Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Dolmar Makita => Topic started by: Cut4fun . on November 06, 2013, 02:14:16 pm

Title: Dolmar 6400C
Post by: Cut4fun . on November 06, 2013, 02:14:16 pm
Does the C on the dolmar 6400C just mean it has a catalytic muffler on it? 
Title: Re: Dolmar 6400C
Post by: Cut4fun . on November 06, 2013, 03:08:27 pm
Looking to help a guy out that dont want to mod the Cat muffler.  Anyone have a dolmar 6400 7300 7900 muffler to sale?  makita 6401 7301 7901 also.

Found some for him at Chainsawr  http://store.chainsawr.com/search?q=dolmar+6400+muffler   
Anyone else?
Title: Re: Dolmar 6400C
Post by: 660magnum on November 06, 2013, 03:16:49 pm

AFAIK, the "C" just means catalytic muffler which is rather heavy
Title: Re: Dolmar 6400C
Post by: Treemonkey1000 on November 06, 2013, 08:03:03 pm
Thanks guys I'm the one trying to find out. I agree the saw is a bit heavy not sure if it is just the cat muffler. It is a great saw and cuts like crazy. Now that it is past warranty I figure I would look into opening it up a little. I may just pop the muffler off and see what it would take to "fix" it.
Title: Re: Dolmar 6400C
Post by: Cut4fun . on November 06, 2013, 08:12:32 pm
Does anyone know if the NON  CAT   muffler will bolt right in place of the CAT muffler. Just the muffler support bracket on the C version will be left off with the older style muffler?


Welcome Treemonkey1000   8)
Title: Re: Dolmar 6400C
Post by: 660magnum on November 06, 2013, 08:15:26 pm
This is a picture of my 6400 with the catalytic muffler. Take notice of the muffler brace and the little hole stuffers in the bolt holes.

(http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=2520.0;attach=4257;image)
Title: Re: Dolmar 6400C
Post by: 660magnum on November 06, 2013, 08:20:50 pm
This is the same chainsaw with a 7900 OEM jug and a regular 6400 muffler.

To change the mufflers, you have to order the top spacer and bolt for the early 6400 muffler.  You cannot use the brace with the old regular muffler.

(http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=2520.0;attach=4259;image)
Title: Re: Dolmar 6400C
Post by: 660magnum on November 06, 2013, 08:29:46 pm
To open up a cat muffler you have to grind the edge of the seam off to get to the insides . . . Then weld the muffler back together.

All the insides of the muffler should be cleaned out and a second external port added on the other side of the muffler.
Title: Re: Dolmar 6400C
Post by: Cut4fun . on November 06, 2013, 09:12:36 pm
Thanks Jim.  Thats the info I was trying to dig up for him.
Title: Re: Dolmar 6400C
Post by: Treemonkey1000 on November 07, 2013, 02:33:08 pm
Thanks again guys. 660 did you open up that muffler before installing it? I am guessing just removing the restriction of the catalytic converter may allow it to breath a good bit better. I think I may just have to try the new muffler rather than trying to cut apart the cat muffler and welding it back together.
Title: Re: Dolmar 6400C
Post by: farmboy on November 07, 2013, 03:40:00 pm
Haven't seen a Cat muff up close & personal.  I heat the seems where the two halves come together and unfold the lap.  Cut the junk out heat seem and refold no welding necessary.  The Cat muffler looks like it's put together the same way.  While you have it apart grind out everything under the deflector to open it up.  IMO unless it's ported that is all the mod you need on 6400.  Keep checking Ebay the old non Cat mufflers pop up ocassionally. 
Shep