I checked the plugs were sparking ok, and two had poor sparks which didn't arc across, but only sparked around the bottom of the electrode.
I went and got new plugs and it didn't start so I started undoing the carb rubbers and noticed I hadn't tightened one up DOH.
I tightened them all up again and it fired straight away.
Thanks for the pic of throttle adjuster Neo. I found it but someone has sheared it off, all thats left is the thread pointing at the throttle cable holder, and can't get a tool on it. Now that its running well, its ticking over at 3.5k.
I think I'll get the carbs off again and check the pilots,and put a new throttle adjuster bolt in. I don't have any gauges to balance the carbs, maybe a future job.
Nearly there I think.
He did say that the revs not returning to idle quick enough is because there is something that slides, and normally with more power, ie without the restricters it would have enough pressure to return it although it was worn, and he said that it would return better when going down the gears to drag the revs down, but the carbs are old and worn and that's that.
I think you were spot on Neo. Air leak. And maybe he should of at least recommended an investigation of the carbs.

Sounds a bit of a ropey excuse but will never know..

Buggar about the idle adjuster.

Do you know how to balance the carbs with a drill bit? If your getting them off again you can get them very close by doing this method.

By adjusting the balance screws you will move the idle so you need to fix the adjuster. With the carbs off and no throttle cables it should be easier to get out, some pliets and un-scrwe it, perhaps it siezed which is why it snapped but i hvent some across a siezed one before.

Yep good clean up, compressed air helps blasting through the idle circut.. this is the 3 small holes you can see where the butterflies open and close.

Search on here for drill bit method and you will find a guide on how to get them balanced close enough for now.

Cheers I'll look for the thread.
I've got the carbs off and upside down, can only see two holes where the butterflys are, have I got nc21 carbs then or something else. I take it you mean when the carbs are upside down, you look down the holes to where the disce turn when you twist the throttle? Oh hang on, the really small holes, see them now I cleand the crap away from them.
I'm going to read up on carbs now so I don't become a nuisance asking questions all the time.

Ah crap, another question as i'm stumped as to where do the 3 holes by the butterflies lead to? do they lead to the larger hole above them. There's black crap around the 3 holes, and I'm thinking if I clean it off I'll rub the crap into the holes. I cleaned one and crapped myself thinking Iv'e crapped up the holes. I need it running in the morning. Its not all crap though. jeez, how many times can I say crap? Its friday night, I should be out trying to get laid.

Erm, it sounds like your carbs are full of crap and need cleaning.

I am trying. but don't want to make them worse as I need to run it in the morning. Any idea where the 3 holes lead to? please.
I don't want to just leech from the site, but at the moment I'm only 18 now and will try to contribute in future.

128bhp wrote: I don't want to just leech from the site, but at the moment I'm only 18 now and will try to contribute in future.

Good attitude to have

Don't worry, it's taken me a while to learn enough to be able to help others!

Sorry to keep pusshing this to the top, but where do the 3 holes by the butterflies lead to? I'm in the garage with the laptop. help please.

The three holes are where the fuel/air mixture enters the inlet tract for the cylinder. So, unless I'm mistaken, one goes back to the main jet, one goes back to the pilot jet, and the other goes back to the air screw. If they've got crap in/on/around them, the bike will run poorly, as the mixture will be affected. It'll be more noticable the smaller the throttle opening you use, so idle is probably going to be worse affected. You might get away with running some carb cleaner in the petrol, but really it sounds like proper cleaning is needed.

nice one..thanks.
So it seems I have to have the carbs down to their total individual pieces to totally get my head round them.
I couldn't tonight . I gave up at 11pm and put them back together so I could be on the road tomorrow.
There coming apart again tomo night. Bring it.