FS55 New Coil Backfiring through Carb

[mikerecike]

FS55 Strimmer 2006

 

Backfire through carb

 

Replaced a 4140 400 1303a coil with a 4140 400 1308 from ebay which allegedly replaces it. Great spark with plug outside cylinder but only backfires once through carb when rebuilt properly and won't run.

 

Is that a faulty coil?

[EricBradley]

That's correct it does replace the 1303, but i suspect its a Chinese one that wont replace anything other than a void in the scrap bin. Buy genuine they are for peanuts nowadays and be sure of quality.

[harrythecat178]

Assuming it has not got a broken flywheel key then its time to buy a genuine ignition module. Earlier FS 55's had the flywheel key in a different place and I suspect the chinese coil is for that application

[spudulike]

Some machines have a number of flywheel/coil combinations and have been here before. You must have a matching flywheel and coil combination and you may find Chinese coils, although said to be compatible, are far from that.

 

The main issue is on flywheel magnets that align to the coil but not at near TDC. I found on my machine (forget the model number) this happened well off TDC so had some sort of major advance or retard in the electronics - that is why it is backfiring - get the correct OEM part!

[mikerecike]

Thanks Eric, Harry & Spud - good stuff - was asking this for my mate (although I would've bought the ebay special too) good to know - much appreciated.

[mixedangased]

Yep wot they said ,ive tried loads of chineese coils all crap and fit for scrap !