Hi Plain Old Iron,
At the end of the day you can get this running perfectly as it is already a runner even though only for a second or so. That proves it will run. The issue is the carby and I usually don't bother with all the rubbish shown on utube, I have my own carby modifications that I know work, bit of work involved but I have done hundreds of them and they are pretty reliable, very few of them ever come back with a problem
