Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Dolmar Makita => Topic started by: ambull01 on January 20, 2015, 02:26:49 pm

Title: Makita 6421 Weird Noise?
Post by: ambull01 on January 20, 2015, 02:26:49 pm
Hello everyone,

Just heard about this site from a AS member. Figured I would post my question here as there seems to be less clutter vs AS.

There's a noise coming from my 6421 after I run it. Not real sure how to describe it, sounds kind of like air is either escaping or being sucked in. Is this common or should I check the impulse line?

I removed the carb and lines after buying the saw from HD to clean it. Some genius sprayed orange paint all over it with the filter cover removed! There was paint residue inside the carb. Saw runs great despite the noise and there's no difference in idle when I move the saw around while running.
Title: Re: Makita 6421 Weird Noise?
Post by: Cut4fun . on January 20, 2015, 02:31:43 pm
Tank vent?  Try when you get done running crack the gas cap and see what happens.
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 20, 2015, 02:34:49 pm
You know, that may be it. Damn I'm stupid. I saw some bubbling coming from near the fuel cap. Figured the cap wasn't tight enough.

If it's the tank vent, would I just need one of those duckbill type thingies to have a better seal?
Title: Re: Makita 6421 Weird Noise?
Post by: Cut4fun . on January 20, 2015, 02:56:03 pm
Been long time since I owned a 6400 7900 saw.   Doubtful duckbill thingy.  I could be wrong though.
Title: Re: Makita 6421 Weird Noise?
Post by: Cut4fun . on January 20, 2015, 02:57:17 pm
Dolmar Makita 6421 IPL    http://www.baileysonline.com/PDF/MKA_DCS642120_IPL.pdf
Title: Re: Makita 6421 Weird Noise?
Post by: Cut4fun . on January 20, 2015, 03:01:18 pm
@Nathaniel Vansickle  @166 @660magnum

2 of the above dolmar dealers.
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 20, 2015, 03:02:31 pm
Thanks for the IPL, don't know why I didn't think of searching for it lol.

So I may have to replace the Packing Ring. Or I could just leave the saw alone as it runs great and I'm splitting hairs again.

I'm hoping the PP375 runs with no noise once I order the carb kit and fuel line/filter.
Title: Re: Makita 6421 Weird Noise?
Post by: 166 on January 21, 2015, 12:56:58 am
That saw should have the new style vent. Sounds like a loose gas cap or damaged o-ring on the gas cap?
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 21, 2015, 09:38:40 am
The gas cap is a bit swollen so I have to use a wrench to get it on and off. Seems like all the caps I've seen swell up. My old Homelite's cap could never seat properly. I'll have to inspect the gas cap. I really hate the noise.
Title: Re: Makita 6421 Weird Noise?
Post by: 660magnum on January 21, 2015, 09:45:29 am
I have a couple 7900's with the same gas cap. Never any problem.

Could there be something different about your gasoline?
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 21, 2015, 09:49:02 am
So you don't have to use a wrench to get the cap on and off? BTW I would love to own a 7900!

Not sure about the fuel. How would that cause an issue? I fill it up with 91 octane 10% ethanol fuel. Only buy 1 gal at a time and use it all within a month.
Title: Re: Makita 6421 Weird Noise?
Post by: 660magnum on January 21, 2015, 10:26:18 am
Some plastic will swell with some gasolines . . .

One of my 7900's was originally a 6400 with the catalytic muffler.

I changed the cylinder/piston, decal, muffler/spacer, and installed a HD air filter.

(http://img.photobucket.com/albums/v11/jamesirl/Dolmar7900HDrtft-1.jpg) (http://smg.photobucket.com/user/jamesirl/media/Dolmar7900HDrtft-1.jpg.html)
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 21, 2015, 10:46:00 am
Is that the saw? Man that thing is sexy! No that can't be it, paint looks to perfect. I was hoping the blue would wear on me but I still think it's an odd looking saw.

Title: Re: Makita 6421 Weird Noise?
Post by: 660magnum on January 21, 2015, 10:57:08 am
Mine was a Dolmar 6401, I think that's the number, to begin with. It was orange from the factory. I bought from the distributor a 6400 with cat muffler and a 24" bar. Looking at everything, it left the factory with a 20" according to the sticker under the handle and the distributor exchanged the bars.

The chain saw was made in October 2010. In the 2011 picture it had only made a couple test cuts. It still looks that way except it has dust on it.

I have another factory 2006 7900 that I went in and changed all the little parts here and there to make it like a 2010 7900.

The ground for the ignition is different, the clutch has a bigger bearing, the chain catcher is a different shape, and there is a limiter cap on the upper AV spring.
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 21, 2015, 11:08:43 am
Oh I see. I thought the Dolmars had a different model number. I believe the older Makita 64cc saw was named 6401 and they had the non-cat/SLR or whatever it's called muffler. The 6421 mufflers have the added crap to them.

I should have just bought the Dolmar version. They're a bit more in price but look so much better.

You are too advanced for me, don't know half the stuff you just mentioned.
Title: Re: Makita 6421 Weird Noise?
Post by: 660magnum on January 21, 2015, 11:34:36 am
You have to take one thing at a time. We all had to learn too.

When you have a question, come on here and find the answer. There are some excellent people.

There's nothing wrong with a Makita. They are just blue / white instead of orange / black.

Many people like to put black covers on their Makitas.

(http://i29.photobucket.com/albums/c296/ebbemichel/DCS%207900%20N/HDFilter021.jpg)
Title: Re: Makita 6421 Weird Noise?
Post by: Nathaniel Vansickle on January 21, 2015, 01:24:44 pm
black covers look better. that odd grey makita uses is just ugly.
Title: Re: Makita 6421 Weird Noise?
Post by: Cut4fun . on January 21, 2015, 02:01:56 pm
Here is my makita 6401 = dolmar 6400  turned into a matika 7901 = dolmar 7900.

I was a fan of the new black tops with prefilters in them. I liked the muffler in black too. Not that it matters color.

Before in grey after in black.  Covers came from memeber 166 back in the day.
My local dolmar dealer couldnt help me out even when I had the part numbers in hand back then. 

(http://i59.photobucket.com/albums/g289/doemaster789/32bar20.jpg) (http://s59.photobucket.com/user/doemaster789/media/32bar20.jpg.html)

(http://i59.photobucket.com/albums/g289/doemaster789/Copyofblack7900003.jpg) (http://s59.photobucket.com/user/doemaster789/media/Copyofblack7900003.jpg.html)
(http://i59.photobucket.com/albums/g289/doemaster789/Copyofblack7900004.jpg) (http://s59.photobucket.com/user/doemaster789/media/Copyofblack7900004.jpg.html)
(http://i59.photobucket.com/albums/g289/doemaster789/Copyof375006-1.jpg) (http://s59.photobucket.com/user/doemaster789/media/Copyof375006-1.jpg.html)



Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 21, 2015, 02:41:24 pm
You have to take one thing at a time. We all had to learn too.

When you have a question, come on here and find the answer. There are some excellent people.

There's nothing wrong with a Makita. They are just blue / white instead of orange / black.

Many people like to put black covers on their Makitas.

(http://i29.photobucket.com/albums/c296/ebbemichel/DCS%207900%20N/HDFilter021.jpg)

Yeah there's lots of great info here. I have a lot of reading to do.
Title: Re: Makita 6421 Weird Noise?
Post by: ambull01 on January 21, 2015, 02:43:17 pm
Here is my makita 6401 = dolmar 6400  turned into a matika 7901 = dolmar 7900.

I was a fan of the new black tops with prefilters in them. I liked the muffler in black too. Not that it matters color.

Before in grey after in black.  Covers came from memeber 166 back in the day.
My local dolmar dealer couldnt help me out even when I had the part numbers in hand back then. 

(http://i59.photobucket.com/albums/g289/doemaster789/32bar20.jpg) (http://s59.photobucket.com/user/doemaster789/media/32bar20.jpg.html)

(http://i59.photobucket.com/albums/g289/doemaster789/Copyofblack7900003.jpg) (http://s59.photobucket.com/user/doemaster789/media/Copyofblack7900003.jpg.html)
(http://i59.photobucket.com/albums/g289/doemaster789/Copyofblack7900004.jpg) (http://s59.photobucket.com/user/doemaster789/media/Copyofblack7900004.jpg.html)
(http://i59.photobucket.com/albums/g289/doemaster789/Copyof375006-1.jpg) (http://s59.photobucket.com/user/doemaster789/media/Copyof375006-1.jpg.html)





Yep it really looks better than the gray covers. I was thinking about just spray painting the cover but not sure how well it will stick. Where did you get that massive pull cord handle?
Title: Re: Makita 6421 Weird Noise?
Post by: Cut4fun . on January 21, 2015, 03:45:59 pm
stihl 460 rescue handles is what I like. Form fitted to hands.  Were under $5.

 11281953401  1128-195-3401 for the stihl 460  rescue handles