My son damaged his 04 blaster engine beyond repair. I have purchased an 03 engine and after I have replaced the top with the modified one I have noticed that there is no magneto or strater what ever you call it on the engine. Can I use a 04 cdi setup on a 03 engine. The company I have purchased the engine from are sending me over the part for the 03 engine, will it work or do I need to change the cdi aswell.