UPDATE !!
BAJA IS RUNNING AND TUNED THE BEST I CAN GET IT !
I got a repair kit and fitted the new gaskets and diaphragm. .
I also got a new isolator block ..new block to barrel gasket .. new carb to block gasket .. new primer bulb .. new fuel mix
It didn't start .. after a lot more looking and fidling I found the metering lever wasn't lifting the jet .. a slight adjustment and it poped with choke ..then choke off it fired first pull and ticked over .. still boggy .. 2 more metering lever adjustments and a while messing with H and L and it's now running sweet ..
H is at 1.1/4
L is at 1.1./8
I will take it to field tmorro and report back .. but for now I'm happy and it pulls from low rpm to high without bog
Plug is a good colour too so I know it's running pretty nice
Thank you all for the help and advice
Regards
Jeff