Husqvarna 435 wont start driving me nuts

[CEE]

Yes @adw fair play you did pick out the coil 

[CEE]

I know I am being a grumpy old man but I still think that for a premium brand charging premium money It’s poor to fail like this.

 

the coil has no moving parts and doesn’t get desperately hot - I am sure they could have specified a more reliable one if they wanted

 

ive bought a £10 amazon replacement - it will be very interesting to see if it lasts longer than the OEM one

[bmp01]

7 hours ago, CEE said:

I dont know how this is happening becuase you can see the spark on the spark plug when it's grounded and I tested the coil at be 0.5 Ohms (the spec) and I have got a 0.3mm feeler guage and set the air gap...

Firstly, well done in sorting it out and not giving up. 

 

WRT seeing a spark, that goes to prove the test isn't adequate.  As stated earlier you need to get a spark to jump 4 - 5 mm in free air to be confident there will be a spark in the cylinder with compression. And when the coil and ht lead is put under load you might find the insulation breaks down somewhere in side the coil or through the side of the ht lead.

Or it might be the spark is good but the coil timing gone for a poop.

 

Anyway, it's the result that counts,  nice one. 

Edited September 24, 2020 by bmp01

[Dan Maynard]

Ah that's great, and thanks for posting the update, one for the rest of us to file away in the ol' memory banks in case we get something similar.

[peatff]

Never had it with a saw, the coil either works or it doesn't but I did have the same problem with a 2 stroke scooter which was also fixed with a cheap eBay coil. It would actually tick over for hours and rev for about 20 seconds which made it look like a fuel problem.

[Stubby]

15 hours ago, CEE said:

 

 

ive bought a £10 amazon replacement - it will be very interesting to see if it lasts longer than the OEM one

Could well have been made in the same factory as the OEM one on your " semi pro/home owner " saw .  Edit .. Sorry not meant to diss the level of saw just pointing out that the manufacturing costs will have been kept down compared with , say a 550Xp

Edited September 25, 2020 by Stubby

[CEE]

Yes @Stubby you are quite right could well have been made in the same factory !

no problems I’m not a professional user

[CEE]

Hold the phone

 

now runs like a dog it backfires and dies when you touch the throttle (although it’s not idling properly anyway) doesn’t get up enough speed to engage the clutch

 

ive changed the carb - I now own 3

 

ive changed the plug

 

i have taken off the flywheel and made sure that the keyway is intact which it is and done the flywheel back up to the required torque

 

ive checked the air gap

 

ive changed the fuel - again

 

when turning it over by hand with the plug out a puff of smoke comes back out of the air intake on each downstroke of the piston

 

back to square 1

[CEE]

The backfire is a big backfire 

[gary112]

12 minutes ago, CEE said:

Hold the phone

 

now runs like a dog it backfires and dies when you touch the throttle (although it’s not idling properly anyway) doesn’t get up enough speed to engage the clutch

 

ive changed the carb - I now own 3

 

ive changed the plug

 

i have taken off the flywheel and made sure that the keyway is intact which it is and done the flywheel back up to the required torque

 

ive checked the air gap

 

ive changed the fuel - again

 

when turning it over by hand with the plug out a puff of smoke comes back out of the air intake on each downstroke of the piston

 

back to square 1

Oh dear you not having much luck,get another saw if i was you