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Hisun Axis 500 Speed limit


Sylvain Gravel

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KGS just to be clear, since the question is about the speed limiter relay:

The max speed is controlled by the gear ratio of the belt on the primary/secondary clutches.

The max engine rpm is controlled by the Delphi MT05 ECU. It is technically adjustable, but it is set to be a safe limit to prevent blowing up the motor.

The speed limiter relay kicks on when the shifter is in reverse to limit the max speed. This is an add on by Hisun because there is no gear input for the Delphi ECU, which is designed to be a flexible, cheap fuel injection solution for a variety of small engines.

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  • Alex changed the title to Hisun Axis 500 Speed limit

There appears to be a couple of experts here and had a question not related to speed but gearing. Is there a way to change the gearing ratio to improve torque? I have an Axis 500 and use it for launching a boat in a small lake on a gentle slope. It will pull it out but if one side of the trailer gets stuck, the engine just Boggs down in low; even in 4 wheel and locked differential. I would have thought the rear wheels would at least spin.

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Basically replacing the clutches with something non standard, or putting smaller tires, so more or less not practical to change gearing.

Keep in mind these things just don't make a lot of HP and the trailer might be too much to haul around. I would expect it will effect the clutch life significantly towing the trailer around.

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Brent, 

The Axis has a wet clutch and then a belt.

If the engine is running then the clutch is spinning. There are paws the sling outward on the clutch that engages the clutch drum. There's not a lot of friction material on the paws.

 

The clutch drum has a shaft. That shaft spins the primary sheave. The primary sheave spins the cvt belt. The cvt belt spins the secondary sheave. The gearing is determined by how Hi or low the belt rides on the primary and secondary sheaves.

The primary sheaves has weights that will move outward so the space between the inner and outer section of the primary sheave varies so the belt can move up and down. 

Same thing happens on the secondary sheave except it is controlled by a spring.

 

If the engine is running, machine running and in gear. And machine isn't moving. Either the wet clutch or cvt belt is slipping.  Either is bad. Usually if the belt is slipping there is usually smoke and a smell. 

 

The weights in the primary sheave and spring in the secondary can be changed. This changes how the cvt belt travels up and down the sheaves and the gearing.

 

I don't know enough to tell you how to change the weights or spring for better performance for what your needing. Just kinda the basic operation. 

 

I have read on other boards about a spacer between the outer primary sheave and nut. That will lower the top speed a little to give a little more torque when riding up hills. But for what your needing I'd say it probably a combination of weights and spring in the sheaves.

 

Now most important thing. I'm no expert. And I may have explained things completely wrong. If I'm wrong someone let me know and I'll delete this post. I don't want to spread misinformation or point people in the wrong direction.

 

Brent, start your own post if you decide to tackle the pulling issue you have. I would like to know your solution. I live 10 minutes from the lake. And 15-20 minutes from 3 different boat ramps. I would like to take my Axis 500 and launch a boat. (Have 3. 16ft pontoon 25hp, 15ft bass 110hp, 14ft V bottom 5hp.) There's also a few places that I could launch, not a ramp, just the shore but I'd have to back out into the lake a little more that I like. And don't want to get stuck or sink up. 

 

Good luck.

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Greg's post is exactly right on the technical details. Unfortunately there aren't different springs and weights available off the shelf for these models so you would have to experiment. There are people with expertise adjusting belt drive clutches, primarily in snowmobiles, who may be able to male a good guess on what you need and identify compatable parts.

Unfortunately these belt driven vehicles don't do a good job towing heavy weights, because they're always subject to slipping, and ontop of that a lot of people report wear issues with Hisun wet clutches anyway.

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Greg & aefrn88,

Appreciate your advise.  I may just live with it for now and really don't want to get into the engine since I'm not an expert mechanic. it only happens when one trailer wheel gets in a rut.  Last time it happened I just backed down a little and got a running start. 🙂  

My situation is with a primitive landing that I built so I can repair where needed.  I have a Boston Whaler 14 Ft with a trolling motor on front.  I took off the gas engine since I'm not allowed to use gas on this particular lake.  It helps make it lighter too.

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  • 2 months later...

Theres a few things you can do to get more torque. You can shim the primary which will give you more torque but takeaway some top end speed. You couls also slug wet clutch which will make the wet clutch grab quicker and harder. Than the best mod but expensive is jbs machined sheave kit which will give you morr power everywhere. You can also i install an epi clutch kit with different weight rollers and secondary springs. Clutch parts for a yamaha rhino 450 fit.

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On 2/5/2023 at 5:35 PM, lincolnsq175 said:

Theres a few things you can do to get more torque. You can shim the primary which will give you more torque but takeaway some top end speed. You couls also slug wet clutch which will make the wet clutch grab quicker and harder. Than the best mod but expensive is jbs machined sheave kit which will give you morr power everywhere. You can also i install an epi clutch kit with different weight rollers and secondary springs. Clutch parts for a yamaha rhino 450 fit.

Thanks for the tips.

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  • 2 months later...

I have a 2019 Hisun axis 500. About two weeks ago it started sputtering when you accelerate. I bought it used in January. I started looking on forums and started on a journey to figure it out. 
the machine has 300 miles on it.

I looked at the driver seat belt safety switch. Then I changed the fuel injector because people were saying they were going bad after about 250 miles. It still had the original gas filter, so I changed that. No difference! Then I changed the air filter because it was pretty dirty. Today I changed the plug. Same problem.. I looked under the hood and seen the speed limiter. I unhooked it and that appears to be the problem. It runs smooth and accelerates nicely. I don’t go off road with it, I bought it to plow my property and take rides through the neighborhood behind us with my grandkids. I think I’m just gonna leave it unplugged. I do feel that all the other things I did were necessary anyway. 
hope this helps somebody

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