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  1. I

    Unable to start MS170 so advice needed for me to rule things out

    I started the saw up yesterday & there was white smoke. It did clear after a while but occasionally when I blipped the throttle I seen a bit more. This seemed to be by exhaust / chain. I fitted a new exhaust but it’s not that. This afternoon I started it up & let it get warm then adjusted the L...
  2. I

    Unable to start MS170 so advice needed for me to rule things out

    Flywheel arrived today. Whilst waiting for it to arrive i had a carb which was new but hadnt fitted or used BUT it did have the L & H jets. So adapted the saw to allow full access to these screws & also the tickover just below. Fitted the flywheel & the result is in the video clip. Just need...
  3. I

    Unable to start MS170 so advice needed for me to rule things out

    Ok thanks. Don’t want to break it off.
  4. I

    Unable to start MS170 so advice needed for me to rule things out

    Crank is fine so i assume spark doesnt fire at correct time, another flywheel has now been ordered
  5. I

    Unable to start MS170 so advice needed for me to rule things out

    The photo i supplied was taken from internet to show there isnt a separate woodruft key & is part of the flywheel as shown. I then took mine apart again & see photo of what i found. So i would say as i am getting a spark it isnt at the correct time hence why im having these issues. If key was...
  6. I

    Unable to start MS170 so advice needed for me to rule things out

    Hmmm On ebay & Amazon market is flooded with chinese copies even well known garden suppliers are selling chinese copies. Dont want another but what can i do as original is £££££££££
  7. I

    Unable to start MS170 so advice needed for me to rule things out

    What is the purpose of this item. It sits between engine block & coil. Surely without it the coil will still operate as the bolts mount flush with the coils metal part so shorting out isnt an issue. So assume for vibration etc ? Just trying to look at every possibility now.
  8. I

    Unable to start MS170 so advice needed for me to rule things out

    So just look for some photos and see that the key way is part machined in the magneto / flywheel.
  9. I

    Unable to start MS170 so advice needed for me to rule things out

    Question regarding key on crankshaft. I’ve just looked at old engine that I removed. The crank has a key way and nothing else. On car & bike engine there wood be a woodruff key that you tap into the key way on the crank. Is this the same situation for this saw or does the magneto have a...
  10. I

    Unable to start MS170 so advice needed for me to rule things out

    Haven’t done this but are you referring to whether the key is broken on crankshaft this timing out ? Engine is new. Obviously I’m using magneto from when it was stripped. I’m also going to remove exhaust and also both wires off coil. Unbelievable what an issue this has become. I understand...
  11. I

    Unable to start MS170 so advice needed for me to rule things out

    I will pop the flywheel off again to check. Tank breather I think is like a small rubber grommet with a hole in the top. Phone changed text. I said I used some carb cleaner down plug hole to rule out any issue with carb. I expected it to splutter to show a sign it was going to start but just...
  12. I

    Unable to start MS170 so advice needed for me to rule things out

    Just to add. Choke off & me not touching throttle lever at all I use carb cleaner in plug hole. Pull saw over and not even a splutter doing it that way. I tried this way to file out lake of fuel etc
  13. I

    Unable to start MS170 so advice needed for me to rule things out

    When I turn flywheel & I assume that where the coil talks with the magnet to generate the spark I do see the shaft turning with the but the same time as flywheel is being turned. When I took old one apart I did notice there is no way for it to fall out so as it all spins as opposed just one and...
  14. I

    Unable to start MS170 so advice needed for me to rule things out

    Throttle is wide open & new carb fitted same time with engine so no not at present
  15. I

    Unable to start MS170 so advice needed for me to rule things out

    I didnt try that because as its a new complete unit i didnt even try it Cylinder, Crank, Piston, Rings etc etc
  16. I

    Unable to start MS170 so advice needed for me to rule things out

    Plug out & with saw upside down pulled a few times but was dry from me leaving plug out all night. Screw all the way in as its left hand thread but not starting. Same again different plug but no change. Also did the same but with wire off coil just in case but still no change. This was done...
  17. I

    Unable to start MS170 so advice needed for me to rule things out

    Just typing as you replied. Brought saw inside house, nice dark room. I can see a spark. So carb is a pattern item as original was ££££ I don’t use the saw all that much but when I do i need it working and a £££ original doesn’t make sense. Pattern carb has left hand thread so all the way to...
  18. I

    Unable to start MS170 so advice needed for me to rule things out

    The photo shown was from internet as i put it back together. New carb was fitted same time as engine First post mentioned once running i would set this screw for tick over Why do you say not ignition ?
  19. I

    Unable to start MS170 so advice needed for me to rule things out

    Whilst im waiting i noticed when the choke is set to be on the flap isnt shutting 100% so ive bent the metal rod a touch so now it does.
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