RESTO Mikuni Carburetor

[mikidymac]

Yank it like a tooth, you have nothing to loose now.

 

[Ckrawiec]

OK, that confirms that the tee is molded over the brass insert and the brass insert is pressed into the carb body. Judging by the Youtube videos for motorcycle or lawnmower fitting removals......a self tapping screw or hanger bolt driven into the brass insert then a spacer cup (like a socket) and a washer and a nut SHOULD PULL the brass insert OUT......

Hmmm, now I wonder out loud......could it be possible to tap a thread into that brass fitting (while still in the carb body) and get a threaded tee with barbed ends into it ????? Finding a tee like that though????? 1/4" threaded bottom with 1/4" barbed hose ends...does something like that even exist?

WELL now.....I just found a fitting (but I don't know if it'll work)....PARKER 1/4" barb x 1/4" barb x 1/8"MNPT brass branch tee. ZORO #G2555086, MFR #232-6-2....$6.47. The question is...is there enough meat in the brass insert still in the carb to tap a 1/8" MNPT thread into? IDK.....anybody willing to try it?

 

[Pope]

I'm doing the same thing with my carb right now. Let me share some of my mistakes....

The 1/4 barbed tee will hold 5/16 18 threads. I would remove the brass post that was pressed in and then drill out a 1/4" hole. You'll need a 5/16 18 bottom tap to get threads in the hole. I ordered one from Home Depot. I measured the depth that a drill could go without hitting the brass fitting at the bottom of the hole to be just more than 3/8". I drilled just short of 3/8" deep (using spacers like washers and sockets over the bit so that it could only go in that deep). Cut threads with a regular taper tap if you have it then just the bottom or just use the bottom tap carefully. Again....measure and mark just shy of 3/8" on the tap. Put threads and teflon on barbed tee and twist it in.

My mistakes so far..
1. Allowed the drill to wobble so my hole was wider at the top. Got a buddy with steadier hands to help me drill a bigger hole and use a helicoil.
2. Twisted the barbed tee too hard and broke it off in the helicoil.

Good luck!!

 

[Camgess]

So little update. Drilled it out with a 1/4 in bit. Tapped a thread into it using a 1/4-20 tap. Then threaded a 1/4 three nipple brass tee Using a 1/4-20 threader. Threw some gasoline resistant thread lock and boom. There she is. Ran it on a hose for 10 min no leaks. Good as new. The real test will be when it’s out on the water

 

[mikidymac]

You might have burnt up your driveshaft seal. Never run it on the hose for more than a minute or two since there is no lake water to cool it.

 

[Camgess]

You might have burnt up your driveshaft seal. Never run it on the hose for more than a minute or two since there is no lake water to cool it.

thanks for the warning. nothing seems to have gone wrong

 

[Camgess]

So I have an issue with leakage. Circled in red is the problem it leaks from the base of the stem. not sure how to go about fixing the leak. any pointers would be grate

 

[mikidymac]

Unhook the hoses and give it 1 full turn. They loosen up with age, just pipe threads.