Looking for the flex Pipes for the Saito 57 Twin.

I think if you call Horizon and ask they might tell you that the FG-61 pipes thread into the exhaust ports of the FG-57. They are currently in stock but ouch! The price...

Thanks

I think I have a set. I'll check tonight.

Why my Saito 57cc fourstroke missfire at low RPM?

Probably because these engines sometimes come with retarded ignition timing. The Saito FG 57cc should spin a 22 X 10 propeller with good authority and good throttle response. If not...
try advancing the ingition timing slightly and see if the symptoms improve.
Also, the symptoms described might indicate a rich fuel condition caused by the lower needle needing to be closed about an 1/16th turn.
Please private message me your email and I will send you some very informative tips. I already have them written up to help fellow modelers.