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Here is a GO motor identification listing I PM'd to someone ages ago - lucky I saved it !



" Gen 4
Plain cooling head with GO and 21 only on it. 5 Port was silver, and 7 Port was orangy gold.
Front of carb body all black. Carb end where the HSN body screws in was plain alloy (uncoated). Carb neck has plastic insert. Older standard RTR 28-0600 type con rod.

Gen 5
Plain cooling head with GO and 21 only on it, just like the Gen 4 and same colours. Front of carb body all black. Main difference externally is the carb end where the HSN body screws in. It is coated black, with just the flat end left alloy.
Internally it is the same except for a new soild carb body (no plastic insert) and the pinch bolt assembly is O Ringed on each end (same as all models from here on). Still has the older RTR 28-0600 type con rod.


Gen 5.5
Cooling heads were same colours, but had more writing on them. "Go Racing" etc, plus a flame design around the GO logo on the rear (exhaust) side of the cooling head. Carb is the same as Gen 5, including the HSN body being black with alloy end, but the 5.5 carb has a red and white sticker on the front of the carb body.
Internally it has the new 5.5 crank. The main thing discernable to the naked eye with the new crank is the groove behind the counter weight area has been removed. There are other small changes to the 5.5 crank that will not be as obvious. It also has the newer 21-0600 Pro con rod, which is distinquished by grooved ends around the bushings.

Gen 5.5 GX Series
Pretty self explanatory with the orange head, coated crank, double O Ring HSN needle etc.

NB: The very first 3 Port R Specs to come out were Gen 5 as above, with a coral red cooling head and a grey crankcase.
The Gen 5.5 3 Ports were the same as the 5 and 7 Ports with a coral red cooling head.

This should be enough to distinquish the motors externally and internally, even if someone has swapped cooling heads etc. "


Hope that's of some help guys.