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2013+ Daytona 675R 12k-ish miles
Bazzaz QS
Attack Performance rear sets
GP shift
Track bike (only)
Just did an oil change before the last track day. Oil was still in pretty good visual condition. Didn't notice any obvious metal bits when I drained it.

On the straights under wide open throttle I'm missing shifts between 3rd and 4th gear. It will fall into neutral (between 3/4). I'm using the same amount of firm shift lever pressure that I've been using for the 3 years I've had the bike. Thought for a minute maybe I was being too gentle but even being really firm created the same result. The only exception being that it sometimes "clunked" and actually grabbed 5th gear

I retightened all the linkage and everything feels nice and snug. No slop in the shift lever action.

Talked with Bazzaz and they didn't seem to think it was a QS issue.

I'm getting ready to open up the clutch side and visually inspect things.

Anything in particular (besides big chunks of metal) I should be looking for or looking at?

Is this a common issue with a common fix?

Special tools needed?

I have fairly good mechanical skills and room to work so I'd like to tackle this myself if possible. My Triumph mechanic is dealing with a shoulder surgery and won't be able to look at it for at least a few months.
 

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There was a star shift update. I had 2 2014 Daytona’s and one had it done right away the other was the wife’s and I never rode it till last year. Once I changed that no issue with shifting at wide open throttle.


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Had exact same issue on my 15 with 11k on the clock. it’s not a QS issue. On my bike it turned out to be the detent wheel which had worn/rounded edges on it. The dealer decided to change the selector arms, drum and shaft while it was open with the updated parts but the cause seems to have been a worn detent wheel.

A friend who raced his bike said they kept a few extras handy because the detent wheels would either wear down or break the teeth on it.
 
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