Have a look at Newark Autojumble this coming sunday,(15th Nov).
Nine times out of ten there will be a few machines there ideal for Mablethorpe.
The jumble is held on the Newark showground and is easily reached off the A1 or A17.
I did a couple of seasons at Mablethorpe on a 250cc grass tracker and later on a cut down BSA C15 road bike.Enormous fun and dirt cheap racing.I still go and watch there from time to time.