I bought 3 new rides last week a uforce 1000 for myself a cforce 500 and 600 for my 2 boys age 10 and 13, I want to lower the top speed way way down. I have been on them and watching them so they don't go too fast until the break-in oil is changed after the first 100 miles. I talked with the mechanic in the shop and he said they couldn't correct the fuel map to limit top speed, I'm trying to find out if it's possible I have done fuel map adjustments on cars and trucks via laptop pass-through to obd2 port. My oldest will listen and wouldn't drive too fast my youngest on the other hand is a daredevil like I was. Any info would be helpful

[2015 Z Force 800 53/Trail EPS]

First, this is the #1 reason they put an age limit of 16 on riding quads. Most kids just don't understand the forces and dangers involved with mass in motion. But some kids are brought up riding and racing from a very early age and do understand more then the average child.I assume yours fit in this category. Not going to be able to re-map or add a limiter to the existing ECM mapping..however some companies can re-map some...not all..ecms. If you are only worried about the breakin, the reality is 94-96% of the breakin is done in the first hour of operation. In just over 20 minutes of operation they need to start stretching the RPMs up there and backing it back down and letting it cool slightly before cycling it up there and a little farther so that after an hour they can get pretty close to the RPM limiter momentarily under load. With that said in the EU they put a speed limiter on the throttle on some and on the vehicle speed sensor on others that's tied in with the ECU to limit speeds. And other have it built into the ECU itself....that's why many try to get a US version shipped to them. For you I'm not sure I would worry about all that as they are probably already broke-in enough for then to let-them-eat a little without doing any damage. My worry is them understanding the dangers..and how it can get them into trouble..or worse. Make them practice braking..use cones so they get how long it takes...ect. I have a nightmare story about one of my son's friends jumping on his quad and running it through a barbed wire fence. Could have took her head off...it didn't but the image of her doing it will forever be in my brain. Can't be too careful.     

Yes they know what can happen and what they are supposed and not supposed to do but they always try and one-up each other but they see my scars from a bad bad accident I had that left me with a titanium rod from my hip all the way to my ankle, totaled a Ford ranger and a ole pulpwood truck with a hopped up 400ex when I was 16, truck driver was at fault believe it or not lol anyway I work offshore gobe 2 weeks at a time and when I'm not around they would be more inclined to push the limit of their abilities and I was just trying to prevent it. I wasn't buying a small 4wheeler they would outgrow in a couple years and have to buy more again later plus my boys are above the average size the almost 13 year old is 5'7" 200lb the 10 year old is 5'2 and about 140 so they are size accurate just not "age" appropriate

Finding an ECU programming tool that doesn't cost an arm-and-a-leg seems impossible. Many ECUs are locked down so they can't be manipulated except with manufacturer approved equipment.  So some of the ECU tools being sold may not actually allow one to read/write the map in the ECU.  The Dimsport (MyGenius) does work with some, maybe all, CFMotos.  But it's really quirky - it locks itself to the initial VIN its used on AND it requires a license file registered with a Master unit typically held by the supplier.  So those units you see labeled for "Personal ECU programming" are really slaves and without the license key are worthless.  Also breaking the VIN lock typically requires getting a new license key from the Master.  Many places (like eBay) are selling these but have no way of providing a license key, so buyer beware!

MSC actually sells a package for some CFMotos that includes an unlocked, licensed Dimsport with an updated ECU map file that you can install yourself.  But they're not inexpensive! Atvflashing.com will reflash your ECU for a more reasonable price but you have to send them your ECU or one that can be flashed which fits your unit.  Finding an inexpensive spare ECU that will work can be difficult but may be possible shopping on AliExpress.  There's also an outfit in Italy (oldskulltuning) that will sell you an inexpensive map file and a SW tool for adjusting parameters in it, but you need an ECU programmer to load the modified file.

One downside of remapping the only ECU you have is that if you ever take the unit into a dealer for work they may reload your ECU wiping out all your changes.  So it could be a good idea to have your own reprogramming  capability and save your files for reflashing, or have a spare ECU handy.

If anyone has a source for where to get an ECU programmer that works with CFMoto that is fairly inexpensive it would be helpful if they'd post their findings and recommendations here!

Last note about limiting speed:  I once bought a small 4-wheeler for my young children.  It came with a restrictor plate installed between the carb and the intake ports.  It was intended to be removed when the kids gained experience.  Simple thing to do unless you're dealing with fuel injection. :-)

[Kids today rarely even ride a bicycle to the extent that we did]

First, this is the #1 reason they put an age limit of 16 on riding quads. Most kids just don't understand the forces and dangers involved with mass in motion.. But some kids are brought up riding and racing from a very early age and do understand more then the average child.I assume yours fit in this category... My worry is them understanding the dangers..and how it can get them into trouble..or worse. Make them practice braking..use cones so they get how long it takes...ect. I have a nightmare story about one of my son's friends jumping on his quad and running it through a barbed wire fence. Could have took her head off...it didn't but the image of her doing it will forever be in my brain. Can't be too careful.     

The problem with the much more powerful and larger machines of today is that no one remembers the carnage involving the much smaller and much less powerful machines of yesterday. It got so bad and still is that my wife and I sponsored a trainer and youth atv riding class in our neighborhood.
I want to commend NMKawierider for sharing just how much watching someone else's kid almost kill herself affected him. There are countless parents out there who are still in a state of shock. The facts are this as he alluded to: Kids today rarely even ride a bicycle to the extent that we did. The ones that have grown up on machines even all of their young life truly have never possessed the sense that God gave him and are 95% of the time just plain lucky if you knew what they were doing. You can't simply 'watch them' on these things nor worse yet somehow believe that a speed limit controller will prevent anything.
I am a firm believer in the 16 year old age rule this side of using them to work with (scary enough) despite my strong aversion to the government mandating anything in this regard.

I've just seen too much as NMKawierider offered, witnessed too many parents grieving and have zero trust whatsoever in a youth's ability to listen, practice and not act stupid with all that power and responsibility.

When you mention that your youngest under 16 will be the problem?
These machines are so dangerous that frankly you have no idea (Edit: You had a 400EX so you do).
Those rev-limiters will be off in no time. Research what happened to youth all over the Appalachians/elsewhere not that long ago and still to this day where these machines have always been prevalent. Youth and power simply do not mix and the statistics are sad enough for me.

And remember, this is from a guy who is still pissed from back when they banned the 3-wheelers in terms of personal responsibility...after you are no longer someone else's.
Good luck on your decisions moving forward and I likely did not understand but am hoping that your serious accident did not involve that 400EX.
If so, yeah I don't understand (your business and your family).

 

Put a small clamp or a sleeve on the throttle cable to restrict the throttle opening.