morning, I've got a M50 suzuki. I noticed a really strange sound coming from it while riding home from work on friday night. sounded like a flat tyre. i stopped to check the tyre and it was fine. occasionally i also get a hollow whistling sound coming from it. i was checking the bike on saturday morning and touching each side of the motor (front and back). i realised that the back part of the engine heated up ALOT quicker then the front. and also the bottom exhaust pipe heated up alot faster then the top. i'm wondering if this is a problem and if the front cylinder is not firing properly?!?