[diesel_mercedes] Melted Piston

 


Thanx Mark ;

? Did it hole the piston or do the usual fry the edge of the piston crown down into the top ring land ? .

Yes, air cooled engines need higher octane but also they need really sharp  timing, few are designed to have more than 29 ~ 30 DBTDC at full advance and as the timer wears it tends to advance a bit more, often too much if you use the base timing mark....

This is why I love and use my 50 year old Craftsman inductive dynamic timing light with the advance dial on the back ~ it allows me to set the ignition timing *exactly* where I want it under actual road RPM .

It also allows easy testing of advance curves and rates of advance and return, it's not uncommon to have slow return of timing advance..

I wish I could go to TEXAS, I love it there .

Looks like I may be driving up to the S.F. Bay area soon for free old Honda Moto parts =8-) .

-Nate
LIVE in the world as it is, WORK to make the world as it should be


                                        MARK  wrote:


 

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...!)

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Re: [diesel_mercedes] Royal Enfield INT650 Retro

 

Yeah, Honda has a lock on the "Interceptor" name here, even though Royal Enfield had been making Interceptors years before Honda even made a bike larger than 305 ccs....

Mark (in Port Aransas, TX)
On 09/19/2020 3:53 PM Joe Hupp josephhupp@bigpond.com [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:


 

Nate, Mark, et al.

Hard to believe that your INT650 is the same as the Interceptor 650
(called the Interceptor INT650) in Australia!

https://www.royalenfield.com/au/en/motorcycles/interceptor/#motorcycle-specifications

Joe

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Re: [diesel_mercedes] Royal Enfield INT650 Retro

 

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 .

-Nate
LIVE 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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