nxrsr20- I wont shoot you down but to let everyone know the piece that joins air box is hollow and shares the internal void of the other 2 pipes, so it must do something? Its not unlike the y join coming back from the solenoids and that doesn't need any brace to support it- so it wouldn't be stuck in the air box just for that -not that I can see that it goes anywhere in the box either

Not sure what is does but used a 5mm garden sprinkers system T piece to fix it

anyway carbs etc are back on and it fired into life 1st kick (kick it over a few times with key in off position to get fuel down 1st)
No fire in right side cylinder (sorry to those who have read from the start but I am such a noob that in 1st post I said top cylinder -)
Spark is there when I pulled the plug and started it running on other cylinder.
Plug was very wet and still clean so there must be fuel
Next onto Andy's and Richg suggestion for tracking air leak-
If its not an air leak then what? compression test that cyclinder for busted /worn rings...


I have made no mention of it so far but just want to say I appreciate the replies and time spent replying so far!!
NSR-WORLD....rock on!!!!