Both bikes behave same way because same person has been messing with them using non-effective troubleshooting and improper repair techniques.
All information you need to finish this has already been posted. You just don't want to properly troubleshoot and measure, which is preventing us from getting proper data to analyse and thus prolonging time to resolution.
Again, this is 5-minute repair procedure. I've wasted enough time posting same thing over and over again. Goodbye.
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