Carburetor question 1976 johnson 15hp Model 15R76A

[kcrow]

So decide to rebuild my carburetor on the above model outboard . Got the kit cleaned it up and notice while taking the carb apart for cleaning that there was no "Bearing Needle Valve " part #20 on the carb diagram in place. After i reinstalled the carb i noticed that slow speed adjusting knob part # 13 did not sit flush up against the face of the motor. The only thing that changed was part # 13 the actual needle length comes in at appox 2.495 .Am i missing something here or has something been up graded though out the yrs . posted here b4 on timing and points setup .its all good..... that"s everyone who chimed in on that

 

[thumbnut]

My '76 does not have one and runs perfect. I think that bearing centers the needle taper to the center of the hole. Some other years do not use one.

Make sure that thingy is not still in the carb. I bought my '76 apart in a box. When going over the carb I found that bearing sideways with a hole through the side still in the carb.

 

[flyingscott]

The carb kit fits many different years of motors. Go on evinrudes website look up your model # and look at the carb breakdown.

 

[OptsyEagle]

I will assume you are sure the knob is pushed on as far as it can go. I would bet that, although you thought there was no needle bearing, there actually was one, and now there are two. Those needle bearings are really hard to see when simply looking into the slow speed orifice. The lighting will always be awful and they lack an identifiable color. I know my motor appeared to be missing one as well, however, when I straightened out a fish hook and probed it in there very delicately, one did end up coming out of the orifice.

 

[kcrow]

The knob is seated .As far as the needle bearing. Positive there is not two down there.But i do understand it is a bit of a pain to see. I could clearly see the seat or shoulder which would be part of the body of the carb.that the bearing seats into. So this motor is a 1976 i have owned it since 78/79 and never been into it the carb or really anything .There just was not bearing down there when i did the rebuild So i guess i'm asking this bearing does nothing more than to center the needle? it does"nt act as a seal? .I know thumb nut says his model did not have the bearing either Am i understanding this correctly?

 

[thumbnut]

Mine had one when new but I don't use one now. Just check some exploded views online for different years. You will see..

 

[oldboat1]

important thing is that the needle seats into the shoulder of the carb -- point will extend into the chamber in there, under the expansion plug. The expansion plug should come off and be replaced with the one in the kit, after cleaning under there. With the plug off, you can also see and feel how the needle seats. If your idle speed knob was not fitting, the reason is likely that the needle was not seated. That little bearing might have been intended to replace needle washers (not sure) -- would also see it as a seal. Assume you used the washers that came with the kit. Sometimes they can make it feel as if the needle is seated, when it actually isn't -- and if not seated, you will not be able to dial in the idle setting. But....can't tighten it down too much, or you risk breaking off the needle in the carb housing. Chances are, you have it right. When working right, the idle adjustment will be very sensitive, and a slight adjustment will affect operation.

 

[TN-25]

I have that exact same motor, but I have yet to get around to working on that one. I have the official 1976 parts catalog and it definitely shows "Needle Valve Bearing" as being present. It is listed as #20 in the diagram and is given as part # 314166. It is also noted as being included in the Carburetor Repair Kit.

 

[kcrow]

THANKS for all the responded. I will look at it a bit more. Someone had to be inside at one time or another .Like i said before when i got into it there just was no "needle valve bearing .