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Sure, cables always start stretching just before they snap, as one strand at time breaks and unravels. But is could also be a lack of oil in the transmission, friction material coming loose from previous slippage and binding, etc. You say the adjustment is ok, but how much freeplay does it have?
Your gun needs a good cleaning with some solvent and a small brush. After cleaning it blow it out and put some light oil into the housing where the pin through the trigger is and work it back and forth a few times. It should free up then. Hope this helps you...
HELLO;Im assumeing that both have several hours on them,if so it possibly could be your rings and or the fuel mix your useing. Try and reajust your carbs. ( process of alimination), then run them and see if there is any change. If not, get a hold of me if you would like and we can try some thing else. firstname.lastname@example.org.
lean gas mixture. or the valve timing is off, but probably both. A lean mix will run really hot and allow for secondary combustion in the pipes (backfire) when the valves let even a bit of uncombusted gas through. My guess is that the bike hasn't had the carbs cleaned out thoroughly in a while. Run a half can of Sea Foam with your full tank of gas to help clean out the carbs, but really you should take them apart and dip them to clean everything out. Also you could adjust your pilot screw settings to make it run a bit more rich, but then you are just compensating for the dirty carbs. That's just my guess.
sounds like your mix is off and it's fowling the plugs. probably too rich. make sure the level in your carb bowls isn't too high. Really sounds like you should clean and bench set your carbs. Especially if a plug change helps but doesn't last, then it's got to be your fuel mix, or maybe timing.