I am thinking of making a plate to block the extra port off, and using a stock jug. Just for the sake of knowing, can someone provide me with a bore measurement and maybe a pic (intake side) of their 42cc engine. I am wanting to order the parts soon so I can test this engine out. It also looks like I need some new seals/bearings. I think that is what killed this engine. The seal started leaking due to crap building up on the seal and the engine injested dirt and other crap, scoring the jug all to hell. The piston is also scored, but I dont think its too serious.