Boysen reeds in my 1977 johnson 115

[marshasman]

I just ordered new boysen reeds for my 1977 johnson 115, i have been reading threads about changing the jets in the carbs, could someone please advise me on this.

 

[iwombat]

Re: Boysen reeds in my 1977 johnson 115

You need to fatten up your jetting on the low end by a couple of sizes. You have fuel jets and not air jets (like the later models) so you need to go up in size.

 

[marshasman]

Re: Boysen reeds in my 1977 johnson 115

Should I go up 2 sizes? And it is the jets on each side of the carbs right? Thanks

 

[iwombat]

Re: Boysen reeds in my 1977 johnson 115

I'd go up two, and they're on the side of the carb body. The main jet is on the side of the float bowl.

(part #40 on the OEM parts diagram)

 

[marshasman]

Re: Boysen reeds in my 1977 johnson 115

Ok, i Pulled the jets out, they are marked 29, so I need 31? Plus what about drilling them out? We use to do that on our race engines! If so I would drill it out to .310mm right? Or are the jet numbers different on these carbs? Or would it just be best to buy new ones? I just don't want to put a bunch of money in a 28' party barge that just goes to a cove and drops anchor! Lol I just want it to start and run good! Thanks again..

 

[iwombat]

Re: Boysen reeds in my 1977 johnson 115

You _could_ drill them out, but they're not very expensive to buy new. You spent a lot of money on your new reeds, it'd be a shame to blow them out with jets that lean sneeze.

 

[marshasman]

Re: Boysen reeds in my 1977 johnson 115

i have been looking for the jets a few sizes up, the only one i can find is a #33 part #0320015, the factory ones are #29 part# 0322776. i am still looking.

 

[marshasman]

Re: Boysen reeds in my 1977 johnson 115

would the #33 be too big? there is no idle adjustments on these carbs either.

 

[iwombat]

Re: Boysen reeds in my 1977 johnson 115

I'd go with the 33 and keep an eye on the spark plugs. They'll tell you if it's too fat. Error on the side of fat when setting up the new reeds.

 

[marshasman]

Re: Boysen reeds in my 1977 johnson 115

i think i found the right ones, #31 part number 0318823, or #32 part number 0320016? this is too crazy for just changing reeds!

 

[marshasman]

Re: Boysen reeds in my 1977 johnson 115

I just ordered the #33's, i will let you know how it works! Thanks iwombat

 

[iwombat]

Re: Boysen reeds in my 1977 johnson 115

It's like doing any engine mod. You can't just change one thing out and expect things to work together properly. Those reeds are really quite different than the stock metal reeds. The stock jets will cause lean sneezes and will blow them out, then you're stuck replacing those brand new reeds.