I went out riding with a friend mine that has a Raptor 660. I usually ride the dunes in SoCal or out to Ocotillo. I have owned the shee for almost 2 years. It has never failed me until yesterday. We were riding just outside of Green Valley, AZ(3200 ft above sea level). We were on an access road leading to the mountains. We were in 6th gear wide open for about 3-5 minutes(btw, we were dead even). We slowed down when car was approaching in the opposite direction(rolled off the throttle). Once the car passed, I downshifted to 5th and got back on the throttle and lost power. I could not hit the power band at all after that. There was nothing that I could hear that would indicate internal failure. The shee will start on 1-3 kicks, but has no power. I got towed back to our staging area and changed the plugs. That did not work. This is when I noticed that I was down a cylinder(right side). The bike has 20-30 hours on top end that was built at the time I got the bike by Yakkey Racing in Escondido, CA. I've read through the info here and will clean the carbs tomorrow. I do not know what size jets are in the carbs. The bike is stock except for the FMF Fatty's and K&N's on the carbs. It was rejetted when the pipes were added. Is there anything I should look into while I'm cleaning the carbs? If cleaning the carbs doesn't work, I will check compression. Is there a certain way I should check compression(ie warm or cold, # of kicks, brand of tester)? What would be a normal compression reading? I'm new to working on my own bike and any tips, tricks, or specs would be appreciated. Thanks
