75 50Hp Evinrude Sizzler carb. rebuild ?

[bkeith66]

Hello,

I'm in the process of rebuilding the carbs on the mentioned outboard. Picked up Sierra carb kits (#18-7042). Everything in kit matches up with the exception of the bearing needle valves. The old ones are reddish in color & fit in the slow speed needle valve hole easily. The new ones are white & wider due to a tapered big end. Seems it would take a good amount of force to get the new one down into the hole. Forcing anything on a carb seems like the wrong thing to do. Hoping someone can tell me whether this is the right replacement bearing to use. Below is a pick of the old & new bearings side by side. Thanks for any help!

Motor Model# 50543B

http://xs.to/xs.php?f=DSCN0357.JPG&h=xs208&d=06431

Brian

 

[OBJ]

Re: 75 50Hp Evinrude Sizzler carb. rebuild ?

They should be tight Keith to help form an air tight seal around the needle and hole. OEM needle bearings are tight also. Use a little lube like TCW-3 on the bearing to help get it in. A drop on the needle will also help when screwing the needle in.

 

[Chinewalker]

Re: 75 50Hp Evinrude Sizzler carb. rebuild ?

Hi Brian,
Yes, they are supposed to be tight. The originals get hardened from the fuel with age and lose their ability to seal.
Got a new project? I thought your 16 American had a Merc on it? Had it out much? I'm still plugging away on my 18-footer. Got one stringer left to install, then the floor and deck... Not gonna get it wet this year, though...
- Scott

 

[bkeith66]

Re: 75 50Hp Evinrude Sizzler carb. rebuild ?

I appreciate the help! Pushed it in there with a little lube. went down easier once past the first couple threads.

Hello Scott,
This motor is off a 16' aluminum lund fishing boat that i've had for several years. It's been running a little rough at low speeds. Hoping rebuilding carbs will help.
Haven't had a chance to get the american out again. Gonna have to wait for spring now. Looking forward to figuring out the porpoising issue & just getting everything else dialed in.
I remember how relieved i was when the last stringer was complete. Almost shed a tear d
Looking forward to seeing more18 progress pic's.