Bike sat at a shop for a year and clogged the gas tank and carbs. Shop mech could not get the carbs clean or at least not to where the bike would run smooth. Will a set of 91 carbs fit on the 89? Thinking I need to replace them rather tan mess with it. Any help? What is best? Here is what was done so far: honda mech cleaned carbs twice (got worse rather than better), cleaned gas tank, used sea foam on 1/2 tank (no luck) now bike won't even start.