RTV 400 Fuel System Conversion
- Thread starter T Skaggs
- Start date
GreensvilleJay
Well-known member
Equipment
BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
sure you can (some conditions apply, E&OE ) ....
step 1. get make/model info of the current engine
step 2. see if maker has same engine, but carb version
step3 ..compare 'bits and pieces' to see what's needed
step 4. price out the 'bits and pieces'..is it cheaper than an ECM ?
BTW what's 'bad' with the ECM ?
step 1. get make/model info of the current engine
step 2. see if maker has same engine, but carb version
step3 ..compare 'bits and pieces' to see what's needed
step 4. price out the 'bits and pieces'..is it cheaper than an ECM ?
BTW what's 'bad' with the ECM ?
It's been a while since my one encounter with a 400, and my recall is sketchy. But I remember considering replacing the EFI with a carburetor.
Does that ECM also control the spark? If so, you'll also have spark to consider.
The engine was designed by Subaru from their EX40, used in Club Cars and other applications, which used a carburetor and rated at 14 hp. They apparently added the EFI for Kubota. Robin got involved and Subaru exited the small engine business. You can still buy a Robin EX40. You may be able to adapt some EX40 parts to your engine, I don't know. You'd probably have to come up with a manifold, air cleaner and carburetor/transmission linkage, at least.
Does that ECM also control the spark? If so, you'll also have spark to consider.
The engine was designed by Subaru from their EX40, used in Club Cars and other applications, which used a carburetor and rated at 14 hp. They apparently added the EFI for Kubota. Robin got involved and Subaru exited the small engine business. You can still buy a Robin EX40. You may be able to adapt some EX40 parts to your engine, I don't know. You'd probably have to come up with a manifold, air cleaner and carburetor/transmission linkage, at least.
North Idaho Wolfman
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GreensvilleJay
Well-known member
Equipment
BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
hmm... is the injector resistance now too high ?? Any 'spec' on it like ' 2.05 to 2.45 ohms'
are all the wires and connections clean and tight ?
Injectors require a lot of power for a brief time so it is 'mission critical' electrons can easily flow.
The actual ECM may be fine, several other things can be suspect though.
is this the beastie ?
for sure you'd need to clean ALL of those connections and ensure a tight fit to cables.
are all the wires and connections clean and tight ?
Injectors require a lot of power for a brief time so it is 'mission critical' electrons can easily flow.
The actual ECM may be fine, several other things can be suspect though.
is this the beastie ?
12 Kubota RTV 400ci throttle body controller ecu ecm | eBay
This ecu was pulled from a 2012 rtv400 with 1162 hours. In the coming days I will be listing more items from this machine. feel free to message with questions or part requests. Satisfaction guaranteed.
www.ebay.com
for sure you'd need to clean ALL of those connections and ensure a tight fit to cables.
When I ran a voltage output test on 116-117 I was supposed to get 5 to 7 volts but I had zero volts on those pins.
GreensvilleJay
Well-known member
Equipment
BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
without seeing the documentation, it sounds like the 'output transistor' or whatever active device they're using has 'opened' or PCB traced has opened or solder connection of connector to PCB has failed.
1st and 2nd failures should be 'rare', #3 is common as wave soldering big connectors AND SMT devices on same PCB is a bit of an artform. Too much heat/time...little pieces fall off, too little and connector joint is 'cold'( will fail in future....)
1st and 2nd failures should be 'rare', #3 is common as wave soldering big connectors AND SMT devices on same PCB is a bit of an artform. Too much heat/time...little pieces fall off, too little and connector joint is 'cold'( will fail in future....)
Just an update, I have found a carburetor that was inexpensive and it bolted right on, the linkage even matched up. It will run briefly but the high pressure fuel pump will flood the carb. I am in the process now of installing a pressure regulator.
Can you do away with that pump and use a 12v pump from AutoZone or Advance? When you get this running, you need to start a thread with all the details.
Another update, I did as suggested, I purchased a 12V pump with a PSI rating of 4-7 and it works perfect I took the high pressure pump out of the tank and with a little modification I attached a pickup hose and filter. It runs well in the shop, I have yet to get it outside to see how it preforms but it raps up and sounds good in the shop.
I had a Kohler we switched over to a carb and even using a 4-7 PSI pump I still had to install a regulator after the fuel pump and turn it down to 2 PSI or on a warm day it would flood the engine sometimes. After installing the regulator I never had another issue and its been running for years that way. Just food for thought.
GreensvilleJay
Well-known member
Equipment
BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
hmm, any chance you can tie into 'valve cover vacuum' ? If so, use one of the 'vacuum' operated gas pumps as seen on lots of riders. B&S, Kohler, engines. Might be an option ???
here's a sample of what I mean and used....
I'm sure Amazon sell them....
here's a sample of what I mean and used....
I'm sure Amazon sell them....