Here are the LSG-27 engine rules. They are the same for LSG-36 except the displacement of course is 36
A. General engine rules for LSG 27 classes
LSG27 Up to 1.647 cid maximum (27.0 cc maximum)
1. Maximum displacement will not exceed 27.0 cc.
2. All engines must have a canister muffler, tuned pipe, or custom exhaust that meets the
current IMPBA db levels (as per section K-4 of the IMPBA Technical Standards).
3. All 2 cycle engines must be naturally aspirated.
4. All 4 cycle engines must be naturally aspirated.
5. Internal and external modifications may be made to the engines major and minor
components.
6. Single piece cylinders or cylinders with removable head buttons are allowed.
7. Major and minor parts from secondary manufacturers may be used.
8. The engine must use spark ignition. No glow plug or compression induced combustion
allowed.
9. Each engine must have a working throttle control and the engine must be set up to be completely stopped with the transmitter controls.
10. Any size or brand name carburetor may be used.
11. Pull start or belt/pulley start are acceptable methods of starting the engine