The wife's 93 B4 is hard to start and it's getting worse. It has a Yosh can on it. When she got the bike, it would start right up when cold, now, you have to crank it for a while, let it sit, thatn crank it about 6 revolutions before it will start. It doen't appear to be a spark issue. Could it be that the carbs are getting blockage in the fual passages. I'm not affraid to tear carbs apart to clean them, but I prefer not to. Any advice would be well appreciated.