GY6 parts are going to be cheaper and more plentiful. There are also more performance upgrades and part for the GY6 as well.
That being said. If I was in the market for a 4 seater buggy and had to choose between the TM 150 or the 300, I'd go with the 300. I'd look for the EFI version if they had it too. But if I couldn't get it with EFI, I'd still go with the 300.
Reason being is that you get so much more grunt with the 300 over the 150. Even if you add upgraded parts to the 150. Plus the 300 is water cooled. These are things I'd want when having to carry 4 people.
If you can work on a GY6, chances are you can work on the 300. It's still a single cylinder CVT scooter engine with water cooling. It's just vertical instead of horizontal.
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2010 Carter Interceptor GTR 300
2010 Hammerhead 250 SS
2015 Kandi 49FM5 110cc
2015 Hammerhead GTS 250-SOLD
2008 Kazuma Coyote 150-SOLD
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