GS1OOO misfire and blue smoke

[ozzydog]

Geoff, as the smoke disappeared when the motor warned up it really points to the valve stem oil seals getting tired - they go hard with age and only make a decent seal once they have warmed up and become a bit softer. You can run the bike like this and you won't do any real harm (though the top end will obviously carbon up more quickly and you'll use oil). It's an easy job to cure and the parts will only cost you around £60 all in.

The bike running like it did and now not starting looks, as you suspect, like the carbs. Rather than fannying around the only definite cure is to remove and clean - really, really clean - and set up as per the manual. You'll almost certainly need the O rings for the rebuild but they are peanuts.

Plus check those valve clearances.

Hi there, well I'm gonna bite the bullet and order an O ring set and follow the guide in the link to clean them good and proper. Even if it doesn't end up solving the running problems I guess they are 30 years old now and a long way past their best and it can only make things better. I will be glad if its only the valve stem oil seals and shims that need doing, I had been worrying it would need a rebore etc as I have no idea how genuine the mileage is, for all I know it might be 32,000 round the clock. I was just gonna use it for the run this weekend and then get stuck into it but I guess it never pays to make plans
Thanks again for the advise
Cheers
Geoff