Good morning gents! My name is David, and I own a small town bike repair shop. Been in operation 13 years. I'm new to the forum, although I have used this forum as a guest and am amazed at the amount of knowledge on here. I've come to pick some brains because I have a bike that is thoroughly whooping me. Here's some background info. bike arrived firing on one cylinder. found the expected SVS
issue. Pulled both heads and did a valve job although I didn't ream the guides as that was before I was aware of the SVS problem. Replaced the piston rings since bike had 97k miles on it. Also found 3 of the 4 lifter plungers stuck. Replaced all 4 lifters. Bike has Kuryakyn Hyper charger and Vance and Hines long shot exhaust. Reassembled bike and it ran great for about 400 miles and then suddenly without warning started coughing so bad it blew the carb
off the intake. Installed leakdown tester and front cylinder shows a 4% drop and rear at 3% which is well in spec. Had not previously touched carb, but went to it next. Found accelerator pump clogged and binding and corrected that. Found the vacuum slide actually melted on back slide, replaced that. Cleaned all jets and passages. Checked vacuum diagpram for holes, removed intake, inspected for cracks and reinstalled with new o-rings, removed AIS
and plugged port on intake and the 2 lines to the heads. Verified idle screw was in far enough. Bike fires, idles rough for about 20 seconds and then blows carb off intake violently. any thoughts from you experienced Yamaha mechanics?? Any help is greatly appreciated!