TOPIC:

Pete,

The Colourtune Plug will tell you all you need to know.

You mentioned earlier in the thread that you have one.............just use that & turn mixture screw out in 1/4 turns every 3 minutes of running until the cylinder fires up.

If you need to go more than 5.5 turns then the circuit is probably blocked.

Try removing screw altogether & look at the diameter of the screw tip & get some copper wire the same diameter as tip & push it down the hole to make sure its not blocked at the bottom where it enters the venturi / throat.

Pete F

strate6
thanks for the mixture screw settings
i set mine to standard as in the book 1-3/4 turns and then started the bike for the first
time after the rebuild, nearly suffocated with all the fumes.
i checked the settings to be sure, but then i found your post on this forum.
so back down the shed armed with small screwdriver and reset all the mixtures to 3-1/2 turns
and what a transformation, after a small bit of adjustment by ear the engine is sweet.
unfortunately this has revealed a new problem, the temp gauge goes to the red line and the rad is still cold. thermostat buggered.....
at least its running nice now. ill do a colour tune when the stats sorted.
Thanks
Ian

Ian,

Great news mate.......pleased you are getting there eventually.

Keep us updated on how it goes.

P.S. Its also really really wet up here in Northumberland but you guys in the South of the Uk seem to be getting more rain than anyone.

ROLL ON SPRING !!!!

Pete F
Uk

1 main jet ? per carb?

strate6 wrote: Pete,

You definitely have 5 running well judging by the photo.!!
What is interesting is that only 1 plug is not ok.

As its only 1 cylinder it MUST be a problem with the following on that cylinder only.

Plug.
Plug Lead.
Compression on that cylinder (valves or rings).
Mixture screw issue on cylinder 1 0nly.

As it shares a carb with cylinder 2 & the carb only has 1 main jet, a fuel problem would affect both cylinders, not just 1 as it feeds them both equal quantities of fuel.
Maybe a good idea is to turn the mixture screw IN on that cylinder by 1/2 a turn & try from there.

My 6 mixture screws vary from 3.5 to 4.5 turns OUT once set up with a Gunsons Colourtune Plug so it maybe just fine adjustment you need.?

Pete F