boyesen reed valve question

[snake eater]

Hello, I recently purchased boyesen reed valves for my 1985 50hp envinrude e50tlcob. The instructions say that for my motor I need to reduce the size of my air idle jet by 5 thousandths, the stock air idle jet size is 36 which means I need a size 31 Unfortunately I have not been able to find any different size of air jet. Is there somebody that makes these jets or has had this problem any solution?
thanks Doug.

 

[Dhadley]

Re: boyesen reed valve question

The jet sizes are in the OE service manual with their part numbers. Any Evinrude dealer can get you whatever jet you need.

 

[snake eater]

Re: boyesen reed valve question

I have already been to the dealers in my town and Ive been to a few online stores like Ishopmarine. They did not have options for air jets , nor can they get them.

 

[Jayrock]

Re: boyesen reed valve question

I have already been to the dealers in my town and Ive been to a few online stores like Ishopmarine. They did not have options for air jets , nor can they get them.

Not just a "Dealer" an EVINRUDE DEALER.

 

[snake eater]

Re: boyesen reed valve question

I have tried Evinrude themselves and with no luck. I have no evinrude dealers specifically I have 6 boats stores in town and none of them had what I was looking for only something close that I can drill out.

 

[boobie]

Re: boyesen reed valve question

If the jet has a 8/32 thread size, the part # you want is 318823. Try any BRP dealer. The jets were listed in the older OEM manuals but thanks to our wonderfull EPA the mfg can no longer do that. I got that # out of my '89 manual.

 

[Jayrock]

Re: boyesen reed valve question

Maybe someone here has the manual for that engine and can get you the exact part number. That will help you immensely. If you cannot source them locally find the nearest evinrude dealer and call them. Tell them what you need, and see if they ship. Pay with a credit card, and voila! Also, have you tried running the motor with the stock jets yet? The motor may run just fine, ya never know...

 

[boobie]

Re: boyesen reed valve question

That is the exact part #. The older manuals listed ALL the jet sizes that were made for all the different mtrs. All you had to do was look at what jet size and thread size you were looking for and it would give you the part #. The 318823 part # is for the the 31 size.

 

[snake eater]

Re: boyesen reed valve question

Thanks for the help, I have no tried running it yet since the motor is in the middle of a rebuild. I'll see what I can do with that part number.

 

[mrcrabs]

Re: boyesen reed valve question

the stock air idle jet size is 36 which means I need a size 31

I think the the 31's were stock idle air jets in the early 70hp J/E

 

[snake eater]

Re: boyesen reed valve question

I Called all the evinrude / brp in Michigan, there seems to be no #31 orifice at all.They said that the #318823 doesnt work. The closest I can get is a #30 which should be fine In any case I can drill it out if need be.

 

[AlTn]

Re: boyesen reed valve question

Marineengine.com shows that part no, being an orfice, .031 0318823..$8.30...temp. out of stock..usually ships within 5 days...

 

[snake eater]

Re: boyesen reed valve question

Is it that the 0 has to be in front of 0318823? Because now when I search I can actually find them. Thanks for the help!

 

[mrcrabs]

Re: boyesen reed valve question

before you get all happy and order your jets you need to know for sure! which way your going with those jets, I did the boyesen dual stage reeds on my 70hp looper and my stock jets were #31's and Boyesen recommended #35's....I however used #33's with no lean sneeze. I think the rule of thumb on these idle air jets is that the larger the no. the less air to the fuel mixture at idle, as you go down in size with your jets you let more air in.

Check it out, do a search here at Iboats before you pay $8 a pop for jets you don't need.

 

[boobie]

Re: boyesen reed valve question

There's air jets and fuel jets depending on the carb/yr/model #. Normally the smaller the air jet the more fuel you get. On a fuel jet the larger gets more fuel. Again, depends on the carb.

 

[mrcrabs]

Re: boyesen reed valve question

everything I have read and been advised from boyesen was to reduce the size of the idle air jets for J/E...best advice is to call boyesen and get it straight from them or maybe wast ones time and money, lean jetting is quick death to fiber reeds. Ole Evinrude said, "excuse me a I need to sneezeeeeeeeeeeeeeeeee!" oops one wasted set of fiber reeds.