I cut the original pipes off just before they merged into the run back to the muffler and I love the sound. I am in the process of tuning the carbs and I'm a "rideable" state but I'm somewhere between to rich and to lean with the fuel to air mix and i cant seem to get it right. I bought a gunoson color tune kit to help me get it dialed but i have some other questions.
1) When riding in any gear my tachometer doesn't go above 4k rpm and adding throttle doesn't change RPM or rate of acceleration. Is this an exhaust back pressure issue or a tuning issue? Or something else entirely?
2) Do i need to lengthen the exhaust back to OEM length to regain the RPM range or does the open header reduce the rpm range that drastically?
3)On deceleration the engine is backfiring but seems to be localized to a single cylinder, is this indicative of a different issue or would tuning resolve that?
4)I resynced the carbs when i put everything back together but i cant seem to find a good resource that shows what the vacuum pressure is supposed to read for my year bike is there a specification noted somewhere or is it just balance what the gauge says between all 4 and move on?
Apologies for the long post I'm new to modifying motorcycles, especially vintage motors and such. Any advise would be greatly appreciated.
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