I have a 1996 Honda foreman 400 4x4. It works great but I’m tired of dealing with the carb on this engine. Can someone point me into the direction of a efi system that I can make work on this ATV?

 

its not worth the expense on a old machine like that. by the time you get the conversion and computer and then you have to tune it to your machine and that can be worse then tuning a carb..

 

We have the information you seek on the ATV Connection homepage, here:
https://atvconnection.com/articles/a...my-older-quad/

 

So where could I buy this kit at?

 

I see a kit from Shanghai on eBay for US$288, shipped. If you would rather pay Bezos, I am sure they have one, too.

That is a lower price than an OEM KeiHin or Mikuni carburetor. And less than the cost of an EFI scan tool for an ATV with factory EFI.

I would try it out. Please report on your experience if you go that route.

 

Don't do it. That Honda carb is about the most reliable and smoothest I work on, fitted to the 300 it gives instant starting and a smooth idle. Only slightly less so on the longtitudinal engine models. If you are having trouble, it is worn out or you have dirt in the tank. If you think dirt in a carb is difficult to live with, try running a bike with dirt in the injection system.

 

Filters, man.

90% of problems with ATVs has got to involve carburetion. And I have fixed way more than my share. Eliminating the problem of leaky or stuck carb float needles and cold starting is a major benefit of EFI. Any EFI system will have much better fuel filtration than a carb system. Also, the fuel pickup is no longer on the bottom of the tank since now you have a pump, which will usually hang down from an access port in the top.

My Kymco MXU 450i is still running flawlessly. Now if I could just get a scan tool.....

 

"Any EFI system will have much better fuel filtration than a carb system."

Sadly no. They all use "tea bags" not very fine filters and almost exclusively in the most difficult place to get at that they can find.For example, Suzuki 450 to 750 King Quads, remove all electrics under seat, remove rear plastic, still cant get at it without removing the fuel tank, which involves removing rear "toolbox" and side plastic. Split fuel pump plastic housing, it is one of those easy to assemble, almost impossible to take apart things. For the first two years of production Suzuki refused to sell new "tea bags" we had to use Evo3 ones which didn't fit properly. Fine dirt gets through the tea bags and regularly bungs the injector filter, and occasionally seizes the pump.

 

90% of atv issues is user error...lol... 30 years of using carburation and only issues i had were with things i bought off other people... Carburation is quite easy to keep running smoothly by just paying attention to what you are doing most of the time....

 

You let any carbureted engine sit around with gasoline in it for months or years, and a fuel system problem becomes likely. Especially with our US-mandated E10 fuel with 10% ethanol in it. Engines are like livestock: they need to be fed and exercised regularly or they will die. I guess you could say that failure to do so is "user error". Regular use of all my tractors, ATVs, chainsaws, and other small engines is key to minimizing fuel system problems.

As for fuel filtration, quads usually come with 2 plastic filters in the bottom of the fuel tank, and sometimes a sediment bowl in the petcock. When a tank starts to rust, the fine oxide particles can go right thru these filters. All ATVs should use plastic tanks, but sadly they don't. Gasoline EFI systems use a large bag filter ("tea bag") in the tank, suspended over the tank bottom, which is superior IMO. Sediments and water settle to the bottom of the tank and are not so easily picked up by the fuel pump.