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This is a Wasp .12 roar engine. This is for a rear exhaust. With a slide carburetor. |
| This is a SP12TRP (SG shaft). 4-port design with a slide carb. |  |
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This is a HPI nitro star 12R SS Engine. This has a twin needle carburetor. |
| This is the Traxxas 2.5 engine. It has a rear exhaust with a slide caguretor. |  |