Jonsered 630 Super II. Cutting out issue

[champagnecharly]

Seem to be having problem with my 630 Super 2.

Starts ok. Runs for a couple of mins from cold but then cuts out.

Restarts easily (ish) and runs for 1 to 10 sdeconds before cutting out again.

Fuel hose is new. Tried with and without fuel filter no difference. Stripped carb (which was pretty clean) and cleaned it in ultrasonic cleaner. All gaskets seemed fine and soft/flexible and came off easily with no damage. I put same gaskets diaphragm back as they were hardly used since last overhaul.

One thing I noticed when plug unscrewed was that i did have to pull hard to get a good spark. I'm wondering if the coil may be failing/becoming weak. But then why would a little bit of temperature from running just a couple of mins change the same? Or do you think that is point more to seals. Unfortunately my vacuum pump I purchased just 8 months ago is useless. so I cant test vaccum. Compression should be just fine though given it's easy to start.

Anybody any thoughts?

[cornish wood burner]

Had various electrical kit failing when hot. Used to be a favourite with coils, and condensers on the older cars.

[peatff]

Check the coil to flywheel gap.

[spudulike]

Check the fuel tank vent as well as the previous idea, I had a 630 with similar, try running it on its side with the fuel cap loose to see if it is the tank vent.

[champagnecharly]

Hi,

 

Thanks guys. Not checked clearence but have no gauges to ensure exact clearence.

Tried removing fuel cap and running on side (making sure that hose/filter in juice) and stalled.

 

What is strange is that this time from cold it didnt even run 1min before cutting out. So minimal heat produced. But it starts (nearly) every time on first pull.

[champagnecharly]

With regards the vent... i'm wondering if that isnt on best form also.. after running i hear a faint whistling from it until i take off the cap. Or is that normal excuse my ignorance.

[champagnecharly]

Ok.. Well no gauges but a bit of glasine paper probably around 90microns between magnet and coil.. (mostly) starts a little easier but still same issue again with fuel cap off. However i did notice that when it doesnt want to start it needs a more forcefull pulll. However coil that is on it is 503 62 02-03 and not 503 62 02-02.

[adw]

The 630 was basically the Husqvarna 162, the later model has a single piece ignition unit, this seems to be what you have, the air gap should be 0.3mm, however it was not the best ignition unit out there so this is sounding like an ignition issue, i can probably find a unit for you to try, at least it would rule out the unit. To clean the carb properly you really need to remove the core plug covering the main jet screen.

[champagnecharly]

If you could that would be fantastic! I'm finding it hard to find a coil that looks the same. I.e that has a separate earth wire.

 

Sods law i think I threw my welchplugs and dont have proper shaped tools to put one back... COrrection.. I was thinking of the welchplugs on stihl strimmers and the strange shape the zama have.. New kit purchased just to be sure.

Edited April 25, 2015 by champagnecharly

[champagnecharly]

Does it make a difference if it has the earth ( ipresume its earth) wire coming off the ignition. Searching i found a replacement part which in urn lead me to:

Ignition Coil fits Husqvarna 50 51 55 61 254 257 261 262 266 268 272 544018401 | eBay