Evening all
I had an interesting issue with my beloved Ryobi Full Crank trimmer last weekend.
I used the chainsaw pole attachment and did some pruning (up to 5 inch diameter at times), cut up (with help of Victa saw) and ¾ filled a council skip (in between a hundred other things)
Went through 700ml of fuel over the weekend to give an indication of how long it went.
Starts first pull (honestly, both of this model I have do it regularly), has new lines, diaphragm and primer, clean filter, etc. Spark plug cleaned approx. 1 hr use ago. Running 45:1 (50:1 plus tiny bit)
Ran perfect, was doing 20 minutes on, 10-20 off whilst I was carting and chopping into smaller bits.
The problem arose when I did the front tree. Once I hit 35ish mins of running (idle and flat out) it would spontaneously stall at idle. Would restart easily though. Did it 2 times, but ran perfectly, didn’t feel hot. 3rd time it died and wouldn’t come back. 20 pulls, only the occasional splutter. Removed plug (don’t normally on a hot engine but when the suns setting and you want to finish…) put another in and it went.
First go ran fine till finish. Started next morning 2 pulls, ran fine 35 minutes, then a repeat stall, but this time I had to shut it off after 35 so didn’t see it completely die. I always idle for a minute as a cool down and it didn’t stall.
My realisation of my possible mistake came yesterday whilst sorting spark plugs. I came across a CJ4 plug and wondered what a cj4 would come out of. Then remembered a mates identical Ryobi had this plug in originally. He said it was factory original. Then checked my other identical model and it is also cj4.
The one I was using has a cj6y in it (was new when picked up at the tip)
Do you guys reckon the cj6y (with higher heat range and extended hotter running electrode) practically cooked itself in the flat out high stress running?
At the time I thought it was fouling the plug, but I think I was wrong.
Thanks
