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Drz400sm snatchy throttle/ momentary loss of spark?

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Hi guys,

I have this intermittent problem with my FCR equipped drz400sm.

When you start from stationary and when you change gears and get back on the gas the throttle get quite snatchy at times, almost like it loses spark for a second and then comes good. Adjusting the fuel screw does bugger all. It may improve for a while but then comes back, regardless of which way you adjust the mixture. I also notice that it is more prone to doing this on cooler or less humid days. Runs better the warmer or more humid it gets.

Stock TT store jetting, 3x3, rs2.

Any help appreciated.

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