mileage

[Barry]

That's an interesting one and in percentage terms a very big difference. The gear box absorbs power at the best of times. Failing bearings and resultant misalignment would absorb even more than usual and use more fuel.  

[Andrewsteward]

So here's a grim thought: not that long ago I was getting around US 33 mpg.. I ended up getting the transmission rebuilt and now I'm up to 41+ mpg.

Either the transmission rebuild or the new rear shock made the difference.

mmm lests note hope for a tranny re-build.
just pulling carbs apart now

[Andrewsteward]

Ok first report-nothing much to report though.

Needles position 3 though left side circlip a little dis-logged but only about 0.5mm difference.

Main jet 145. Couldn't tell what the needles were. No markings.

Still running well, havnt run a full tank yet so cant tell about consumption.

plug colours are perfect.

Compression is at 110/side so yes getting tired, so maybe adding to the consumption problem.

Just wondering if the clutch maybe slipping? Its not apparent but just a thought.
How many revs should it be at 80k or 50mph?

I do have a noise when the clutch is engaged. I might try and post it

[Barry]

....Couldn't tell what the needles were. No markings.

The needle should be a 46-241 which is used in the majority of Bing carbs on Airheads. I suppose it's possible someone substituted the wrong needle but it's not something you hear about often if ever. I have some reasonably accurate dimensions for a 46-241 needle if you want to measure yours. They are easy to measure as our needles are a simple straight tapered cone. That's not true of all Bing needles in other applications though.


Needle diameter 2.45mm

length of tapered section  23mm

Minimum diameter of taper 1.2mm

[Andrewsteward]

Thanks Barry, I will check on the weekend.

[Slow]

I just seem to be lucky then, my motocycle gives me 20km/l and that is combined cycle, hi way and town driving.

[Barry]

OK multiply 20km/l by 2.824809363 and we get 56.5 MPG (IMP) or 47 MPG (US).

Not bad at all.