put the os 1.60 in it you wont be sorry a buddy of mine had a moki 1.35 in his cap and it did'nt have enough power. i got a os 1.60 in my 540 edge from h-9 with a jett in cowl muffler & a cline reg. and it works great.

just my 2 cents

also got a 1.60 in my h-9 cap 1/4 but have'nt flown yet maybe in april this mi weather SUCK'S