats a lot of valves to adjust!

Found an engine diagram online. Looks like two cam chains and some kind of primary chain too.

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Old 10-15-2019, 09:33 AM   #21
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Cool! I don't know much about those bikes but thats a lot of valves to adjust!

Found an engine diagram online. Looks like two cam chains and some kind of primary chain too.

how cool is that?

looks like the two-chain cam-drive allows the head to be an inch narrower on the intake side than it would be with a single cam-chain?

trying to figure out how the smaller-appearing sprockets driving the intake cam stay in time with the bigger exhaust cam sprockets ...?

edit: guess the exhaust sprocket does the half step down and then a smaller set of sprockets just spins the cams together at the same speed ...? (cams spin at 1/2 crank speed in 4T?)

can't say I recall another production motorcycle with the CBX's two chain set-up ...
doesn't your Dream 50 have an unusual cam-drive, also ...?

fun stuff! god bless Honda ...
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Old 10-15-2019, 10:37 AM   #22
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how are the cams driven? Looks like one chain from the exhaust cam to the crank and another chain between the cams?
Right, two chains/two tensioners

-Bill
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Old 07-05-2021, 07:39 AM   #23
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I completely forgot abut this thread!

Took the Moto Guzzi out to Tomales for lunch yesterday! Its running really well. I dropped the needles down on both carbs and it is totally happy.

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Old 07-05-2021, 08:47 AM   #24
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Old 07-05-2021, 09:28 AM   #25
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Old 08-18-2021, 08:17 PM   #26
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