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Mileage 750 commando 1971

Classic Norton Commando Motorcycles.

Mileage 750 commando 1971

Postby rob carter » Thu Apr 20, 2017 12:16 am

I have quite a small tank on my commando,about 9 litres.I was wondering how many miles would i get out of it.
The tank itself has no indentation on it and it looks like it could be from an interstate ,the cap is in the front end in the center of the tank.The tank has a narrow drivers end slope.
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Re: Mileage 750 commando 1971

Postby Rohan » Thu Apr 20, 2017 12:47 am

It sounds more like its a HiRider tank.
(The Interstate tank was +20 litres.)

9 litres is exactly 2 imperial gallons.
If you were getting 40 mpg, that'd give you 80 miles.
maybe a shade more, 90 miles if you were getting 45 mpg.

Except the reserve will eat a litre or 2, so its range isn't too far.
You'll get to meet a lot of gas station folks.

The Roadster tank was 10 litres - and will fit in the same space ?

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Re: Mileage 750 commando 1971

Postby illf8ed » Thu Apr 20, 2017 11:49 am

You can figure it out by fuel mileage expected. The best I've gotten is 60mpg. The worst 45mpg. This on my '72 750. So if the small tank holds 2 gallons you can expect 90 miles if you go to the last drop in worst case. Obviously any fuel leaks not considered :)
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Re: Mileage 750 commando 1971

Postby worntorn » Thu Apr 20, 2017 11:59 am

Then there are the times that one encounters strong headwinds, or climbs a big pass or three, maybe two up with luggage. With scenarios like that, MPG can drop to some very low numbers. Sometimes you encounter a head wind while climbing a big grade with a loaded bike. It happens!

If you plan on doing long distance touring with the bike, the steel Interstate tank is a nice option. The version that came on the MK3 and possibly some 74 Commandos is slimmed down a bit from the earlier gigantic ( 6 imperial gallon?) Fibreglass version. Still holds a lot of fuel at about 5 imperial gallons or 22 litres.

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Re: Mileage 750 commando 1971

Postby CanukNortonNut » Thu Apr 20, 2017 3:49 pm

worntorn wrote:
If you plan on doing long distance touring with the bike, the steel Interstate tank is a nice option. The version that came on the MK3 and possibly some 74 Commandos is slimmed down a bit from the earlier gigantic ( 6 imperial gallon?)

Glen

+1
The interstate tank is great for long distance. My favorite. I have never needed to switch to the reserve on my 74 yet. From fill to reserve you would have a serious case of numb bum if it was all straight ride time. :lol: On steel roadster tanks I use the 2 hour rule.
Fill....drive and after two hours you are looking for gas station. The final gear has influence in your mileage. The 19 tooth compared to a 21 and Carburetor choice will have a significance for a given highway speed . Amals are not bad, if set correctly.
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Re: Mileage 750 commando 1971

Postby MikeM » Thu Apr 20, 2017 7:11 pm

My Hi Rider tank got me 60 miles. Your mileage may vary.
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Re: Mileage 750 commando 1971

Postby gripper » Fri Apr 21, 2017 3:15 am

Fit a reserve type tap on both sides to access all the fuel. With a reserve tap there is a chunk of fuel below the stack pipe that is not available without inverting the bike. Might just get you that extra 10miles to the gas station..........or not

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Re: Mileage 750 commando 1971

Postby kommando » Fri Apr 21, 2017 4:43 am

On a 69 TR6 Home market tank 2 reserve taps gives you 200 yds ;)
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Re: Mileage 750 commando 1971

Postby hankmarx » Fri Apr 21, 2017 5:41 am

I have gotten 88 miles to pushing, repeatably. My reserve gets me a whole blocks notice. That is with a MKIII, HiRider tank, and a single Mikuni.

Someday I will get an Interstate tank, until then, keep your eye on the odometer!
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Re: Mileage 750 commando 1971

Postby Rohan » Fri Apr 21, 2017 11:20 pm

gripper wrote:With a reserve tap there is a chunk of fuel below the stack pipe that is not available without inverting the bike.


If you have one reserve tap and one regular tap, leaning the bike over far enough so all the fuel sloshes over to the plain tap side should give you a litre or more extra to go. This is a whole lot better than pushing.

The toolkit is there so you can invert the tank, if you REALLY need to.
This is a fair bit easier than inverting the whole bike !!

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Re: Mileage 750 commando 1971

Postby tpeever » Sat Apr 22, 2017 7:58 pm

rob carter wrote:I have quite a small tank on my commando,about 9 litres.I was wondering how many miles would i get out of it.
The tank itself has no indentation on it and it looks like it could be from an interstate ,the cap is in the front end in the center of the tank.The tank has a narrow drivers end slope.
Rob Carter WA


I get about 105-120 miles from my Roadster tank (about 2.5 US gallons) before I hit reserve. I generally try to fill up at 100 miles.
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Re: Mileage 750 commando 1971

Postby Danno » Sat Apr 22, 2017 8:39 pm

MikeM wrote:My Hi Rider tank got me 60 miles. Your mileage may vary.


The SS clone is in that ballpark.

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