Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Husqvarna => Topic started by: tassin85 on November 17, 2015, 04:48:25 pm

Title: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 17, 2015, 04:48:25 pm
hello
first sorry for my english, im french...
ive got a problem with my 51.
iddle is ok but in w.o.t. the engine's rpm go high and low like : RRRRRRRrrrrrrrrrRRRRRRRRrrrrrrrrrRRRRRRRRrrrrrrrRRRRRRR.
like a yoyo! if you know this word.

the carb settings are ok.
the air filter is clean.
the crank seals are new
the ignition is well set.
the fuel line is new.
intake pipe and seals are news
piston is nice with compression ok.

so what do you think?
air leak?
carb pb ?
fuel filter?
tank vent?

thanks for your help. im learning reading the forum.
Title: Re: husqvarna 51 wide open throttle pb
Post by: HolmenTree on November 17, 2015, 06:49:17 pm
Spark wire connection?
Plugged muffler screen?
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 18, 2015, 01:59:21 am
they looks good...the muffler is very old... im waiting for a new one.
what about carb gaskets? i don t know how old they are.....
how to check a flywheel?
the idle is perfect.... very strange...
Title: Re: husqvarna 51 wide open throttle pb
Post by: aclarke on November 18, 2015, 10:23:26 am
Tank vent?
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 19, 2015, 03:13:37 am
where is the tank vent on husqvarna 51 please?

Title: Re: husqvarna 51 wide open throttle pb
Post by: fisaw on November 19, 2015, 10:47:06 am
Did you pressure/vac test the saw , after repair ?    check the carburetor also. 
Title: Re: husqvarna 51 wide open throttle pb
Post by: aclarke on November 19, 2015, 12:59:27 pm
Tank vent is located on the right/rear of the fuel tank. It is a long plastic piece pressed into the highest portion of the tank.  You may need to remove the rear screws that hold the tank to the crankcase and lower the rear of the tank downwards to expose the vent. 
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 19, 2015, 08:48:14 pm
ok thanks i will try all the advices.
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 22, 2015, 07:50:48 am
hello
i ve remove the tank vent but impossible to blow inside.
i remove the white filter with a string, is ther a way to clean it. looks like sugar...
Title: Re: husqvarna 51 wide open throttle pb
Post by: Cut4fun . on November 22, 2015, 08:36:50 am
They are only $3 USD   501873101 

(http://www.jackssmallengines.com/graphics/e-pics/huskystd/large/501873101.jpg)


http://www.jackssmallengines.com/Parts-Lookup/501873101/616731/ps?gclid=CLvBlfOSpMkCFQaJaQod5iII_A

394 EPA (1998-03) Chainsaw 42 (1988-10) Chainsaw 42 (1992-03) Chainsaw 42 (1994-04) Chainsaw 42 (1994-12) Chainsaw 55 EU1 (2007-02) Chainsaw 55 Rancher (2007-02) Chainsaw 55 Rancher EPA (2006-02) Chainsaw 55 Rancher EPA (1998-08) Chainsaw 55 Rancher EPA (2000-05) Chainsaw 55 Rancher EPA (2004-01) Chainsaw 61 (1986-03) Chainsaw 61 (1986-12) Chainsaw   

Husqvarna 51 55 IPL  http://www.husqvarna.com/ddoc/HUSI/HUSI1991_AAaa/HUSI1991_AAaa_I9100014_.pdf
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 22, 2015, 09:17:39 am
Ok Thanks
Title: Re: husqvarna 51 wide open throttle pb
Post by: Cut4fun . on November 22, 2015, 09:38:38 am
You know if you can blow through the black tube without the porous white disc?   Put together and put some mix in it to see if that is it.

I had a race saw without the white disc and still needed more so just took small bit and drilled a hole at top of tank. For racing so it didnt matter.
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 22, 2015, 10:54:59 am
yes can blow without the white disc.
i think the white disc is defeckt.
Title: Re: husqvarna 51 wide open throttle pb
Post by: Cut4fun . on November 22, 2015, 11:06:04 am
Try running it if you can manage it without the disc in it. Just fill tank part way.
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 22, 2015, 02:43:27 pm
i will try this tomorow morning ! sunday its forbidden in France.
thanks a lot for your help!
Title: Re: husqvarna 51 wide open throttle pb
Post by: tassin85 on November 23, 2015, 04:10:04 pm
she runs like a clock!!!!!
thanks for your advices and help!
 ;D