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Yz 250 bog

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Afternoon from south africa,


Im having a bit of an issue on my 2010 yz 250

Bought new and always used the same guy to service it but moved far away so had to take it somewhere else.


My 5th gear was jumping out under load so we took the engine out and replaced 4 and 5. Problem sorted.


Now for the first time in 8 years im having an issue where it starts bogging just before hitting the powerband and also 3 times in 50+ starts the kick start didnt want to go down, push the bike a bit then i can kick again.


Piston and rings were done about 20 hours before the gearbox started and looked pristine once the engine was out. Has compression.


Not sure where to start with fault finding.


Thanks for any help

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