RE: Central NEW YORK boaters
This is directly from the rulebook:
General Engine Rules for the IMPBA Large Scale Gasoline Engine Classes
LSG27 Up to 1.647 cid maximum (27.0 cc maximum)
The gasoline LSG engine classes shall be divided into two classes, distinguished by maximum displacement.
LSG27
Maximum displacement will not exceed 27.0 cc.
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).
All 2 cycle engines must be naturally aspirated.
All 4 cycle engines must be naturally aspirated.
Internal and external modifications may be made to the engines major and minor
components.
Single piece cylinders or cylinders with removable head buttons are allowed.
Major and minor parts from secondary manufacturers may be used.
The engine must use spark ignition. No glow plug or compression induced combustion
allowed.
Each engine must have a working throttle control and the engine must be set up to be
Completely stopped with the transmitter controls.
Any size or brand name carburetor may be used.
Pull start or belt/pulley start are acceptable methods of starting the engine.