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Bought new race-driven 520X86L non o ring chain with 12T front and 36T rear sprockets...got it all put together on bike and chain has like 2 inch sag...any ideas on what to do to make up the slack..I loosened the slack adjuster on rear axle and turn it only to make slack even more..I'm baffled
 

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Is that stock gearing? If not you may have to take a link out. Best way i have found is a bench grinder. Grind the end of the pin until the plates can be removed. Then put your master link in.
 

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Ive never had any luck with chain breakers. I just grind the pin. It takes 10 seconds and dosnt require any effort. But glad to help!
 

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12 being 1 tooth lower then stock is equivalent to 5 teeth on the rear. You will get a noticable gain it torque. But lose topend. Which IMO is where the 300ex really struggles is topend already. Then you went 2 more teeth down on the rear which counteracts some of the front gear change. So it may be really good in the long run. I gave up on my 300ex when i did a 330, stage 2 web cam, and full pipe. P&P on the head with a 11:1 piston and i got walked by my buddies bone stock 400ex. Its like 2 entirely different worlds.
 
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