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Crf450r 2003 cutting out top end?

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Hey guys was wondering if you could help me, I have bought a 2003 450r supermoto converted. It had been garaged for a few years and when I got it it would run all lumpy. So I put a crab cleaner through it a new filter fresh fuel and a spark plug. It has started to run better but On a short motorway run at 70mph after a minute or so it will start spluttering as if I'm on and off the throttle, even when you drop it down a gear and when you pull over it just cuts out. Was wondering if it would be a carb issue or maybe a bad ignition coil or something? Thanks.

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I would pull the pilot and main jet ...just get new ones and see how it runs. I would bet gas was left in it at some point.

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Thanks guys for the replies, sorry about the late reply been trying out a few things, as to now it's had a full carb strip and clean, new stator and pickup a new ignition coil and even tried a new cdi that I knew was working. But I still have the same issue its been on the dyno and when you hold mid throttle it's as if it has a slight misfire but on the road it's fine any suggestions? Thanks

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Hmm....sounds dumb.... But I might check to make sure your kill switch isn't bad or shorting. Take it back to the simple things first.

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Could be a good idea as it has been changed to a pull cord switch but it happens at nearly the exact same distance every time as if something is getting hot and overheating.

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That's been checked and there's nothing wrong there so I'm assuming last thing is the wiring loom??

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Hmmm......ya know....did ya check the fuel filter in the tank...by the petcock? I had a YZ 80 when I was a kid that had some dirt in the tank. After bout 5 min it would just bog and die...due to clocked fuel filter (petcock). Wait a few min, it would start back up and repeat the cycle. This was when it was new from dealer! Once I got tank clean....end of prob. Might be worth a look....

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Not sure...I'm just throwing that out there as a previous experience......

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