ok so i probably should have used the word "vibration" instead of 'shuddering'.
Anywho, i have since given myself a list of possibles and will also double check with a certified mechanic tomorrow.
1 - ECU problem, connection of wires etc?? highly likely, but's it's dark now so checking will have to wait until morning.
2 - Engine mounting bolts - again highly likely
3 - Chain/Drive chain - Sprocket setting - unlikely given there has been a new chain fitted less than 200kms ago.
So now that i've listed those 3 options, which one seems more likley base on vibration from acceleration. There is no vibration when sitting idle, only through acceleration.