Author Topic: makita 6421 adjustment  (Read 523 times)

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Offline dannyupsolate

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Re: makita 6421 adjustment
« Reply #10 on: July 13, 2015, 12:52:53 am »
there may be mixture limiter caps on your carb they are  pollution control.  Many people find a way to defeat the mixture limiter caps to get the mixture rich enough for a long life saw .the rev limiter is electronic inside the coil. thanks for all your hard work on a great distro Thomas

Offline 660magnum

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Re: makita 6421 adjustment
« Reply #11 on: July 13, 2015, 01:22:08 am »
Depending on what year they were made, some of these had the needle valve cavities filled with a metalized epoxy where you couldn't adjust the needles. You had to buy a new carb.

Most had tabs on the needle valves that could be removed.
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