Today i acquired a 4 hp easy spin motor which has never been used. It has never had oil or petrol in it. The choke is stuck but will probably move once i spray it with carby cleaner. I paid $80 for it. The airfilter is missing but the carby opening has been tapped. There is surface rust inside the petrol tank. It is in good nick. The code appears to be 7091304 so l believe it was built 13th july 1970. The other numbers are 00232 0556 01. Numbers are hard to read as there is surface rust. I have never seen a yellow motor before , has the colour got something to do with hp size or equipment use. Any tips on how to prepare this motor before i fire it up. It is going on a rover cylinder mower.