While going down a big hill WOT....

gufazi /
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my moped likes to slow suddenly a few times for like a second or two (soft seizing?) when passing the 35 mph mark. It will also backfire on occasion during these hills.

Can someone tell me what causes this and if there is anything I can do to manage it with the mixture or idle screws?

The bike is an 08 Tomos Streetmate R with 500 miles. Recently added a biturbo, UNI filter and increased main and idle jet. It has done this on hills before and after the mods.

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