Author Topic: My new to me Makita 6421  (Read 1958 times)

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Offline 660magnum

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Re: My new to me Makita 6421
« Reply #10 on: July 16, 2014, 12:01:25 pm »
I got the " H" needle free of epoxie using the dremel and Bernz-matic torch.
The L and H needle were in a alum block 1x1x1/2", that was held to the carb by the L needle. I had to remove a crimp from the L needle hole to unscrew the alum block.
With the block in a vice, I heated the epoxie until I could push the H needle out,
 along with the epoxie and spring. I cleaned up the mess and reassembled.  If the carb will ever work again ? I have yet to try. While the carb was out I did check the POP, over 20psi If that means anything. The needle valve worked as expected when I didled the fork.
Once I found out how to remove the carb, reassembly was a snap.

Some people feel that exerting 20-25lbs pressure into the carb to get regulator needle to pop-off the seat is putting undue pressure on the pump diaphragm.

I started just putting 7 lbs on the fuel inlet to make sure the needle is seated, then I will trip the needle and see that it re-seats itself.

To my surprise one carb wasn't holding pressure only to figure out that the pump cover was leaking around the edge.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

 

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