Recent content by Newto2stroke

Bob, Ebay flywheel did not work so Mr Ebay accepted it back.I rehashed old flywheel and fitted it; ground off concentric fan blade to broken fan blade. Wheel balanced. A good fit and Bingo. So I’m happy man. ps. there is a very small unnoticeable difference in flywheels as I see. Putting the...

Complete and total success. My MS391 starts first time, and runs smoothly🥳. I’ve started it over 3 days and works every time.

Yes of course Bob, it’s all about timing. I told you I over thought the problem. The subtleties of parts matching may be beyond my skill but I’m on the case. I work to nano metres. I will try to spot any small angle difference in the key position wrt to sharft. I’ll make a mark from the old...

Great advice Bob. I will do as you say and shape the concentric fins to balance the wheel. I‘m sure there will not be a serious reduction in air flow as a consequence. It’s a cost benefit I suppose; balanced wheel versus air flow. Unbalanced wheels spinning at 12,000 rmp takes the cake on that...

i have got the machine running really well now. It feels powerful and responsive, all my hard work paid off until the flywheen key sheered. Oh dear, never mind, an ebay flywheel in on route to me. all my hard work had paid off.

Bob, there are flywheels new £100+ from suppliers or EBAY 2nd hand £30. I found one for an MS362C which looks the same. see photos. What do you reckon? my fly first first 2 photos ( broken pin and one fin missing) and then EBAY two photos, to compare. They look identical. The only difference is...

Well Bob, came down this morning, having left it last night, went through the start up sequence and she started like a dream. So everything I had done was correct. loads of power and everything works. After 20 mins, the flywheel pin sheered🤪. but at least I know I can replace that flywheel and...

Bob, a little progress. Going back to basics, reading the on line operational manual, I tried to start it as detailed. Full choke until it caught (7-8 pulls). Then to half choke and it fired up after 2-3 pulls. It ticked over in half choke then I move it to normal running and it ticked over...

Bob, thanks for more info. Yes spark ok (see later), compressions ok( holding pull string and machine does not drop), Dirko ok, very fresh 40:1 fuel mix. So for timing…Due to a good spark, magneto gap is good and since I replaced bearings, the crankshaft spins concentric so ignition coil is...

Thanks Bob, well I’m just far enough outside London to a tree🤓. London is a big place. and I have a wood burner and a car😂. This red stuff (Dirko HT), supplied by Stihl. Squeezed it along the bottom half of the crank case, there is a groove, and when two halves go together it seals, as...

Hi Experts. I‘m not new to chainsaws but I‘m new to fixing them. I need your help please!! My story: I bought my Stihl MS391 2nd hand and within a few uses it started to behave badly (first mistake but we all learn) It wad sluggish, cut out and no chain oil. So I decided to learn about it...