My 149 (and 108s) have a long triangle with the metal decal in the steering wheel. Agree, the engines were yellow from the factory. As were the starter/generators up until the 1X8/9 series (including your 149) when they were black.
I know the restoration can be expensive. I think I spent close to $2000 on my 108 restoration, including an engine overhaul. It's as good as new now. I love it, and don't regret the cost at all. It runs SO sweet now. Perhaps your 149 needs a new muffler? It might help the noise.
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