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I did not mean to use and abuse and yes I am sure you will as I am also the proud owner of a 2009 yamaha yfz450r I really do appreciate the help thanks

Well I just rode it about 3 miles and it got better and better and better every time I rapped it out it was cleaner and that was my first time riding a street bike but it screams between 8500-10,000 now for sale before i hurt myself cheers to all and thanks again

No 7 hours south from chicago I am at the very bottom of the state. But the bike just ran excellent it even idled better gonna let it run for a couple twenty minutes and see if it stays on all 4 cylinders Thanks a bunch guys

Thanks guys. no it has not been cut there was alittle crust in there i cleaned it out and shot with wd40 havent started it yet waiting on some gas. I am about to start messing with it again today.. I am located in Southern Illinois US....

cleaned carbs changed plugs drained old gas and put new started it it ran good for a minute or so then started dropping cylinders but 5 minutes later when I go to start it after i mess with the connection to the ignition box and the connectors for the coils it runs on all 4 again and will do the same thing. sometimes It will crank and crank and crank and just backfire and not start at all

Thank you very much for you reply's I have to get some gas in the bike before I can tinker on it anymore. then will update with what I find.. Out of curiosity what is a 88 fz600 with 8000miles on it in mint condition worth if it ever runs I was thinking 1200-1500 am I off?

I can try that Do you mean the swap the connectors that come from the top of the coils or just swap the plug wires around??it is not always the same 2 cylinders but for the most part it is cylinder 2 and 3 and sometimes hey all fire and it runs good must be something small I am just missing it.

Excuse my ignorance but what is a "knackered" coil? Is there anyway I can fix this problem relatively cheap??

indeed I did look there.. All I found was a lighter that doesnt work and a empty pack of smokes... and the bike still doesnt run good lol .... but on a serious note any suggestions as to what could be going on with thing?

I bought this bike awhile back and have never gotten it to run right sometimes it will fire right up and hit on all 4 and some time it runs on 2 cylenders sometimes it wont run at all I did some reading on here and unplugged cleaned and plugged back in the connections from the coil it seemed to help for about a minute then it went back to its old ways. I also unplugged the connections for the Ignition box under the tank and when I plugged it back in it was better to but always goes back to running like crap any suggestions or advise would be greatly appreciated thanks