T-boss 410

So, did you use it again this weekend?

Mine is fuel injected, also. Has running without a thermostat and the fan on continuously, affected the fuel mixture or mileage?

I meant to ask you folks, are your machines fuel injected or carbureted?

That's good to know. What is used as an alternator on these vehicles?

Does it cause any stress on the battery and/or the charging system? I know the automotive electric fans can draw a lot of juice.

Thanks. I wonder if Water Wetter would add some cooling to the equation?

Yeah, I'm somewhat familiar with Dexcool from the automotive side. Never read or heard anything good about that stuff. I believe it was a GM favorite for some of their vehicles. Caused some major headaches for mechanics and owners. I can't believe that crap is still on the market!

Thank you, sir. I did a search of my own, and located numerous types of coolant, some being specific to powersports. Without being very experienced in the field of powersports, I don't know if the powersports-specific coolant is just a rebranded automotive coolant, or a good product. Most carry a hefty price compared to automotive coolant, and I'm not sure if it's any better of a product.

In fact I have. No particular type, just one that is compatible with aluminum heads and radiator. I thought maybe someone here may recommend something, since I am quite new to this. A particular brand, maybe?

What type of coolant is required for these engines? Is it the same as a car or truck? I would expect that it would be specific to a vehicle with aluminum heads and radiator. Thanks!

Would it need one if it's not supplying heat to the cab? I don't see the need for one unless it's used for heat.

Did you change your thermostat? Where did you find one?

So, you just leave the thermoswitch in the radiator? I take it you used enough tape to basically waterproof it? Thanks

I don't remember if I asked you (the memory is the first thing to go), but how did you wire in the bypass?

Gees, I'm just passing along some information that may or may not be useful for another Massimo owner. Maybe that could save them from the situation that you went through. Replacing the thermoswitch would (I assume) be much less expensive than a new head and gasket, along with the labor. Just trying to do some good here.

I hope this is something you don't already know, and if it is, I apologize. I had sent an email to Brandon Beaver, a tech for Massimo, asking about the ECU programming. According to him, the ECU isn't responsible for when the fan comes on, but it's a thermoswitch that's mounted on the radiator. He says that a thermoswitch that is rated at a lower temp can be purchased (although he didn't mention where) to replace the OEM one. He also advised the the temp is set at 215-220, and that Yamaha has theirs set at 217, and that range is normal in the powersports industry. Hope this helps, but if it doesn't, just ignore it. I was just trying to give an alternative to the fan fix.

I think you misunderstood me. The automakers have set up the cooling systems in passenger cars and trucks to run hotter than I would like, with the reason being it's more fuel efficient. I was just curious if maybe that was the reason that Hisun programmed the ECU to fire up the fan at such a high temperature. Have you thought about the possibility of the fan motor burning out from running constantly? Is that a part that can be obtained from other sources than Massimo? I wonder what other makes of UTV's have their fan set to run at? I know there are programmers out there for other makes of UTV's, but I haven't found anything for the Massimo.

So, there is no known way to reprogram the ECU to lower the temp for the fan to kick on? There's lots of programmers out there in the automotive industry that will accomplish that. Could it be set at that temp for environmental reasons, ad the automakers did?

Well.....that don't make me feel good! What is the problem within the cooling system?

Am I correct in assuming that, per earlier conversations, that it's the Hisun engines that are prone to overheating?

What make is the engine? A member here (Joe Breaux) had some overheating issues with his Massimo. He managed to override the thermostat and has the cooling fan running constantly, as long as the engine is running. Fixed his problem. I have a 2019 T-Boss 410, but haven't had any such issue (yet), knock on wood! I understand that Massimo had some overheating issues with a certain make of engine, and they switched to another engine maker.

Looks like you got all the bugs worked out on it. Maybe you can pass along your fix to Massimo so they can help others get theirs fixed 👍Lol, just kidding! Glad to hear that it's finally working so you can enjoy it.

Well, that gives me a warm feeling inside...not! I don't know what make the engine is in mine. I believe that the control arm covers say Linhai on them, so I would assume that the engine is a Linhai? Did you purchase yours before December of last year? That's when I got mine. I also got mine through Ebay, in an online auction.

Do you know if it's limited to a particular model or engine size? I did a quick search for that topic on the internet, but didn't come across anything.

Gotcha. Does yours have an LCD screen with rpms, coolant temperature, fuel level, and mileage?