There were several parts updates for these bikes. If the bike does not have them, it is going to need them. Cam wear is also an issue along with the shim buckets. You have to use the efi software including the exhaust gas analyzer to properly set up the efi. If the motor is complete, I would part it out and move on. Even if you do get it running well it won't last long term. I had an 03. They are a very fun bike, but very expensive to keep running.
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2018 EC 300
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