Last night I re-sync'd my carbs using the lashed up vacuum gauges as described on this board. It took me 2 weeks however to find somewhere that sold connectors for 5mm vinyl tubing.

Once I had all the stuff, it only took me an hour to lash up a back board on a plinth and tie the four separate pieces of tube to it with cable ties. I used windscreen washer fluid due to its nice "blue" color, and closeness to the density of water.

It then only took me a few minutes to get the fuel tank off and sit it sideways across the top of the air box. and a further hour to fine tune the vacuum levels. To start with there was a difference of approx 20cm between highest and lowest. This is now down to less than 1cm.

She now purrs.........



Now the worrying bit. When I had the bike running from cold with the fuel tank off, I noticed some arcing on the outside of the ignition coil (right side). This stopped when the engine warmed up a bit (20-30 seconds). Is this to be expected? If not, why is it happening?

Thanks

Carl

All your arcing should occur within the cylinder.

Simply put, the electric current is taking a short cut and jumping across a gap to complete a circuit.

The sparking is probabley occuring in part of the high voltage ignition circuitry.

What you have to do now is to clean all wiring and connections, everything should be dry, there shouldn't be any broken or frayed wiring. Make sure all your connections are pushed hard home.

I occasionally spray a bit of electrical solvent around the connections.


gg at bb, ava good day

[QUOTE]Originally posted by cscotson
[B]using the lashed up vacuum gauges as described on this board.

Do you mean the water-antifreeze manometer?

It took me 2 weeks however to find somewhere that sold connectors for 5mm vinyl tubing

You should have asked, I could have helped (others be advised)

It was no big deal, as the weather in Scotland for the last few weeks has been very bad (Gales, rain, snow....the usual), so the bikes being laid up anyway. My only modification to the design was to insert raw plugs into the tubes instead of the specified eraser/insulation wire dampers. This appeared to work pretty well.

Thanks anyway,

Carl