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1969 CL450 US Barn Find Restoration

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Bryanj:
Might be worth checking part numbers as 250/350K twins had a similar filter

MrDavo:
CSMNL had just one in stock, at a reasonable eu20, but the postage is (as usual) at least that, I also ordered new O rings for the sump plug and oil filter while I was at it.

DS also listed the part, £65 plus P&P!!! Feck that.

MrDavo:
While waiting for the oil spinner and O rings, I decided to take the tank off and get on with the rest of the service. I can’t find my multimeter though, so checking the timing didn’t get done, I use it to see when the points are opening.

I did do the valve clearances though, and found to my horror that the left inlet valve adjuster spindle was 180 degrees out, with the ‘T’ facing inwards. I hadn’t noticed any rough running, but apparently it doesn’t do them any good to have them the wrong way round, the geometry is different, so just as well I decided to service the bike early. I was relieved to see that the cams are still pristine, with no scuffing, I readjusted the clearance as when I built the engine, at the size if my smallest feeler gauge, .005 mm. I think the book says .003, but it’s better than running it tight. Looking at the forums some of our US cousins do that, others set it by ear, which sounds like a stupid idea to me.

A couple of the inlet valve cover screws barely tighten - there is a metal plate as well as a gasket, I think a previous owner hasn’t taken into account that the screws are longer because of this, mixed them up and buggered the threads. It looks an awkward place to try and get a helicoil inserted in situ, though, so hopefully it will wait until some time in the future when the motor has to come out anyway.

Bryanj:
When you are doing valve adjustments every day 2 thou you can just feel movement and 3 thou you just hear a click

MrDavo:
Ah, right Bryan, I thought they were suggesting setting the gap by ear with the engine running! Though I have seen posts from people who do their timing like that. Using my smallest feeler gauge I got it so I could just feel movement but not really hear anything so that seems about right.

My multimeter arrived in the post, so I checked the ignition timing too, it was firing a little late so I adjusted it.

Out for a test ride, all ran well, but the most noticeable difference was running from a cold engine. Previously the bike had misfired badly going up our hill with a cold engine, running on 1and a half cylinders, and not really run right until I’d done a mile or so. That’s all gone now, so the neighbours won’t raise an eyebrow and think ‘God, that sounds rough’.

I’m wondering if having the left inlet cam adjuster eccentric the wrong way round would have been affecting the valve timing enough to cause that?

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