Mikuni carb re-build

[philrock]

I'm re-building a Mikuni 34 mm gas carb to use on a Mc101.

What should the pop-off pressure be?

What should the fulcrum arm height be?

When I was cleaning the carb body, holding it upside down, a couple of small copper discs fell out. They are 1/8" diameter x 0.015 " thick. I can't figure out where they came from. Help!

[Rob Voska]

For gas I would start at 10. If it's fat on bottom raise it.
Arm? Usually for gas even with the floor on the carb but I use Tilly's & no expert on Mikuni's.
Washers came from under the brass needle seat when you removed it.

I also adjust arm heigth & pop off by needle settings. I don't like to run less than 3/4 of a turn ever on anything except a Yamaha. I will change the above to get needles in a comfortable setting area. 3/4 - 1 on H & 1 1/4 - 2 on low.

[Tom Luttenbacher]

The discs you are talking about came from under the fulcrum arm spring...its an E.C. Birt/Carbs/Dist set up. I would call E.C. Dist for the particulars. They did an Alky convertion for me on a 34 Mik and I found the same discs so I called and asked. Tom

[Rob Voska]

Tom's right & I was wr wr wro wr wrong. Was thinking of something else.

[louie figone]

Tom and Rob are right, they are spacers to fine tune the pop off pressure. 9 to 10 lbs works on the Mikuni and the large Tillotson on gas.

Louie

[philrock]

Anyone know what the fulcrum arm height should be?

[louie figone]

Flush with the body.

Louie

[Tom Luttenbacher]

www.eccarburetors.com/aka as EC Distributing/615-446-6807. Check out the site there are some great pics of karting and lots of other links. Tom L

[Tom Luttenbacher]

Dont include the "/aka" if you do an online search. TL

[philrock]

Guys - thanks very much for your help!!