1977XS360

Looks like an air leak might be the problem...how do I spray the inlets? Does that involve removing the carburetor?

You were right, the air is cooler out of one pipe until the engine starts idling at 3500 rpm, ie. the other cylinder starts firing. Any idea what could explain the high rpm while idling? I left the bike running for about 20 minutes thinking it might eventually go down but it didn't

Thanks for the response. When it first starts and rides poorly, there is still exhaust coming out of both pipes with equal strength. Would that happen if only one cylinder is firing?

My '77 xs360 idles normally when i first get it started but has very little torque/power when I ride. After about 20 mins of riding something happens, usually sounds like a large backfire, and the bike starts running very well with a lot more torque. However, when this happens the bike idles at about 3500 rpm. Any ideas what's going on here? I am a complete n00b, this is my first bike.

My '77 xs360 idles normally when i first get it started but has very little torque/power when i ride. After about 20 mins of riding something happens, usually sounds like a large backfire, and the bike starts running very well with about 3x more torque. However, when this happens the bike idles at about 3500 rpm. Any ideas what's going on here? I am a complete n00b, this is my first bike.