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Originally Posted by Jasonx
Hey guys, I'm new here and I found you guys because I was searching for a answers to what happened to my bike.
My background: I just got into the sport and I bought a 95 500 off ebay and the owner put on a Yoshimura exhaust and bigger jets. I have put on about 2000 miles and the only problem I have ever had is a few backfires... not sure why. I use 87 gas and I only get about 40mpg and I'm not sure if thats normal with bigger jets or an indication of the problem I'm about to describe.
My problem: I'm not much of a mechanical guy so I really appreciate any help. I was driving home from work going 70 and all of a sudden I began to lose power and I thought I ran out of gas so I pulled over and checked everything out and it seemed fine. I could not start my bike without using a full choke and I've never had to use the choke before really. I managed to drive hom and do 30-50 but I hardly have any power, it drives rough and when I pull back on the throttle it doesn't do much. I pulled out the spark plugs and the ends were black so I put new ones in but I have the same problem. Rough idle, not much power and my exhaust note sounds raspy. I can start my bike and drive it, I managed to do about 70 on a little stretch but it just doesn't have consitant power and does not run well. Please Advise.
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Don't know for sure, but the black soot on the plugs signify that you're supposedly running rich, however, it could also mean that the electronic ignition could also be faulty. I'm assuming that this is a 4 cyclinder? Are all your plugs comming out the same, or is it limited to one or two? If it's like 1 and 4, or 2 and 3, it could signify that one of your coils could be faulty or just a loose connection. That would make your situation erratic.