Stihl 088 no spark

[sihart100]

Hi can any one help with my poorly 088?

 

It cut out on me mid cut as if was turned off while on full revs.

 

i checked and there was no spark so changed plug and still no luck so i ordered a new genuine coil from mister solutions, it came today and i fitted it but im still getting no spark! ive tried disconnecting cable on coil that goes to stop switch and still no luck.

 

is there anything ive missed or any recommendations on what to do next?

 

Many thanks Simon

[Rich2484]

The flywheel. Could have saved a few bob by asking mate.

 

Hd exactly the same and thought it was coil. Now have a spare coil on shelf. It was the flywheel magnets worn out.

 

You need a new one. Take it off and use a screwdriver against it, then use the screwdriver against another flywheel and you will feel the difference.

 

Of course this is on the understanding that all the wires and connections are ok. Better to check all these before going onto a flywheel.

[Rich2484]

Sorry I will start again.

 

First is to check all the wires and connections are ok. Start at the on, off, choke, switch. There is a metal plate with a wire on it, is this in good nick. The switch also has another wire, I'm sure it's brown, these two make a connection when in the off position. If you follow these wires one will be earthed to the saw casing, the other will go to the coil. If the wires have frayed or broken anywhere between the switch and the coil they will create and earth and ground the saw out stopping the spark. Once these have been checked and no wear is present on them, try disconnecting the could wire and check for a spark if it sparks there is a fault in the wires.

 

If this doesn't work then it's the flywheel at fault. I've had one last year do this and it's something like a 99.9% chance of the flywheel going but I had one go.

 

Hope the second post makes more sense.

[sihart100]

Thanks, thats what i was guessing as theres not a lot else to go wrong.

 

How hard is it to remove the flywheel? does it just unbolt or are any special tools needed?

[Rich2484]

Haha. Ok unbolt by locking the piston in place. There are a few tools to do this but using the pull cord method works well. Then undo the nut holding it on. Think it's left hand thread. I never really remember without actually doing it myself. There is a chuck key holding it in place. The flywheel will need pulling off. Spud has a very good screwdriver method for doing this but carefulness over being in a rush is best observed. The flywheel is only alu and will break very easily. It will pop off but again care is needed, can't stress this enough but as you are replacing the flywheel anyway it doesn't matter that much but as you are doing it for the first time it's good practise for any in the future.

 

Use a large flat screwdriver behind the flywheel and tap it in gently with a soft mallet. Try and work around the flyhwheel a bit and keep tapping send vibrations into the flywheel, it will work its way off or you will get one movement in it and it will fall off. Try and save the chuck key if it falls out.

[treequip]

Haha. Ok unbolt by locking the piston in place. There are a few tools to do this but using the pull cord method works well. Then undo the nut holding it on. Think it's left hand thread. I never really remember without actually doing it myself. There is a chuck key holding it in place. The flywheel will need pulling off. Spud has a very good screwdriver method for doing this but carefulness over being in a rush is best observed. The flywheel is only alu and will break very easily. It will pop off but again care is needed, can't stress this enough but as you are replacing the flywheel anyway it doesn't matter that much but as you are doing it for the first time it's good practise for any in the future.

 

Use a large flat screwdriver behind the flywheel and tap it in gently with a soft mallet. Try and work around the flyhwheel a bit and keep tapping send vibrations into the flywheel, it will work its way off or you will get one movement in it and it will fall off. Try and save the chuck key if it falls out.

 

That would be a woodruff key, a chuck key is for tightening or loosening a twist bit chuck on a drill

[Rich2484]

That would be a woodruff key, a chuck key is for tightening or loosening a twist bit chuck on a drill

 

Sorry my mistake yes a woodruff key. Don't know where chuck key came from. It's been a long day ok.

[Stubby]

I was trying to imagine the complicated form of the slot in the crank shaft and fly wheel to accommodate a chuck key ! rather than a standard woodruff key . Now its gone !

[spudulike]

Some saws need a damn strong pull to get a spark, the 066 is one of them! Try closing the gap between the coil and the flywheel to one thickness of A4 paper - pretty tight but may get the thing working again!

 

If you have disconnected the kill wire off the coil then it is most likely the coil to flywheel gap, the speed you are cranking at or the flywheel magnets!

 

The key in engineering terms is a woodruff key or flywheel key in engine terms:thumbup:

 

A chuck key is something found embedded in the ceiliing above the lathes at school:001_rolleyes:

[sihart100]

ill check the gap between coil and flywheel tomorrow, but by the looks of it ill be ordering a flywheel.