[scarletboa]

no you do not. they are a direct drop-in. they mount exactly like the stock engine. i would recommend the LRP .30 over the picco in your case. the LRP makes just as much power with a little less RPMs than the picco, but the LRP engines do not have air leaks that have to be sealed like the picco engines. they also have very nice carburators and are super easy to tune. i would get the LRP as well if i had to choose between the two. the picco is more for very experienced tuners that don't mind chasing a tune for half a gallon of fuel.