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Topic-icon what gas should I use for my 1970 R75/5 ?

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4 months 2 weeks ago #5958 by NB58
I have a 1970 R75/5, what gas do you recommend for it ?
I can get ethanol free gas with all 3 usual octanes.
Thank you for your advice.
Nicolas

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4 months 2 weeks ago - 4 months 2 weeks ago #5959 by Wobbly
Replied by Wobbly on topic what gas should I use for my 1970 R75/5 ?
• All high performance air-cooled engines should have the highest octane you can find. Octane helps prevent spark knock that can easily damage your engine.

• As great as the appeal of non-ethanol fuel may be, I'm not sure you get the same cleaning agents as in the regular "high test" fuels. True, if you're going to ride intermittently over (say for instance) the winter, then non-ethanol would be highly preferable. But during spring and summer when riding time is plentiful, I opt for the less expensive name-brand fuel with the built-in cleaning agents. This is because all fuels leave scuzz in the carburetors, which ultimately needs removal. It just so happens that the ethanol laden fuels simply start to leave deposits earlier.

So as long as fuel is moving through the system, I'd rather have the standard high octane fuel.

You may wish to read this... www.toptiergas.com/

Hope this helps.

Don't hide 'em, Ride 'em !!
#15150
Last edit: 4 months 2 weeks ago by Wobbly.
The following user(s) said Thank You: NB58

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4 months 4 days ago #6084 by jbearden
Replied by jbearden on topic what gas should I use for my 1970 R75/5 ?
A Valero near to me has ethanol-free 90 octane. Do you think it's ok for my '84 R65 & '94 R100RT?

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4 months 3 days ago - 4 months 3 days ago #6087 by Wobbly
Replied by Wobbly on topic what gas should I use for my 1970 R75/5 ?

jbearden wrote: Do you think it's ok....

• Do I think that's the highest octane available to you ? No.
• Do I think your engines will sustain permanent damage ? No.
• Do I think the carbs will receive the cleaners they need ? No.
• Would I suggest adding supplemental cleaning agents to the fuel ? Yes.

Don't hide 'em, Ride 'em !!
#15150
Last edit: 4 months 3 days ago by Wobbly.

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4 months 5 hours ago #6124 by 14979
Replied by 14979 on topic what gas should I use for my 1970 R75/5 ?
I'd say it depends. Here in Maine I run the cheapest stuff that Shell or Irving sells. But then our weather is pretty cool and I cruise on fairly level ground and ride solo.
Also I've updated 1981 R100RT with modern valve seats that can handle unleaded fuel.
In fact fuel is so much better generally then 40 years ago that I even run the same kind of fuel in my 1987 GL1200A fully loaded two up in hot Florida weather.

1981 R100RT

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4 months 20 minutes ago #6127 by jbearden
Replied by jbearden on topic what gas should I use for my 1970 R75/5 ?
When I can't find that ethanol free gas, I almost always use premium (usually Shell)

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