Board index Flathead Power-Technical Questions, Answers, and Suggestions Knuckles lower valve tins

lower valve tins

Post Sat Feb 16, 2013 6:42 pm

Posts: 219
Location: Georgia
Does anyone offer a quality lower tin replacement? Vtwin has a listing but their quality has always been questionable.
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Post Wed Feb 20, 2013 1:08 pm

Posts: 152
Location: Carver, MN

I have recently had the displeasure of having to purchase a new set of V-Twin brand Knuck heads. The rest of the heads needed a complete rebuild to be serviceable, but the lower tins were surprisingly good. The biggest flaw that I noticed is that the oil tubes have a "copper" plating which did not "take" the parkerizing. In one way that is a good thing since it makes them easy to spot as not being originals.

BTW- the earlier spring cups from V-Twin were not as nice, with less than normal width on the top gasket surfaces

Post Fri Feb 22, 2013 10:39 am

Posts: 219
Location: Georgia
Lee W
Thanks for the reply. I have a set ordered. I will post with the quality and try to post pictures of the valve guide mods also.
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Post Thu Mar 07, 2013 3:51 pm

Posts: 219
Location: Georgia
I did get the lower tins in from Vtwin. Haven't really started the install process yet. I will try to get pics as it goes.
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Post Thu Mar 07, 2013 11:37 pm

Posts: 2688
Location: Los Angeles, CA
They are copper lines, not copper plated. Originals had steel lines.

Post Fri Mar 08, 2013 3:57 pm

Posts: 152
Location: Carver, MN

Chris, my assumption that the lines were copper plated was based on that they were brazed into the cups. After reading your comment though, I realized that I did not really know if you can braze to copper or not (still don't). So I took a closer look.

I was able to sand off a section of the copper plating, and I even used some gun bluing on it. Sure enough the sanded section took the color OK. Of course that's not to say that they did not use copper lines on some of their covers, only that these recently purchased ones have steel.

Post Sun Mar 10, 2013 7:44 pm

Posts: 219
Location: Georgia
Lines are not copper. They look that way but can be picked up with a magnet.
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