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You can look to see if the detent is working properly , as it could have popped out and is only giving tension one way ..... did you happen to jump or do something (crash) and jam the shifter down at any point ???? , do you know the history of the bike ?? , prior owner ?, raced ?,trail ridden ? , beat on it ? , crashed a lot ?? , it is possible that a fork is bent , but usually it happens in the higher gears when shifting without the clutch and banging the gears (which is fine by itself if done correctly) and the tranny being under load by not slightly letting off the gas when shifting to relieve the torque on the tranny , chain tight or not , that can cause issues ..... I would think a tight chain would cause more issues with the countershaft bearing before a shift fork .....
Usually a bent shift fork is caused by forceful pressure such as shifting under load , or falling on the shifter side and the shifter gets pushed beyond its limit , but that is usually up , not down ..... so not sure on that , but jumping and having your foot on the shifter and hitting the ground and jamming it into 1st gear would definitely do it .... or pounding the shifter down while coming into a corner , dropping from 3rd or 4th to first into a corner and just raising your foot and jamming it down for each gear hard while wheel hopping on breaking bumps into a corner , that is highly possible , but yea , looking at the clutch side detent will confirm if it is there or in the tranny (tranny means complete tear down)
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