SilverComet,

I had the Ti Jai 40 with a YS 63 in it. Flies very true and accurate, a lot bigger than it is if you follow what I mean. It was not twitchy at all. The build quality is very high. But the retracts are a little vulnerable though and therefore I would recommend a fixed gear set-up.

The YS 63 is I guess the most user friendly of the YS range. I have 3 63s and none have required attention. You will need to keep the nitro content up to 20% to get the best out of them. I used all the standard tank that came in the Ti Jai, but put the tank on the cog. The use of 20 and 30% nitro I found a little daunting and first. The cost of the fuel compared to 10% I was using in 2 strokes. But with throttle control the YS 63 is very fuel efficient. I have a seduction freestyle with 8oz tank. After 9 to 10 mins of flight I usually land and I will only use 2/3 of the tank. The YS will also just keep pulling the plane around almost any Manoeuvre, you will have fly one to realise the diffrance. You will also get large amounts of braking on the down lines and for landing. A 2 stroke will not give you this.

If you go down the 2-stroke route and change for the YS later, the engine mounts are the same size at a 46. I have a Znline madness. This had an OS 46 fx in sidewinder position. When I changed for the YS all that needed changing was the push rod for the throttle and drilled two more holes in the mount for the bolts. In side winder config the little stubby pipe fits directly under the fuz and troughs most of the cack off the plane.

Any way good luck

Kris