Anyone else ever have a problem with the bike stalling as you slowly release the clutch from a standing position in first gear. It also happens when down shifting into first gear. Its not constant but rather its an intermittent problem. The bike also backfire occasionally when engine is both hot or cold. I was thinking the stalling may be a faulty kick stand switch, or tight or loose clutch cable etc, the back fire possibly a vacuum leak, faulty plugs etc. Any input would help thank you