My brother picked up a cheap motorcycle ("not running") a while back and has had some time to play with it over the long weekend. It's a Honda VF400F, with a 400cc V4 engine and was made in 1983. Using a can of Nulon Start Ya Bastard, he got it ticking over but it makes a horrible noise (he thinks from one of the 4 cylinders in particular). Exhaust gasses come from both exhaust pipes. Click here to listen to the 34-second soundbyte. The engine actually starts at 24 seconds so you get about 9 seconds of running to listen to. If anyone has an opinion on what that noise might indicate, I'd be all ears. I thought I might post this both here and also on the OCAU motoring forum as I was hoping to get a handful of responses from the gifted people on both forums coming from different motoring backgrounds. Thanks for your thoughts, guys, I really appreciate your time.