First time poster, so I'm looking forward to seeing some good replies (which seem prevalent throughout the forums).
I'm currently working on a 2000 Katana 600, here's the breakdown of parts replaced and procedures performed to this point. New battery installed, and voltage tests confirm alternator works properly. Rebuilt carbs (bench synched) installed. I have also double checked jet size, placement and cleanliness, all good. Existing K&N air filter, cleaned and visually inspected. Checked all lines (fuel and air) for cracking or misplacement. Ignition system tested and working properly. Ohmeter test of TPS reads within limits.
Now, here's where the problem is. Bike has poor acceleration and you can hear it *popping* out of the exhaust on initial startup. Also, it is impossible to redline it. Once bike is running for about 10 minutes at operating temperature the *popping* stops, and there is a noticeable difference in exhaust temperature coming out of the pipe. At this point you can redline the bike, but with a horrible lag at 4-7K RPM. Tried to sync the carbs today after warmup and the needle was all over the place at idle. It was still erratic at high speed idle (2-3K RPM), and the value dropped at 4-5K.
I'm really looking for a confirmation of my current troubleshooting. My conclusion to this point is that the valve seats are toast and I'm stuck doing a top end rebuild . I considered the possibility of a warped head or blown head gasket, but I've never had one act "better" after running at operating temperature. Usually just the opposite.
If I'm ignorant, help me. If I'm stupid, shoot me. Thanks!
I'm currently working on a 2000 Katana 600, here's the breakdown of parts replaced and procedures performed to this point. New battery installed, and voltage tests confirm alternator works properly. Rebuilt carbs (bench synched) installed. I have also double checked jet size, placement and cleanliness, all good. Existing K&N air filter, cleaned and visually inspected. Checked all lines (fuel and air) for cracking or misplacement. Ignition system tested and working properly. Ohmeter test of TPS reads within limits.
Now, here's where the problem is. Bike has poor acceleration and you can hear it *popping* out of the exhaust on initial startup. Also, it is impossible to redline it. Once bike is running for about 10 minutes at operating temperature the *popping* stops, and there is a noticeable difference in exhaust temperature coming out of the pipe. At this point you can redline the bike, but with a horrible lag at 4-7K RPM. Tried to sync the carbs today after warmup and the needle was all over the place at idle. It was still erratic at high speed idle (2-3K RPM), and the value dropped at 4-5K.
I'm really looking for a confirmation of my current troubleshooting. My conclusion to this point is that the valve seats are toast and I'm stuck doing a top end rebuild . I considered the possibility of a warped head or blown head gasket, but I've never had one act "better" after running at operating temperature. Usually just the opposite.
If I'm ignorant, help me. If I'm stupid, shoot me. Thanks!
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