I'm not really sure why that piston melted. It's the first time I've ever had this happen. I bought this bike (and it's 1970 twin) from the dealer salvage/donation auction some 15-years ago. It was reading 12,000 on the clock. I'm not sure if it was already compromised from before I bought it, or what. It DID occur on an especially hot day here, and after I'd been pushing it pretty hard.
I always run high octane in the the bikes, especially on hot days, even at this altitude (where the thinner atmosphere equates to an effectively lower compression pressure). Below 40 degrees F, 87 octane is OK.
My high school shop teacher preached that all air-cooled vehicles should run premium. In addition to a CB750 (with HondaMatic!), he also had a Corvair.
Mark (currently in Port Aransas, TX, where the cool, wet weather from Beta is welcomed after a hot, dry Mile High summer...!)
On 09/19/2020 7:54 AM Nate vwnate1@yahoo.com [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:
Thanx Mark ! .
That's a good looking and great sounding bike, I'm sure the EFI makes it run far better increased fuel economy and all that .
The six speed tranny sound nice too although I wonder if it is because it needs it , 47 horsepower should be plenty .
I still have my battered 2000 Kawasaki W650, I'd love to get it running again .
? do you have any ideas why the piston melted ? . high speed runs on foo-foo gas perhaps ? . I know supposedly you can run regular in anything but I no longer use it in any thing because the difference in running even in a CT90 is palpable and it degrades so quickly .
My current daily ride is the Brazilian made 1984 Honda CB125S (e) ~ it's a tiddler and so doesn't beat my broken back, neck and forearm to death .
-NateLIVE in the world as it is, WORK to make the world as it should be
MARK wrote :
I managed to melt down the right piston on my '72 CB450 last month. (ZOIKS!) The '69 BSA Rocket 3 has held up without complaint, though it's using too much oil. I suspect it needs a liner and piston/ring job....
Years ago, I was asked, "If you could buy any new car made, price be damned, what would you get?" I replied that I couldn't think of one, but there was probably a motorcycle out there that I would consider. More recently, I learned of the Royal Enfield INT650. If I should ever buy a new... anything (it would be my first, ever), it's probably on this page:
Mark in Centennial, CO (still riding at least 28 days out 30, all year long)
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Posted by: MARK BRAUER <beeser@comcast.net>
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