Author Topic: My new to me Makita 6421  (Read 1119 times)

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Offline Philbert

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Re: My new to me Makita 6421
« Reply #10 on: March 25, 2014, 01:29:30 pm »
It's hit-or-miss, like Craig's List, etc.

I have see some for sale that were really beat up.  I have seen some that looked like great deals, but just did not need the saw, or did not have a way to get it home (airlines/TSA don't like them in your carry on luggage, and not always easy to prep them for checked luggage or UPS when you are traveling).

If you have local HD with rental departments, you can try to build a relationship with the rental managers to see if you can get a 'heads-up' when they will be turned over.

Philbert

Offline wudpirat

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Re: My new to me Makita 6421
« Reply #11 on: July 07, 2014, 01:36:21 pm »
I finally scored, after bugging the rental manager for almost three years, I got a Makita 6421.
It's not as pristine as the OP's, but in reasonal shape and cost a little more. I've bought worse.
Got it home and checked it out. Took the bar cover off and the chain looked funny, it was on BACKWARDS.
The red flag came up, what else was wrong?
The bar is a little beat, some small chips out of the edge, the old Nickelson mill bastard cleaned it up reasonable.
The rim sprocket was worn, poped the E clip and pulled the drum. Lots of rust, the bearing was frozen and the clutch threads rusted. They must have used a pressure washer to clean the saws.
Not a biggie, I've delt with worse. PB Blaster and some wheel brearing grease made it all better.
Time for a compresson check, first try, 80#, Scratch head, oh, the decomp was pressed. got it poped out.
Next try, almost broke my wrist, 170#,good to go, I would guess.
Changed the air filter, my spare was in better shape.
Checked out the carb, no H adjuster, the hole was epoxied closed. Now what? new carb?
Now how to deal with the cadillac converter, gut it or find a 6400 used?

All things cosidered, I felt I got my money's worth.
The high compression and the funkie carb kind of put the damper on my plans for an up grade to 7900. I have an OEM P&C on the shelf in antisapation. I don't think I want to install a BB without the ability to adjust the mix.
The biggie is what do I do about the carb?
Almost forgot, they threw in a spare new chain, made in Chi- hina of corse, more junk.
Always lookin to score free wood or chainsaws

Offline 660magnum

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Re: My new to me Makita 6421
« Reply #12 on: July 07, 2014, 01:42:58 pm »
Good score.

Use the Tri-Link Chinese chain on stumps?

Try to dig the epoxy out?

Show us a picture of the carb needles?
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 . . .

Offline wudpirat

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Re: My new to me Makita 6421
« Reply #13 on: July 07, 2014, 02:50:50 pm »
I tried to dig out the epoxie in the H hole. Some tough stuff. An Exacto knife wouldn't touch it.
Gonna have to use the Dremel with a small burr. Then what ?
The plan for now is to get it running for my Grandson Mikey, who brings me lots of wood.  He has on occasion borrowed my other 6400 when the wood got to large for his baby Stihl.
Hey Mikey, bring me any wood? No Grandpa, I need a bigger saw.
The 6400 or the 7900? How long a bar you gonna need? 24",28" or the 32"?
The 6400 and a 24" should do it, Gramps.
Oh, small stuff, just noodle it and don't bust a gut.
Oh did I mention, I love my Grandson Mikey and he takes care of his only Grandpa. Only wish my two boys were more like him.
Being 80 years old has some advantages.like napping while Mikey is still working. that kid is a moose, I used to be like that, I don't know what happened.  ;)

FREDM,  Oxford,CT.
Always lookin to score free wood or chainsaws

Offline 660magnum

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Re: My new to me Makita 6421
« Reply #14 on: July 07, 2014, 05:27:57 pm »
Me too. Grandsons help me a lot too.

That epoxy around the needle on the Dolmars has been done a couple different ways.

I have not personally seen it but one guy was saying the epoxy was in a tube affair and you could cut the tube loose at the base and let it all swing to adjust?

There was another one whereby there was more or less a dam or built up place around both needles but these had both needles epoxied.

My 6421 had a steel pin in the rubber boot between the HS needle and the outside adjusting hole. I just took the boot out and removed the steel pin. Put it all back together.
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 . . .

Offline fuzz1500

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Re: My new to me Makita 6421
« Reply #15 on: July 16, 2014, 10:58:16 am »
Great pics and info here ! 

Offline wudpirat

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Re: My new to me Makita 6421
« Reply #16 on: July 16, 2014, 11:26:43 am »
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.
Always lookin to score free wood or chainsaws

Offline KilliansRedLeo

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Re: My new to me Makita 6421
« Reply #17 on: July 16, 2014, 11:35:47 am »
First one I did took me a while to figure out you have to remove a pull out stopper at the back of the carb box to get a T-27 in there to remove carb screws.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

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Offline 660magnum

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Re: My new to me Makita 6421
« Reply #18 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 . . .

Offline Cut4fun .

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