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Author Topic:   Accu Mix R - Availability FYI
mtbadfish posted 07-10-2003 12:13 PM ET (US)   Profile for mtbadfish   Send Email to mtbadfish  
Thanks to Bigshot for mentioning this part and sending me Tom Clark's way and to Tom who gave me the part name and sent me in the right direction.

I found it through Mastertech in Florida who had it shipped from their affiliate on the West Coast.

Incase anyone is looking for or are considering one the Bombardier part # is 174870. It ran $141, which is a little pricey, but I figured the ablilty to use my main tank and keeping the deck clear of a standalone tank makes it a little more affordable.

I suppose a search for the part may turn up some better pricing, but I will tell you that Mastertech was very good to deal with.

For anyone interested in one of these, as Tom pointed out, make sure you get the proper Accu Mix R, in that they came in 50:1 and 100:1 models.

mtbadfish posted 07-10-2003 12:20 PM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     
By the way the price included shipping.
jimh posted 07-11-2003 09:17 PM ET (US)     Profile for jimh  Send Email to jimh     
Sounds like good information, but what is it?
mtbadfish posted 07-11-2003 10:53 PM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     

It is an oil injection system OMC created for their non-VRO motors. Originally they came pre-set for a mix of 100:1 and the second generation of Accu Mix R is 50:1 for the newer motors.

It is a jug that you mount to the boat that has input and output ports for the gas line and that's about it.

Tom Clark filled me in on this and also point me to Joe Kriz's website where one picture shows an Accu Mix R installed on the splashwell of his Montauk.


mtbadfish posted 07-11-2003 11:06 PM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     
Why post once when I can make multiple posts.

My main motor is a 175 Johnson and I was looking for a kicker that could utilize my OMC dual controls I already have mounted. I was leaning towards a 4 stroke kicker so I could utilize my main gas tank and avoid cluttering the deck with a gas can and it's appurtenances.

I ended up buying a Johnson 25 2 stroke and got the Accu Mix r.

Tom W Clark posted 07-12-2003 02:34 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The Accu-Mix-R is NOT an oil injection device but rather an oil mixing device that mixes oil with the gas at a constant rate. Straight gas goes in one hose and 50:1 gas/oil mix comes out the other hose.

This is a very simple and highly reliable way to supply a two stroke kicker motor with fuel on a boat with a large built-in tank of straight gas without the need to carry an auxiliary fuel tank for the 50:1 mix. It also eliminates the hassle of measuring and calculating the oil to add to said tank.

I've owned three of these units and never had a lick of trouble with them.

Mike, thanks for digging up the info on these units. I'm glad they are still available.

By the way, though these were developed by OMC and are being sold now by Bombardier, they are universally applicable. The unit will not know, nor will it care what brand of outboard you are using it with. The only limitations are that the mix is 50:1 (one exception noted above) and both the in and out hoses are 5/16" inside diameter.

mtbadfish posted 07-12-2003 06:42 AM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     
Thanks for the clarification on the injection vs. mixing. I had originally started the sentence with "For lack of a better term", but then removed it.

Obviously, given this thread, I'm still working on clarity in my posts. I'll get there one day.

The note about them working on other brands of outboard motors is something I had intended to inquire about, but assumed that it was the case. Still a very important bit of information.


mtbadfish posted 07-12-2003 07:04 AM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     
Important distinction regarding fuel pump capacity.

A little more info from the Installation Manual:

"*5 thru 15 models must use a high capacity fuel pump with AccuMix. If your engine has the high capacity pump no modification is necessary... If your engine has the standard pump, it must be removed and the high capacity pump kit described below installed:"

5-8 thru 1990 P/N 431945
5-8 1991-1992 P/N 434727
9.9-15 manual start 1985-1992 P/N 431960
9.9-15 electric start 1985-1986 P/N 431960

"High capacity pump is standard on 5-15 manual start beginning 1993, and standard on 1987 and newer electric start."

"These high capacity fuel pumps are designed to handle fuels with more alcohol; fuels with higher vapor pressure, higher lift height from tank to engine and to draw fuel and oil from the AccuMix unit."

whalersman posted 07-12-2003 12:37 PM ET (US)     Profile for whalersman  Send Email to whalersman     

I had to change the fuel pump on my 1988 Evinrude 8HP to the higher capacity pump..

It was a very easy and simple thing to do for anyone that is interested.

My 70HP Evinrude already had the VRO so it was an easy decision to add the Accumix R tank to my Montauk so I could use the original two 12 gallon tanks with straight gas. I hate mixing oil in with the gas.. As pointed out, you do not have to add another fuel tank to the Montauk which is limited on space anyway.

I mounted the unit on my Splaswell as I did not want any Fuel Lines inside of my console that would have a chance of leaking fuel and/or fumes with the possibility of causing a Fire or an Explosion.... 2 screws were all I used to mount the bracket to the Splashwell...

The unit seems to work great as I have not had any problems with it...

Joe Kriz

mtbadfish posted 07-13-2003 06:31 PM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     

Thanks for the added recommendation. I'm glad I was told about the Accu Mix R. It will definitely fill the bill for me.

I enjoyed looking at you photo's, and the view of your Accu Mix R installation makes it look like a straightforward install.

Nice site and a sweet fleet you've got going there! The drawings are one helluva resource.


dscew posted 07-13-2003 06:56 PM ET (US)     Profile for dscew    
Are these just for little kickers or will it work for my 1974 75 Evinrude, which is 50:1?
mtbadfish posted 07-13-2003 07:24 PM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     

The only notes that I came across while reading the installation manual were the references to the 5-15 motors that I outlined above and there is another to it being suitable for CO and later models without modification.

This kind of leaves it open with regard to your situation, but it appears the main criteria are:

1. That you need to have the High Capacity Fuel Pump

2. It cannot be installed in situations where there is a below deck gas tank with an anti-syphon valve without modification the the valve set-up. This would be encountered where the gas line would be run below the top of the tank. In such a situation they rocommend installing a tee on the fuel tank pick-up, connect the anti-syphon valve to the tee and connect the line that runs below the top of the tank to that. Then run a line off the remaining open end of the tee to the AccuMixR, making sure to keep the gas line above the top of the tank.

There are no specifications regarding the capacity numbers for the pump, just that it is the High capacity Fuel Pump.

Check with your mechanic, or give Bill Kelly at Mastertech a call at 850-936-4231, he was very helpful.

Maybe Dick or someone else here can give you a hand determining which pump your motor has.

Hope this helps.


mtbadfish posted 07-13-2003 07:28 PM ET (US)     Profile for mtbadfish  Send Email to mtbadfish     
Correction -

The "CO and newer" should read "Can be used on CO and newer 20 thru 50 models without modification"

Wouter posted 06-18-2005 10:54 AM ET (US)     Profile for Wouter  Send Email to Wouter     

I'm also very interested in the accu-mix system...

I have found a site who sells part # is 174870 on the internet with the following information:

Remote oil injection kit for auxilary installations. 1986 and newer 5 thry 50HP

Our boat has an EVINRUDE 235 HP of 1983, is it also possible to use the installation?

I think we have the strong fuel pump because the gauge indicates a pressure of 4-5 bar...

A last thing I would ask is if the ACCUMIX system includes also a reservoir with the 2-stroke oil, because there must be something to store this oil...


where2 posted 06-18-2005 03:38 PM ET (US)     Profile for where2  Send Email to where2     
Generally most engines above 50Hp utilize a 3/8" fuel line so that they are not subject to fuel starvation at high RPM's. Therefore, I suspect that the AccuMix-R is NOT suitable for engines over 50Hp, based on the 5/16" lines it utilizes.

Also note that the built-in 1.7 quart oil reservoir was intended to provide enough oil for 38 gallons of fuel at 100:1 ratio (that's 18 gallons at 50:1). (according to the 1987 OMC accessory catalog I just happen to have here next to the computer).

My favorite design of this system was the 6 gallon AccuMix fuel tank. (a 6 gallon fuel tank with this mixer built into the tank itself). Too bad they didn't offer it in a plastic tank version... (although with Florida's high UV content it would have been toast by now)

Wouter posted 06-19-2005 09:45 AM ET (US)     Profile for Wouter  Send Email to Wouter     
Thanks for the information.

Does that mean that there doesn't exist a solution for my engine?


LHG posted 06-20-2005 02:22 PM ET (US)     Profile for LHG    
LHG posted 06-20-2005 02:29 PM ET (US)     Profile for LHG    
Let me try that one again.... whaler's with engines other than OMC, for some reason, usually only need 5/16" fuel lines. I have noticed that OMC use the 3/8". As a matter of fact, my both my 115's and 200's came with Mercury OEM fuel lines 5/16" diameter, so there must be plenty of fuel flow.

Mercury also used to offer an "Accu-BLend" fuel mixer on some of thier engines as a stop gap until they brought out oil injection on the mid range engines. In 1986-1988, the in-line 6's came with this feature.

The Judge posted 06-22-2005 11:35 AM ET (US)     Profile for The Judge  Send Email to The Judge     
Larry I have one of those off a 87 merc 50 sitting in my garage. Would it be worth it to put on my "new to me" 15' with a 70hp Evinrude?

Anyone want to shoot me an offer for it before I decide to mount it?

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