Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Jonsered => Topic started by: shrek366k on July 07, 2014, 05:05:39 pm

Title: jonsered 49sp
Post by: shrek366k on July 07, 2014, 05:05:39 pm
I am frustrated with my Jonsered 49sp. I have had nothing but problems with it over heating on me with in five miniutes of running my saw an can not for the life of me figure it out. Can anyone help me I would greatly appreciate it thank you
Title: Re: jonsered 49sp
Post by: brokenbudget on July 07, 2014, 06:15:17 pm
how dirty is it? when was the last time you pulled covers off and cleaned it out?
how's the tune on it? is it running to lean?
what muffler does it have? square outlet on the clutch side or is it the 'louvered' front cover? louvered cover has a screen behind it that may be getting plugged.
what fuel, oil and mixture are you using?
any fins left on the flywheel?
Title: Re: jonsered 49sp
Post by: shrek366k on July 07, 2014, 06:54:16 pm
I clean my saw after every use I pull all the covers off and hit it with an air hose.I clean all the fins on the motor, I clean air filter after every use, I just rebuilt the carb replaced all the fuel hoses and I have cleaned the vent valve for the gas tank, I redid the coil gap and cleaned all the fins on flywheel. I'm running a fifty to one per one gallon with a sthil 2 cycle oil and 85 octain. It is tuned perfect I think lol it has never run this good but it will only run for five minutes and won't run for about half hour or hour depending on how fast it will cool down. But it runs great otherwise. I have been picking the small engine mechanics heads for two weeks now and I think they are sick of seeing me and not being able to help. And I have changed the fuel filter. I keep up on my saw because it has outlasted 6 Huskavarna 455ranchers in 3 years.
Title: Re: jonsered 49sp
Post by: Cut4fun . on July 07, 2014, 07:19:52 pm
Are you saying it is running good for 5mins or so and then shuts off?  Cool down and then starts back up in a hour or so?

 I dont know your saw at all, but sounds like coil or condenser going out if so. Had a 031 do this. It would go close to 30mins though.
Title: Re: jonsered 49sp
Post by: shrek366k on July 07, 2014, 07:32:05 pm
That is what I am saying since I've done all the work on it last weekend it had ran like it was brand new for five maybe ten minutes then starts to spudder and if you feather the triger a little you might get it to stay running but not for a minute or two then she off and can't getit started till it cools off. It also gets hot up on the motor cover and you can feel the heat on your hand even with gloves on. I don't get it.
Title: Re: jonsered 49sp
Post by: fordfairlane78 on July 08, 2014, 03:43:12 am
Have you always ran 85 octane?  Low octane will create more heat....
Title: Re: jonsered 49sp
Post by: aclarke on July 08, 2014, 09:14:25 am
What type of tank vent is it?  Some, especially the hose with a threaded screw tend to get worse with age and allow less venting. Adam
Title: Re: jonsered 49sp
Post by: aclarke on July 08, 2014, 09:16:21 am
As mentioned earlier, a plugged exhaust screen will create similar issue...
Title: Re: jonsered 49sp
Post by: shrek366k on July 08, 2014, 12:17:58 pm
I have checked the screen in the exhaust and it is clean. Yes I have always ran 85 octain in it an never had this problem. The vent for the fuel tank is threaded and looks like a nipple like on the carb its self. The vent for gas has a little ball in it and it moves freely I have cleaned it several times. I did not know about the octain. Not one of the mechanics iv talked to have said anything about running 89 octain.
Title: Re: jonsered 49sp
Post by: shrek366k on July 08, 2014, 02:09:36 pm
To be exact the vent on a 49sp is steal and almost an inch tall from the bottom of the screw to the top of the nipple where you connect the fuel tube to it and at the end of that hose is a vent that I just purchased Thursday of last week and had it checked Friday cause I still had fuel comming out of the gas tank vent when the saw is running. The mechanic I took it to said the vent was working properly. I never understand why the technical stuff is always for me but it takes talking to 20 to 50 people to get the problem fixed. So please if you read this an you have a slit inkling about what it could be please don't be afraid to post it even if you could be right or wrong. Please
Title: Re: jonsered 49sp
Post by: Cut4fun on July 08, 2014, 02:31:50 pm
I know different countries have different octane ratings.  Thats why I didnt bring it up.

Your IP comes back to Florida. How are you getting 85 octane?

Here in U.S. min 89 IMO and lot of saws say min 91 right in their manuals. 
87 here I was told by a old dolmar dealer creates to much heat. Even though folks still run it.
Title: Re: jonsered 49sp
Post by: Cut4fun on July 08, 2014, 02:40:17 pm
Jonsered 49sp 49 sp  IPL  http://www.jonsered.com/ddoc/JONI/JONI1982_AAaa/JONI1982_AAaa_I8200001_.pdf
Title: Re: jonsered 49sp
Post by: aclarke on July 08, 2014, 10:48:14 pm
Where are the high an low carb needles set from the closed position?
Title: Re: jonsered 49sp
Post by: shrek366k on July 10, 2014, 03:36:04 pm
The high is about 1 1/4 out, the low is 1 3/16 out. I have had two different mechanics look at them an I have them perfectly where they need to be. I also found out I had two small of a fuel filter and I changed it to a bigger one and changed fuel to 91 octain and a Huskavarna 2 cycle oil witch is for 2 1/2 gallons. So I mixed 2 cycle oil ta 2 gallons for a little extra oil mix. This is what my buddy runs and our saws love it. P. S. I live in Pocatello IDAHO.
Title: Re: jonsered 49sp
Post by: shrek366k on July 10, 2014, 03:41:16 pm
I live in Pocatello IDAHO. We have 85, 87, an 91 octain.
Title: Re: jonsered 49sp
Post by: aclarke on July 10, 2014, 04:26:06 pm
Test for spark after it dies to rule out ignition issues.  when it dies, does it quit cleanly or sputter and run rough? Adam
Title: Re: jonsered 49sp
Post by: aclarke on July 10, 2014, 04:42:25 pm
Went back and 're- read this.  Try running it again til it stops, then check for spark. I'm still thinking it's a fuel issue, vent issue. Run the Saw with the vent removed or crack the tank after the Saw dies and see if it will run again.   
Title: Re: jonsered 49sp
Post by: shrek366k on July 11, 2014, 12:20:33 pm
Last night I had ken at kens world look at my saw and he said everything was good until he started putting it back to gether and he noticed that the gasket in between the carb and intake is the wrong one. He said it was to small cause it was not covering a little part of the fuel intake so it was leaking gas and causing it to not run properly. So today I will find out if it is the problem or not. I will let everyoneknow if it is the problem or not. Thank you all for the help iI greatly appreciate it very much.
Title: Re: jonsered 49sp
Post by: shrek366k on July 11, 2014, 12:20:50 pm
Thank you to all, you have helped me out a lot.
Title: Re: jonsered 49sp
Post by: sharkey on July 13, 2014, 01:07:48 am
Im wondering if that gasket was blocking the impulse to the fuel pump side of the carb?  By using the choke you would pull only enough fuel from the tank for a couple minutes run time.  There would be a little more fuel coming from pressure in the lines from shaking the tank, but surely not enough for a couple cuts. 
Title: Re: jonsered 49sp
Post by: shrek366k on July 14, 2014, 12:54:21 pm
Well that was not a problem. The problem is that the new gasket for the carb and intake fit perfect. All holes lined up but the gasket was a little to small if you where looking at the intake manifold the left side is where the fuel comes from carb to intake. The gasket covered everything but about a 16th of where the fuel goes in to intake was not covered and leaking gas. Now my baby runs like a brand new saw and perrs like a kitten. I finally got it back together after completly striping her down and completely redoing and cleaning her she now roars like a lion and runs like a champ. Thank you all and especially ken at kens wrekworld for helping me.