Can't be much help regarding the struts, as I installed the stock gear and beefed them up by sandwiching wood between the fore and aft sections. Engine wise though, I dropped in a Super Tiger G2300. It is a nice fit, dummy engine and all, and the balance is right on the 2 3/4 mark. I know from experience that the MVVS 26 IFS is interchangeable with the ST G2300 and the OS 1.20 four stroke engine mount. The MVVS gasser is a great little engine and the weight difference is of little concern and will easily fit under the cowl. I am not sure about the 70 deg. pipe pitts muffler for the MVVS but Bisson makes it for the ST G2300.

If you are leary about purchasing the G2300, don't be. With the stock carb, you simply break in the motor as per instructions. After that, you first find the high end peak by leaving your glow driver connected, lean it until it starts to sag, and back off t he needle about an 1/8 of a turn. Next, you find the lowest idle poin, again leaving the glow driver connected. Then, disconnect the glow driver and listen for the rpm's to drop at this idle setting. This will indicate that you will need to lean the low end a tad more. Continue doing this until the drop in rpm is almost undectable. Next, set the mid-range. The mid-range setting will undoubtably be a bit rich. To lean the mid-range you will loosen the fuel nipple housing screws after scratching a mark to denote its original location, and then turn the unit counter clockwise 1/16 turn at a time, until the rapid advance of the throttle develops a smooth transition.

I have four of these engines and each one is a little different in that one mid-range adjustment may require more movement on the nipple housing than another. I think what throws many guys is the fact that the high-end is not as sensitive as other makes of engines. Also, a couple of my engines have developed air leaks between the carb housing and carb neck. If you can't seem to seal this area, the Perry carbs (non-pumped version from Tower Hobbies) have worked beautifully. They offer more sensitivity to the high-end needle setting as well. Hope this was helpful.