I have tried both. Premium gas is okay but I noticed that the engine is super hot. Since it has a sidebar for service only, I found unleaded gas better. Performance is okay and engine cooler. Hope this one helps fellas.
What i know is unleaded gas compatible for tmx 155.. high octane gas can cause overheat.. hope can help
Super is the way to go. try using some stabil marine formula gas treatment if your bike does a lot of sitting
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