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Final solution! Problem was discovered to be the fuel intake pipe/lead. It had sufferred deterioration in that it had gone "soft", and was closing/flatening causing fuel starvation.

Thank you bertsmobile1, upto now mixture appeared okay, not smoking once choke off (always off quickly). I have now fitted an aftermarket carb and is running but is now perhaps running too rich. My problem is that unlike the original Stihl carb which had philips type heads to adjust, the...

Sorry mate, I've only just seen your post.....but thank you for your input. I think I've done most of this, replaced the coil, plug and filter, no leaks, and adjusted valves. starts fine, but just starts to stutter and then cut-out after 5 mins - the fuel cap was replaced a while ago, and as...

Update: Valves adjusted, made sure it was TDC on right rev, not realy an issue there. So having checked the least costly alternative, will now move on to replacing the carb, as it is still cutting out when it gets hot. Thanks to advice from these guys, also some very helpful tips on Youtube...

Thanks guys. Weather & work got in the way, today I picked it up and hey presto primer was magically full, and started on 2nd pull. However, still stuttering & cutting out after 5 mins. Is it worth replacing the carb with an after market item available on the usual market places? Maybe also...

Well Ihope you're right............. Today I replaced the spark plug and fuel filter - now it wont start at all (unless I inject fuel direct into the cylinder). What I did first was the turn upside down and drain the fuel.. I hooked the fuel filter out and carefully removed the old one and...

Thank you for the explanation, makes a lot more sense. Lets hope its not the crankshaft! I will write a separate report on my misadventure with changing the fuel filter - below!!

Thanks for your reply. My ability to start fiddling with valve clearances is beyond me. however I am trying to understand the logic of how your diagnosis results in cutting out when the item is not on an even keel/under stress; incidentally it doesn't cut out immediately, it stutters...

Many thanks folks installed new coil, but still have the same problem!!! It is cutting out when in use, starts okay. It appears to work fine on bench both at idle, and at higher revs. I conclude that it is cutting out when twisting/rotating the trimmer in use (air filter has been cleaned)...

Thank you, best to have got a second opinion

As a newbie appreciate advice on my Stihl HL100. As I say its cutting out, and initial thoughts it might be the ignition coil (air filter is clean). the stampted on part nos are 4180 1305 A (2nd line MC 4180 B?), (3rd line JC 202 x) - numbers aren't clear. On the underside its says stihl...