A certain amount of lumpyness has been cured by reprogramming the gas ECU so its default stepper point isn't 255.

This has also brought the fuel consumption back to about normal ;-)

I haven't reset the adaptives, I'll need to get a shot of some diagnostic equipment to do that.

Surely the trims being wonky wouldn't make it misfire on gas?

There aren't any fault codes stored. It's particularly stumbly and rough on petrol, but mostly runs okay on gas. On petrol it's often pretty lumpy accelerating away - on something with a carb I'd say it felt like the accelerator pump jet was blocked, it feels like it leans out massively as you go from idle to about quarter throttle.

It's single-point gas, which is set up pretty much correctly (it's maybe a little rich).

My old beast has a bit of a misfire and is down on power. The plugs are getting a bit old but I recently checked and set the gaps down to 0.7mm and I stuck on some new Intermotor plug leads (the Magnecores it had were falling apart).

Is there any way to check if the coil itself is failing, or do you just test by substitution? Also, is there anything that actually fails over time in spark plugs apart from the gap opening up?

Hi! Good to see you here :-)

We have a lot of mercury tilt switch relays in our stations, old BT ones for firing the station bells when the backup phone goes. They use one of those tall skinny BT relays on its side in a heavy cast box, with a pushrod going up through a barrier to a "seesaw" with a vial of mercury that rocks backwards and forwards. I'll post up a video later when I can get it off my phone.

Bronze from the water pump pulley?

I've only ever heard bad things about polybushes on radius arms, and having driven a friend's father's polybushed P38 before and after fitting genuine LR bushes, I'm inclined to agree.

Check you've got the valve base screws in the right way. That looks like something has stopped the valve body from going all the way down when the screw was tightened.

That was all on LPG too when all the naysayers will tell you it'll ruin your engine as it burns hotter than petrol

It burns hotter than petrol but that's more than taken care of by the amount of heat dissipated boiling off the LPG in the vapouriser, surely?

Billy Connolly used to go climbing with my dad, who taught him how to play a bunch of folk songs on the guitar in the Clachaig in Glencoe ;-)

I'm struggling to see how the solenoid failing could get the diaphragm to stick shut, unless it's actually the valve significantly leaking air past the seat.

It's actually not too bad, but I swapped back to halogens for the MOT for the sake of a quiet life. I'd like to get a shot of a proper beam setter to check them for myself.

It's surprising how well they handle when there isn't six inches of play in every joint ;-)

I wonder if 255% is that it's wrapped around to -1% position?

I found I couldn't get the rear bags out of mine no matter what I tried to lever them out with so I drilled two 8mm holes, one above each bag top, and knocked them out with a drift. The front bags took about 25 minutes all in, 10 minutes of which was trying to work out how to align the pin correctly in the gap in the mounting.

You could fit a pneumatically operated ramp off the air tank. Watch the ram pressure and leverage though, in case you end up with it working more like a pinball flipper ;-)

If it's finding it easier to get into the rear bags than out the exhaust, you probably have a problem somewhere. Possibly a combination of the exhaust valve and non-return valves?

Shouldn't be a browser thing since the post order is determined by the way the server looks at the database. If you've got really odd stuff happening, please screenshot it and email it to me.

The posts are ordered with stickies at the top, and in order of date of last post.

Good shout, I might take you up on that. I'm going to phone round a couple of places in the morning.