A few months ago I purchased a new JCB-PCS38 chainsaw in anticipation of a few trees that needed attention. I bought the JCB chainsaw because I thought it would be good quality with good backup.
I started it for the first time two weekends ago and it ran perfectly, for about 40 minutes. There was a tendency to stall if the throttle lever was opened too quickly, and then, whilst ticking over nicely, it suddenly died and wouldn't restart.
I've since discovered it will still start and run, but only on full throttle. It will not run at low speed or tickover.
I suspect a fuel/carburettor problem, such as a blocked idle jet.
As it is still under guarantee, I spoke to JCB who agreed there may be foreign matter in the carb. They seemed quite happy that I should have a look myself, which I'm prepared to do. However, when I asked for a workshop manual or exploded parts diagram, I was told there wasn't anything available. It also seems that very few spares are available, just air filters, chains and chainbars really.
I understand the carburettor is diecast aluminium rather than plastic like some I've seen. Also, the jets are crimped in and not removable, so a good blow-out with an airline seems appropriate. There are what appears to be three adjustment screws on the left-hand side, visible through holes in the yellow plastic casing. From memory, one is marked 'H' and another 'T'. I couldn't find out what these screws adjust - does anyone know?
Does anyone have experience of these chainsaws? Are workshop manuals and/or parts diagrams available? Are spares available - I imagine a new primer bulb will be a common requirement?
The chainsaws are made in China and I guess to an extent they are just a JCB colour coding and badging job. Are there other versions of this chainsaw around, sold under some other companies name, with maybe better documentation and spares backup?
Any help/advice appreciated.