IMO I highly doubt it if it wasn't having problems before? Why did you have it service? Routine or did it have problem? Some street cars carts have twins honda or KAW engines in them if there on easy-go frame? Is you're single cylinder or twin? Did the service include spark plug/plugs and air filter change? If so that would be the first place I would look? It you can't do this yourself, try somebody else. Backfire usually means unburnt fuel left in the combustion chamber creating fuel rich environment. Which could mean carburetor problem, timing problem, Air restriction problem, and spark plug gap problem IMO
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