I hear you, LM. I was using side flex or droop as I think Gman called it, based on how metal watch bands tend to droop when held on edge when the pins are worn. It's a common way for used Rolex bands to be assessed for wear.
I assumed that the pin and/or plates wore at the pivot points, which should induce more side flex. But I'm not so sure about that now. I'm starting to think that the pins might distort or possibly the plates stretch just a slight amount. Hard to believe the plates stretch, but I would imagine it is possible.
Good news is I have my new chain now and as soon as I get a new drive sprocket, I'll be good to go.
I really think that the chirping/whirling noise I heard at part throttle was the chain dragging across the shifter shaft.
regards,
Rob
Primary chain rub on top bolt hole boss of left outer cover
That would be extreme ware/stretch for sure. .........lm
Hi Ed,
I know that Mr. Clinton likes cigars, but I don't know what you mean with Flex in correlation with Mr. Clinton. I meant with side flex that Rob talks about. It's indeed not an elusive indicator of wear. Anyway, have a nice election day (or how it's called) ? Jensen assembly of Japanese motorcycles requires great peace of mind (Pirsig)
Well it sure can be here.
Which chain ya think will ware the most. A primary or drive and why? I voted the first day I could as I'm not one to wait and possibility miss casting my desires. .............lm
Hi,
Now that is a question with two answers, and a lot of if's, if you know what I mean. From a mechanical point of view the primary chain will wear out faster then a drive chain for several reasons, it runs faster and the arc of the primary gear is very small, so the chain has to change directions too quickly, so the forces on the pins are high. Because the arc is so small, the force roller is very high, because there are only a few to transfer the force. On top of that, the primary chain is much shorter than the drive chain, so with every mile of road, the primary chain has to do more turns than the much longer drive chain. But, it's running in an oil bath, and from a practical reason, the drive chain is less protected and dirt and moister will penetrate the rollers, and wear them out. But if the chain is in a closed chain case (dream), and maintained well (every 2000 miles or so rinsing with petrol, drying and after that putting it into an hot grease bath), the drive chain will live longer. On a CB or CL, and bad maintenance it's the other way around, the drive chain will wear faster, but that is because of the improper maintenance. Jensen assembly of Japanese motorcycles requires great peace of mind (Pirsig)
So it doesn't matter if one is a pin type (no moving parts) running at all times in oil and the other is a roller which can only be lubed (as a rule) from the outside and as the sprockets and rollers get hotter and hotter and no lube added ya still think the primary chain wears quicker?
I've replaced many drive chains and as yet on my riders I've never needed to replace a primary chain.. ..lm
Hi Ed,
I have replaced the chain on my '67 and I found some really bad chains in several engines. Indeed also engines with wear on the clutch cover, and on the shift spindle (from the chain). With the chain I also replaced the clutch and primary gear, just a better one, not NOS. Who think is going to win the elections ? Jensen assembly of Japanese motorcycles requires great peace of mind (Pirsig)
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