Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Jonsered => Topic started by: Loup on December 13, 2014, 01:39:43 pm

Title: Jonsered 670 problem
Post by: Loup on December 13, 2014, 01:39:43 pm
Hello,

Today I had a problem with my Jred 670. First time I used it. Bought as second hand. Sound Ok, Idle Ok, speed Ok but the problem is the chain sometimes stop is the wood, specialy the knots, and the motor low down in rounds.

I did :

New fuel filter + New fuel hose
New Carb membranes (I touched the little throttle inside)
Repair admission pipe as I could (seems to be ok because Idle is Ok)
Changed old piston by a new Husqvarna 268 (same one)
Changed impulsion line by a regular fuel line with a little spring to old around the pin
Vent tank changed

Is the carb could be the problem (not enoughly gas) or the little throttle in the carb is too high ??

Thanks if you can help me.

(Sorry if I did mistakes with my english language, should be cool to correct ;))

Title: Re: Jonsered 670 problem
Post by: man of stihl on December 13, 2014, 06:04:11 pm
Sounds like the chain is too aggressive? Or does the engine bog under load?
Title: Re: Jonsered 670 problem
Post by: farmboy on December 13, 2014, 07:14:11 pm
Clutch spring could be weak.
Shep
Title: Re: Jonsered 670 problem
Post by: Loup on December 14, 2014, 07:41:46 pm
Quote
Clutch spring could be weak.

Don't think so because the chainsaw's motor doesn't go up in rounds. It's rather like if it bogged when it was needed extra torque or when I press 'a little) on.
Title: Re: Jonsered 670 problem
Post by: dutchsawdoctor on December 15, 2014, 01:38:15 am
chain should be ajust to the work you have to do ;D

time to make a video of it in a cut, i think we can help you a bit better  ;)
Title: Re: Jonsered 670 problem
Post by: Loup on December 30, 2014, 11:04:15 am
Hello all,

So I tried again with a new throttle in the carb with no change. But when I removed the air filter, hum, it was a lot of dust inside like it doesn't worked. It is the first air filter version upper and shorter dimensions than the regular on my 625. Which (670 air cover) is also hard to find here.
I removed the cylinder and, hell on earth, the sides of my crank was recovered by dust. I checked the piston. It has a little score on the admission side. So that's perhaps why this damn chaisaw bug, it badly digests dust.

I would like to know If I can set up an Husqvarna filter mount with a large air filter and another top cover. all with the less modifications. What model could fit on ? 372 ? 385 ?

Thanks if you can help me.
Title: Re: Jonsered 670 problem
Post by: aclarke on December 30, 2014, 01:03:52 pm
Is the current air filter the "flocked" fabric over mesh?
Title: Re: Jonsered 670 problem
Post by: aclarke on December 30, 2014, 01:15:34 pm
Aftermarket rescue "vent" saw set up on a 670

http://www.google.com/imgres?imgurl=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv661%2FXPLRN%2FChainsaw%252520Pictures%2FJonsered%252520670%252520Cutters%252520Edge%252520Saw%2FIMG_5458.jpg&imgrefurl=http%3A%2F%2Fwww.arboristsite.com%2Fcommunity%2Fthreads%2Fseeking-i-d-of-this-saw-seller-calls-it-a-cutters-edge.177268%2F&h=600&w=800&tbnid=IxQOo4db8t5ZMM%3A&zoom=1&docid=emhUAqkoJ_uhuM&ei=IOuiVIiMB4GvogTxgIHgAg&tbm=isch&client=ms-android-att-us&ved=0CCAQMygEMAQ&iact=rc&uact=3&page=1&start=0&ndsp=8
Title: Re: Jonsered 670 problem
Post by: Loup on December 30, 2014, 03:15:14 pm
My air filter is the nylon mesh model. It seems to be ok (no hole) but perhaps it is a little distorted by the basis and let the dust go inside the carb.

Cool 670 on your pics but idk where can I find the air mount and the air filter to convert mine. Besides the carb seems to be vulnerable to the dust with open cover. Is this air filter system ok with the rain ? It is able to everyday outside work or only once a while ?
Title: Re: Jonsered 670 problem
Post by: aclarke on December 30, 2014, 05:45:27 pm
Maybe buy another filter and swap  out every/ every other tank of fuel.  The 670 is known to load up quickly with dust, but I don't think it's a huge issue if you monitor the filter more often.
Title: Re: Jonsered 670 problem
Post by: Loup on December 30, 2014, 06:30:55 pm
I forgeted something : it did only one tank since I got it... with the air filter absolutly clean.
Title: Re: Jonsered 670 problem
Post by: aclarke on December 31, 2014, 01:51:30 pm
Sounds like something is wrong.  You shouldn't be getting a sizeable amount of dust through any type of filter medium
 
Title: Re: Jonsered 670 problem
Post by: farmboy on December 31, 2014, 10:49:39 pm
Is the rubber gasket under the air filter?  There is supposed to be one. You can convert it with to Husky 272 HD AF.  Will give you PN's tomorrow if you want.
Shep
Title: Re: Jonsered 670 problem
Post by: Loup on January 01, 2015, 01:08:08 pm
Quote
Is the rubber gasket under the air filter

There is.

Quote
Will give you PN's tomorrow if you want

Of course np.

Perhaps the 372xp HD air filter with the mount and cover will fit ?
Title: Re: Jonsered 670 problem
Post by: Spike60 on January 09, 2015, 07:50:32 am
The 670 is not "known to load up"; I don't understand why guys make statements like that. The stock air filter set up should work fine as long as the gasket between the filter and filter holder is there. That same set up was used on several Husky saws in this family along with the 288's. There is no need to upgrade to another system.

The nylon filters can often appear to be clean and free of sawdust, but the screen is still clogged. If so, the intake air will try and find it's way around the filter. Need to clean it out with an air compressor or gas and a soft brush. As bad as the dust was described by the OP, if it's not a missing seal, it could be a torn filter, or the two filter halves aren't fully closed and that might be a leak.

Here in the US, those filters are NLA in either flock or nylon style. However, the 266/288 filters will fit under the Jonsered top covers, so that's the only way to go.
Title: Re: Jonsered 670 problem
Post by: aclarke on January 09, 2015, 12:41:15 pm
Saws of this era had poor filtration systems with minimal surface area  (stihl, jred, husky) and lack of centrifugal separation.Here on the west coast It was common place to modify the Husky /jred of that era with aftermarket filtration systems that added surface area and increased the cleaning interval for logging operations.  The saw in your avatar as well as many commercially modified fire vent saws used aftermarket filter systems for this reason.
Title: Re: Jonsered 670 problem
Post by: SawTroll on January 09, 2015, 05:19:16 pm
Saws of this era had poor filtration systems with minimal surface area  (stihl, jred, husky) and lack of centrifugal separation.Here on the west coast It was common place to modify the Husky /jred of that era with aftermarket filtration systems that added surface area and increased the cleaning interval for logging operations.  The saw in your avatar as well as many commercially modified fire vent saws used aftermarket filter systems for this reason.


I have some times wondered how much that really helped in the long run, considering the time spent when you finally had to clean them, versus how fast it was to clean the original mesh filters?   ???
Title: Re: Jonsered 670 problem
Post by: aclarke on January 09, 2015, 05:59:10 pm
Likely no time saved, just buying a few hours til the inevitable...

Title: Re: Jonsered 670 problem
Post by: Spike60 on January 11, 2015, 09:16:16 pm
Saws of this era had poor filtration systems with minimal surface area  (stihl, jred, husky) and lack of centrifugal separation.Here on the west coast It was common place to modify the Husky /jred of that era with aftermarket filtration systems that added surface area and increased the cleaning interval for logging operations.  The saw in your avatar as well as many commercially modified fire vent saws used aftermarket filter systems for this reason.


In that context I agree with what you are saying. I thought that your earlier post singled out the 670 as being worse than similar models of the period, and that was the point I was contesting. (or thought I was)

I recently discovered that Cutters Choice, who still makes those Fire Vent saws from the 2166/2172 has quite a dealer network and those air filters and parts are easily accessible in most areas. Also, most of the filters have been redesigned and are now "non-crushable" unlike the one in my avatar. And they don't cost any more than the standard filters.