ORIGINAL: ThumbSkull
The ONLY gas engine I'd ever consider for a MOJO 60 is a DLE20.
It is the only one with anywhere near the right HP/weight ratio that I've heard of.
The problem with the DLE20 is the throttle is real touchy near the low-mid range and may
cause problems keeping a hover stable.
I have no experience with that JBA15 but if it's under 24oz with ignition and muffler and
has enough power to spin a 15x6 MAS-S2 at 9500+RPM then it might work.
I still wouldn't do it. Saito 100 is proven to be the perfect combo.
+1
If you really want to go gas on them, it is well worthwhile using an IBEC and reducing the weight of the additional battery for the ignition. The DLE 20 is better suited to the MoJo 65 than the MoJo 60. The BME 0.90 (Supertigre Conversion) gasser and the JBA 15 are the only 15cc's worth considering but neither really has the throttle curve to suit DOD flying. You would need to prop them to hover in the upper half of the rev range if you want to get daring. (and once you have flown a MoJo - you will want to get daring
).
As Thumbskull mentioned - the Saito 1.00 is a perfect combo for the 60. Match it to an APC 15/4W prop and go enjoy.
With the larger tube in them now, they must be as near as damnit to impossible to break - Mine is an older one and it has been to hell and back.