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2014 yz250f hard to start

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I just installed and shimmed new intake valves because the bike was hard to start and the valves were wearing out. Go out for my first ride and it was still a pain to start. Just tried to start it again and was about 20 kicks to get it started. What could be making it so hard to start? Cant be the valves, piston is still fresh so it cant be compression, could it be clogged injectors? I winterized it last year with fuel stabilizer and made sure it got all the way through the fuel system and drained it before I ran it this year. Thanks.

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