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I recently started my 76 CB500T for the first time in years and Im getting a real nasty Idle. I figured a carb clening would do it but no luck.

As you can tell from the clip its a werid idle. I wasn't touching the throttle that was all the bike reving itself. One of cylinders is fine, the left side is the one with the erratic idle. I doubt its a back pressure issue seeing as both pipes are cut evenly but I wanted to make sure.

Do you guys think Im running the risk of a bent valve with poor back pressure?

Thanks!

http://media.putfile.com/CB500T-Exha...time-start-up-

404 not found on that clip

telefunkin wrote:404 not found on that clip

That would be because the url is incomplete...

By the time your pipes are as long as you've cut them back too it shouldn't matter too much. It's not totally a backpressure problem. You're going to need a rejet though, I'd also check the carb boots for leaks, and make sure that I actually cleaned and set the float heights on the carbs correctly.

I think the most likely culprit is a vacuum leak.