Author Topic: makita 6421 adjustment  (Read 523 times)

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Offline Thomas Barber

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makita 6421 adjustment
« on: July 10, 2015, 05:18:41 pm »
I have a 6421 Makita when you are making a cut it sounds like your hitting a rev limiter. Is that a carb adjustment ? I did manage to clean all the epoxy from the carb . But I didnt want to screw with it yet.
Makita 6421

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Offline 660magnum

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Re: makita 6421 adjustment
« Reply #1 on: July 10, 2015, 07:10:37 pm »
The 6421 is rev limited via the ignition coil
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Offline Thomas Barber

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Re: makita 6421 adjustment
« Reply #2 on: July 10, 2015, 11:10:11 pm »
can that be adjusted buy tuning the carb ?
Makita 6421
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Offline man of stihl

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Re: makita 6421 adjustment
« Reply #3 on: July 11, 2015, 05:30:50 am »
can that be adjusted buy tuning the carb ?
No.
 
Ron

Offline 660magnum

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Re: makita 6421 adjustment
« Reply #4 on: July 11, 2015, 05:53:48 am »
I have a couple 7900 Dolmars and they are the same family as your  Makita 6421. I keep the 7900 saws rich enough to where they never get to the rpm limiting function of the coils.

My older son and his friend used them to reduce a huge ash tree a few weeks ago and I never heard the saws go into ignition limitation?
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Offline Cut4fun .

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Re: makita 6421 adjustment
« Reply #5 on: July 11, 2015, 10:21:23 am »
Fatten the saw up WOT to where it isnt hitting limiter or tune in the wood.  Pick one
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Online jmester

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Re: makita 6421 adjustment
« Reply #6 on: July 11, 2015, 10:23:03 am »
I have found that saws with limiters are easiest to tune in the cut.
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Offline Eccentric

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Re: makita 6421 adjustment
« Reply #7 on: July 11, 2015, 04:00:36 pm »
Tune it in the wood for sure.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline Thomas Barber

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Re: makita 6421 adjustment
« Reply #8 on: July 11, 2015, 04:03:17 pm »
ok will do . Thanks for all the replies.
Makita 6421

Offline Thomas Barber

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Re: makita 6421 adjustment
« Reply #9 on: July 12, 2015, 10:20:32 am »
I sharped the chain and tried it again it runs great
Makita 6421

 

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