| Hi Mole and Welcome to the Forums,
The GS15 should go straight into the Nitro Racer No problem as the crankcase is essentially the same size as the GX12 engines. (I have both engines)
The main concern on the one you are looking at, is to make sure that the exhaust would clear the touch starter...as it has been designed by Kyosho it probably will but I would still check it out. It should fit onto the chassis ok (I have a spare chassis here so I have checked that bit out) If you can find a store near you with one of these engines in why not take your car there and check it out just to make sure.
If it was me I would go for it as I can always do modifications if they were needed.
Pull starts for the GX12 engine are cheap enough to replace new too !!
Regards.......Mark
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