joewinsor

That looks exactly like mine. Doesn't make sense the fuel gage does not work. I'm guessing float must be stuck. I did check it out briefly this evening. Plug on pump looks good. I have to get a tool to remove retainer, but I tried fishing a coat hanger thru filler into tank thinking I might poke free a stuck float but nothing happened. I can't believe the digital gage would be bad. It's a brand new UTV. 

Great! Thank you Matt.  Probably wont get to it until the weekend. I will let you know. thanks, Joe

Another separate issue is the gas gauge shows 1/4 tank when it's full.  Any thoughts Matt? Anyone?

Dummy me. I was pulling my hair out on this problem for no reason. If I was a safe driver and wore my seatbelt I would have already solved this, LOL.  

I simply took a ride with my seatbelt on. Problem fixed, goes as fast as I need now.  For the heck of it, I did unplug the seatbelt indicator wire and it lets the vehicle go full speed also.  So, to recap, apparently there is a speed limiter with the seatbelt indicator.

30 minutes ago, strike250 said:

I have a question about your HS400. when you are driving it, do you have the seat belt connected? Just wondering because it can effect the speed limit. I would go to the back of the seat belt connection located when you lift the bed up, you will see the light grey connector. Unplug the electronic connector for the seat belt and try it again. See what happens.

Yep!  Dummy me. If I was a safe driver and wore my seatbelt I would have already solved this, LOL.  

After I read your suggestion, I simply took a ride with my seatbelt on. Problem fixed, goes as fast as I need now.  For the heck of it, I did unplug the wire and it lets the vehicle go full speed.  So, to recap, apparently there is a speed limiter with the seatbelt indicator.

Thanks for the tip Matt. 

On 3/11/2018 at 2:32 PM, strike250 said:

Just an update on the slow unit issue. I wanted to make sure I get back to everyone regarding the slow top speed on their Hisun 250's. After confirming with HiSUN, the 2017 and newer units have a different gearing inside the engine as well as a modified ECU. This was in response to customer feedback regarding top speed. Some customers were complaining about the units going too fast. So HiSUN changed some things to help control this. I am sure this is the new response from most manufactures now a days.  As no one wants to get sued or have legal issues. It has gotten to be a very liable state we live in now, and if just a few people complain about something, things get changed. I am working on new sprockets which should be here within a week. I am also working on the ECU and hopefully it will be done about the same time. I have yet to confirm if the old gearing will still be available or if it will automatically supersede to the new part number. I will keep everyone up to date on my website.

Matt

Hi Matt. I have been reading this thread and I think I have a similar issue. 

I bought a new HISUN HS400 EFI recently. Still in break-in period with about 15 miles on it. This thing starts and runs just fine, like new, but at about 12mph it sputters/stumbles/boggs and does not want to go any faster than 12MPH. 
Does not sputter in neutral and revs very well in Neutral. 
Any thoughts on what is wrong?

I bought a new HISUN HS400 EFI recently. Still in break-in period with about 15 miles on it. This thing starts and runs just fine, like new, but at about 12mph it sputters/stumbles/boggs and does not want to go any faster than 12MPH. 
Does not sputter in neutral and revs very well in Neutral. 
Any thoughts on what is wrong?