Loss of power and Change in Tone

jthiessen

XS400 Addict
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British Columbia, Canada
For the last few rides I've done, my bike will spontaneously lose power and the motor will almost drop an octave in tone. I also get some smoke out of the right exhaust.

In the past the issue resolved itself.

With clutch in I could get the RPM to 7k, but when I start moving with WOT it drops to 2k and the bike crawls very slowly then builds up to 40 km/hr (way too slow for the roads I was on).

I can keep the bike running, but it would stall if I don't give it a bit of fuel...

Any Ideas?
 
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