Gas milage on the NC30

[TommyTheGun]

Im only getting 150km/93miles until reserve, working out at about 30mpg. Thats mostly spirited riding on twisty roads. I am running 118f/120r jets. The carbs had 110s all round when i first got it before xmas and was advised to got to the 118f and 120r as i have an aftermarket end can on. But with the 110s I think i was getting about approx 190km before reserve. I am thinking of changing them down to 115f and 118r as i think its running too rich, end of the exhaust is black and sooty now which I understand to be an indication of richness. I'd also like to have a bit more range on the bike without having to look for a petrol station.

[speedy231278]

If the can is straight through, you'll get some soot on it anyway. If you're worried about being too rich, have a look at the plugs, or take it to a dyno and get the air/fuel ratio measured. My 35 has a sooty pipe, but the plugs are not covered in crap.

[TommyTheGun]

Had a look at the plugs and they look normal. Will maybe see about going to a dyno. I have the pilot air screws screwed out 2.5 turns would that have any effect on fuel consumption?

[Cammo]

Im only getting 150km/93miles until reserve, working out at about 30mpg. Thats mostly spirited riding on twisty roads. I am running 118f/120r jets. The carbs had 110s all round when i first got it before xmas and was advised to got to the 118f and 120r as i have an aftermarket end can on. But with the 110s I think i was getting about approx 190km before reserve. I am thinking of changing them down to 115f and 118r as i think its running too rich, end of the exhaust is black and sooty now which I understand to be an indication of richness. I'd also like to have a bit more range on the bike without having to look for a petrol station.

That's normal mileage for that sort of riding, leave it as it is. If you want more range then back off your right hand...

Exhaust colour is not a great indication of air/fuel ratio.

[TommyTheGun]

If thats normal for that kind of riding then Im happy enough as long as I know its running right. Hard not to twist the throttle on the wee bike such fun!

[speedy231278]

Crikey, bit of a difference yesterday! After three or four tanks going to a little over 190, on the way to Manston the bike started coughing at a truly pathetic 160. Last weekend I did mostly of m-way and dual carriageway miles at your normal sort of cruising speed and got good figures. Yesterday was more of the same. Normally I get better miles. Only thing I can think of is that it was extremely windy the whole way, and I was wearing a big backpack. Same on the way back, although as yet I don't know what I used because I did do enough miles to get to reserve. Due to the miserable cow at Texaco in Manston refusing me petrol until I took my lid off, I went further down the road and almost regretted it. 15.1 litres in at the next Shell (who were 3p cheaper, coincidentally the same 3p I was told they'd put the price up the day before the air show, funny that....), so that was a little close!

Anyone else think that a severe head/crosswind for most of the journey would have such a big effect? Wind, rain, almost new tyres and the Medway crossing on the A2 were, er, fun...

[Morespeedvicar]

I fill mine up when it needs it........................................

[speedy231278]

Well, technically it doesn't need filling up until it's run out...

But yes, I get where you are coming from and I very nearly ended up embarrassed because I'm too stubborn to take my lid off.

[bikemonkey]

Well, technically it doesn't need filling up until it's run out...

But yes, I get where you are coming from and I very nearly ended up embarrassed because I'm too stubborn to take my lid off.

I always take my lid off, just easier IMO

[gavins]

I fill while sitting on the bike, so i get a full tank. i don't mind taking my lid off to go pay but taking it off to fill up is just a pain. I'd have done the same.