Author Topic: Jonsered 670 problem  (Read 383 times)

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Offline Loup

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Jonsered 670 problem
« 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 ;))

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Offline man of stihl

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Re: Jonsered 670 problem
« Reply #1 on: December 13, 2014, 06:04:11 pm »
Sounds like the chain is too aggressive? Or does the engine bog under load?
Ron

Offline farmboy

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Re: Jonsered 670 problem
« Reply #2 on: December 13, 2014, 07:14:11 pm »
Clutch spring could be weak.
Shep

Offline Loup

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Re: Jonsered 670 problem
« Reply #3 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.

Offline dutchsawdoctor

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Re: Jonsered 670 problem
« Reply #4 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  ;)
Best regards,Saul
Dolmar  Stihl Solo Husqvarna Homelite Ole-mac Echo Jobu Ridgid Poulan Remington Pioneer Partner ,Danarm stanley
more chainsaw repairs Oldtimer-Motorsägen  http://pily.strojevlese.cz / http://www.sauls-kettingzagen-site.nl

Offline Loup

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Re: Jonsered 670 problem
« Reply #5 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.

Offline aclarke

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Re: Jonsered 670 problem
« Reply #6 on: December 30, 2014, 01:03:52 pm »
Is the current air filter the "flocked" fabric over mesh?


Offline Loup

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Re: Jonsered 670 problem
« Reply #8 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 ?

Offline aclarke

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Re: Jonsered 670 problem
« Reply #9 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.

 

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