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Slow in all gears especially 5th

Hi all I have a 07 Yamaha XVS 650 with new clutch plates, plugs, clean carbs, oil ,gear oil ,also sync the carbs, clean fuel tank and filter, fuel pump is good , first gear ok secound ok third could be better sluggish more throttle or gas that movement fifth nwill switch into but no opower bad on hills 70 mph max on interstate. The front cylinder is warmer that the back  200 deg back 70 front  the PSI on exhaust low and high could one cylinder not be firering as much as the front ? 

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Sure could. My first suspect would be the coil.
https://www.manualslib.com/manual/833178/Yamaha-Xvs650.html?page=1#manual
Chapter 7, page 8.

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