Mr. Dazzle wrote: ↑Fri Jul 22, 2022 3:09 pm
There's a million and one pages written on Amal tuning, as you say start with the main.
I've just been out for about 40 miles on it, it's generally OK. Looking at the plugs after a sustained run on the A5 a high throttle they're a smidge on the dark side. The electrodes are biscuit brown but the outer rim is dark, but not with loads of deposits.
I think the outer rim gets dark from idling and low speed use and it seems to more or less always happen.
Plug colour from a full throttle run will be changed by just a few firing cycles at smaller throttle openings. That’s why you cut the ignition while still at full throttle.
Exactly. Looks like that one even comes with a blanking plug for when you're done tuning. Fit the boss somewhere unobtrusive, and blank it when it's running just-so. Or leave it on there so you have some notice next time it drifts out of tune or the jets vibrates itself out, before it holes a piston.
JackyJoll wrote: ↑Tue Jul 26, 2022 9:31 am
I’ve seen air/fuel instruments where you stick a long probe in through the tailpipe.
That's what they used on a dyno innit....the probe needs to be right up inside teh exhaust so you're only measuring exhaust gas. The AFR gauge reads quite small changes in the gas mixture, so you need to be quite a long way up the pipe ( ) to be sure you're not getting a mix of exhaust and outside air.
Mr. Dazzle wrote: ↑Tue Jul 26, 2022 9:39 am
It's not the looks which get me, it's the smell. It's hard to describe, but I'd say it's "unfiltered". Petrol, hot oil, rubber and hot metal.
If you can find a way to share the smell, I'd say the same about that! I used to adore going to the Manx GP because of all the old bikes. For someone who didn't 'get into' bikes until late 90's, some have said I'm odd because I love classics and vintage. But the looks, smell and sounds are amazing
Life is for living. Buy the shoes. Eat the cake. Ride the bikes. Just, ride the bikes!!
They are, and I would! It's not that unusual to require different carb settings on either cylinder. The only thing which 'connects' the two cylinders is the crank and the fuel pipe which connects to the two float bowls. Other than that, it's basically two singles in formation.
EDIT: Oh, and the ignition coils. There's one per cylinder, but they're in series and always fire together.
Mr. Dazzle wrote: ↑Tue Jul 26, 2022 10:41 am
They are, and I would! It's not that unusual to require different carb settings on either cylinder. The only thing which 'connects' the two cylinders is the crank and the fuel pipe which connects to the two float bowls. Other than that, it's basically two singles in formation.
EDIT: Oh, and the ignition coils. There's one per cylinder, but they're in series and always fire together.
Couldn't you get two really, REALLY long flexible probes and shove them as far up the zorsts as you could to get an accurate AFR reading? I'm guessing there aren't too much in the way of baffles to obstruct such a thing...
Welding a boss (or bosses) onto those headers would be a sin.
) to be sure you're not getting a mix of exhaust and outside air.
