1990 Evn 225hp (V-6) Carb Specs

[kennedyt]

Rebuilding my carbs. Need good reference source for factory specs for needle and float adjustments.<br /><br />Also how to tune all 6 carbs for down-the-road adjustments.<br /><br />Thanks, Tom

 

[Dhadley]

Re: 1990 Evn 225hp (V-6) Carb Specs

Welcome!<br /><br />All the specs are in the service manual. Those linkages can be tricky sometimes. The OE manual has excellent step-by-step proceedures.<br /><br />The manual will more than pay for itself on this one job.

 

[kennedyt]

Re: 1990 Evn 225hp (V-6) Carb Specs

Dhadley,<br /><br />I've got the OMC service manual for my specific engine and when it comes to needle and float valve settings it says to refer to factory specs.<br /><br />Those illusive specs are what I need. How many turns do I back then out after seating the replaced needles?<br /><br />Just found this forum. Thanks for the welcome aboard!

 

[Dhadley]

Re: 1990 Evn 225hp (V-6) Carb Specs

Are you looking for the float height setting (moves the inlet needle in and out of the seat in the carb bowl) or the setting for the adjustment screws?

 

[kennedyt]

Re: 1990 Evn 225hp (V-6) Carb Specs

Adjustment screws....idle, mid and high

 

[Dhadley]

Re: 1990 Evn 225hp (V-6) Carb Specs

There are no adjustable low speed jets on those carbs (assuming those are the correct year carbs). No recreational V6 looper had adjustable mid and high speed jets.<br /><br />You should have fixed air bleed jets for low and mid range and a fixed fuel jet for high speed.

 

[kennedyt]

Re: 1990 Evn 225hp (V-6) Carb Specs

Ok. Now I'm confused. Service manual shows 3 adjustment screws. 2 on the left side of the carb face and the other at the float valve at 6 o'clock position beneath the carb body. It also refers to factory setting when replacing the needles. <br /><br />Just screw then in all the way?<br /><br />How do I adjust for rich/lean mixture and balance carbs?

 

[Dhadley]

Re: 1990 Evn 225hp (V-6) Carb Specs

There are no adjustment screws on a 1990 225 carb. The float height is adjusted by bending the float arm.<br /><br />When you say "left" side of the carb do you mean facing the carb or are you looking at something on the port side of the carb?<br /><br />Are the things you are refering to small brass pieces with holes in them?

 

[kennedyt]

Re: 1990 Evn 225hp (V-6) Carb Specs

Yes. Manual states calibration of the carb to accomodate changes in factory specifications, weather conditions, altitude.<br /><br />Idle mixture and intermediate mixture controlled by two bleed air orifices (the brass things) and the high speed contolled by the fuel orifice (located on float chamber)<br /><br />The two air orifices are #34 (idle) and #47 intermediate. <br /><br />I think I now see what you are saying. The orifices are fixed to those sizes (.034 and .047)<br /><br />Same goes for Float valve.<br /><br />Remove/replace is only adjustment. Unless changing size of orifices.<br /><br />Right?

 

[Dhadley]

Re: 1990 Evn 225hp (V-6) Carb Specs

The float in the bowl is adjusted by bending the arm. There is a specific height for that.<br /><br />I think what you are refering to is the hi speed jet in the float bowl. Be careful not to over tighten that jet. It screws into plastic.

 

[kennedyt]

Re: 1990 Evn 225hp (V-6) Carb Specs

Got it. Thanks.

 

[Dhadley]

Re: 1990 Evn 225hp (V-6) Carb Specs

Keep us posted!