Is this a single or a twin? I bought a nib twin from the hobby shop last week and its been nothing but problems. .Bad reeds. Cylinder bolts sucking air.Timing was off ..I finally made block off plates for the exhaust and intake so i could check for air leaks..It leaked everywhere..Front seal, Base gaskets Reed block .After new gaskets and such it runs but idles is horrible.I guess i need a new front bearing too.Oh and one of the spark plug mating surfaces is so porous the plug gasket wont seal.But on a good note is has lots of compression lol