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Message: [QUOTE="Jasle, post: 983241, member: 26675"] typically the big bores pull more vaccuum and pull more fuel too. I've had to go down in jets with big bores. I'd check the carb as mentioned then I'd go for an air leak...especially since you were working on the bike. broken reeds typically make it hard to start and take away bottom end power. I've not seen one cause a high idle situation. Squirt some carb cleaner around the intake and reeds. Then at the bottom of your clyinder. Since you just dropped a cylinder on i'd guess it has the leak there. Did you use some type of sealant on the gasket. #4yamabond??? I have found about 90% of the problems that come in after someone else has worked on the bike are caused by the work done on the bike...so start looking at whatever you just did to the bike...topend! [/QUOTE]