ORIGINAL: michaelchow

Sir.

I think you bought a GT35 which is with side-exhaust, the converting is easy, please try to do carefully.
1. research the GT35 with the manual and explorded views.
2. disassemble your GT35, remember the situations of some parts which need to change.
3. take the Ring installed on the extra Rear-pinston, and inside the cyliner-liner
4. rotate the cylinder-head and cylinder-liner with 90 degrees.
5. reassemble it. it is GT35R with rear-exhaust.
6. please do it carfully and think it with all parts are correct situations.

NGH gas engine is with classical glow engine style, each size is with sleeve inside for long time works, so All NGH gas engine is any more heavy than others which many by plated-head gas engine.
Flyers will use NGH gas engine well if he has experience with glow engine ever.

You can use same rate for fuel and oil mixture with 30:1 or 35:1. no problem.

I suggest you fly your GT35 first and later you can try to convert it to GT35R.

thank you sir.

michael