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Carb jetting for '59 R60
- Bikesmith01
- Posts: 46
- Joined: Sun Jul 12, 2020 4:55 pm
Carb jetting for '59 R60
I'm Jon. I'm new here. I acquired a 1959 R60 so recently that I don't even have it yet. It's still en route from Boston. I'm really excited about diving in and fixing it up. I'm familiar with both older and newer vehicles than the R60, but this will be my first time working on a bike from the 50s.
Among (many) other things I'm planning to tear apart and familiarize myself with, I'm thinking about the carburetors. Specifically, jetting for altitude. I live at about 6,000 feet (1800 meters), and I expect the bike will spend most of it's time at this altitude and higher. Some of my favorite rides take me above 8,500 feet (2500m). So I've rejetted all of my carbureted vehicles for the altitude. I expect I'll want to do the same for the R60.
Do any of you have any experience with this? Am I right in thinking that jetting for altitude will be more or less a necessity? Any recommendation on jets, or sources for jets?
Thank you in advance for any advise you may have!
-Jon
Jon the Bikesmith
1959 BMW R60
1940 Royal Enfield WD-C/O
1942 Chevy 3/4-ton special Flatbed
1985 BMW K100RS
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Re: Carb jetting for '59 R60
http://www.benchmarkworks.com/articles/tech/carb2.html
And here's how you can figure what you need to do to rejet your carbs to compensate for altitude:
http://www.benchmarkworks.com/articles/tech/carb2.html
You can also experiment with adjusting the clip position on the jet needle. Moving the clip up on the jet will lower the needle and so lower the fuel to air ratio in mid-throttle ranges.
I run my 1967 R69S at ~7000 feet and a bit above here in northern New Mexico with 125 main jets. Stock is 135. I haven't changed the clip positions, though a knowledgeable friend suggested that that's all he's ever done, leaving the main jets stock, and he did a speed record at Bonneville on an R50, which is at 5000 feet. The bike runs fine, though the back ends of my mufflers are still a bit sooty, so maybe I should change the clip positions.
Hope this helps.
1967 R69S, original owner; 1978 R100S; 2001 R1150GS; 2002 R1150RT
- Bikesmith01
- Posts: 46
- Joined: Sun Jul 12, 2020 4:55 pm
Re: Carb jetting for '59 R60
Jon the Bikesmith
1959 BMW R60
1940 Royal Enfield WD-C/O
1942 Chevy 3/4-ton special Flatbed
1985 BMW K100RS
******************************************************************
Re: Carb jetting for '59 R60
https://www.horizonsunlimited.com/tech/carbjet
1967 R69S, original owner; 1978 R100S; 2001 R1150GS; 2002 R1150RT