High compression

[Stubby]

If it had gone backwards at start up spud ( I think that's what you meant if I didn't pull it hard enough ) how would I then correct that

 

Have a good breakfast then pull harder

[mickdundee]

Have a good breakfast then pull harder

why didn't I think of that

[Mark Bolam]

I've mackled my fingers on an old 064 many a time.

2 fingers either side of the grip now.

 

Don't know why it snatched like that sometimes, I'm no techno genius like Stubby.

 

 

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[Stubby]

I've mackled my fingers on an old 064 many a time.

2 fingers either side of the grip now.

 

Don't know why it snatched like that sometimes, I'm no techno genius like Stubby.

 

 

Sent from my iPhone using Arbtalk

 

I only know about breakfasts

[spudulike]

If it had gone backwards at start up spud ( I think that's what you meant if I didn't pull it hard enough ) how would I then correct that

 

I was describing the effect of the recoil starter pulling back on start up, using more welly on starting it is the answer if the machine is set up as it should be .

[spudulike]

I've mackled my fingers on an old 064 many a time.

2 fingers either side of the grip now.

 

Don't know why it snatched like that sometimes, I'm no techno genius like Stubby.

 

 

Sent from my iPhone using Arbtalk

 

I keep telling you, what is it aboout ignition advance and the effect of starting a machine with no retardation on the coil at start up is it that no one seems to understand:001_rolleyes:

 

The 064 has a FIXED ignition advance at around 25deg, if you pull the handle in a girly way, the engine will fire at 25 deg before the piston is at TDC and it will rip the starter from your little girly hands. You need to be manly and grasp the starter and yank the thing with conviction.

 

The MS660 has a coil that retards the ignition for an easy start and then advances it as needed for power and then retards for protection against pre-ignition at higher revs.

 

Got it:001_rolleyes:

[Mark Bolam]

Errrrr....

I think so Steve.

 

So Stubby was right then?

 

 

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[spudulike]

Errrrr....

I think so Steve.

 

So Stubby was right then?

 

 

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Yup, I taught him well - you are on the naughty step and he is top of the class....sorry - you have a long path to travel to gain the answers to your question despite my lessons:lol:

[Mark Bolam]

I'm off to start a thread on 'High Depression'.

 

 

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[spudulike]

I'm off to start a thread on 'High Depression'.

 

 

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No need to take it personally, it is all pretty simple if you think about it, I have just covered the subject sooooooo many times now it is becoming repetative but hey ho thats life!

 

Engines need ignition advance as the petrol vapour takes a little while to burn so the spark needs to happen BEFORE the piston gets to the top of its stroke.

 

Old saws have fixed ignition advance so are a compromise between being able to start them, make decent power and not die of high revs through pre-ignition.

 

Modern saws got clever with trick coils that spark with near zero advance when starting and then 30 degrees at idle, 20 degrees at mid revs and fall off to 10 degrees at maximum speed - completely different than four-strokes.

 

I have hours of fun in the workshop.....can you tell:001_rolleyes: