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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Carb'
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<blockquote data-quote="davidd" data-source="post: 45237" data-attributes="member: 1177"><p>The original B push rods were silver steel, I believe. I have not been doing well on the killer B questions lately. The push rods in the photo above were stock SS. They were both brand new as were the followers and adjusters. I did not take the time to match them and one failed. </p><p></p><p>All aluminum works fine as long as it is the correct material. The 7075 rods that were used in the bike in the sixties bent immediately. The next set were 2024 and they lasted several seasons with no issues. With the aluminum, it is very important to match the cups. Having said all this, I have run the stock push rods to 8000 rpm with no valve bounce, so I cannot see any reason to use anything but stock push rods on a street bike. Even a very hot one. Why fool with aluminum? One of the advantages of the aluminum push rods to the racer is that you can make them up on the lathe quickly and choose your length, which can be a convenience.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 45237, member: 1177"] The original B push rods were silver steel, I believe. I have not been doing well on the killer B questions lately. The push rods in the photo above were stock SS. They were both brand new as were the followers and adjusters. I did not take the time to match them and one failed. All aluminum works fine as long as it is the correct material. The 7075 rods that were used in the bike in the sixties bent immediately. The next set were 2024 and they lasted several seasons with no issues. With the aluminum, it is very important to match the cups. Having said all this, I have run the stock push rods to 8000 rpm with no valve bounce, so I cannot see any reason to use anything but stock push rods on a street bike. Even a very hot one. Why fool with aluminum? One of the advantages of the aluminum push rods to the racer is that you can make them up on the lathe quickly and choose your length, which can be a convenience. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Carb'
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