just put in new plugs and check the colour on them after a good blast . they should be a nice tan colour or darker. if the colour is too light it means that you are burning too lean and you need to re jet. I put a mac on my 78 cb550k and did not need to jet. This does not mean you will not have to though. better to test than to be sorry later. If your bike has the stock air box and filter then I suspect you probobly don't need to. but do the test anyway.good luck ,Fergie.
