High compression

[mickdundee]

I need to get my head round this 2 stroke stuff. I'm used to big dirty diesel engines. Sorry if you've answered these questions a million times before spud. It's much appreciated

[Eddy_t]

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:

 

 

You've over complicated it spud! Just tell them to stop being nesh, pull harder, faster and stronger!

[spudulike]

You've over complicated it spud! Just tell them to stop being nesh, pull harder, faster and stronger!

 

Yup, lift high and drop hard:thumbup:

[Dinosaw]

Spud, you're like Jesus in the desert sometimes. I know the problem, I have and old 036 that will also bite your hand off if you try a wimpy pull for exactly the same reason. Luckily it usually starts first time!

[spudulike]

Spud, you're like Jesus in the desert sometimes. I know the problem, I have and old 036 that will also bite your hand off if you try a wimpy pull for exactly the same reason. Luckily it usually starts first time!

 

See - old saw, fixed advance, hurting hand......pull hard......simple:thumbup:

[mickdundee]

Just for my own peace of mind. I've had this saw for 4 year. It had been running the day before. When this happened there was a very noticeable increase in effort required to pull it over from one pull to the next. So much so that I was worried if I'd tried to get it to go I'd probably have ended up snapping a pull cord.

I removed the plug this morning and tipped it up, nothing came out but it's had all night to dry out anyway with the exhaust off. So I'm going to put it back together shortly and see if there's any change. Hopefully it was caused by trying to compress petrol that had leaked in. The gaps seem ok at the flywheel and the coil.

Had a look on eBay last night and the same saws are all £100 more than I paid for this one so don't fancy replacing it. God knows whose paying that though, you can get a brand new echo for that sort of money with a 5 year home owner warranty.

[Macpherson]

Hi Mick, as you can`t find anything obvious I think your flooding Scenario is a good candidate, another similar thing to consider, which I get from time to time, is that when conditions are very wet the floss on the air filter can get a bit sodden just due to dampness or condensaton so the moisture being drawn in with the mixture on the first few pulls can make it feel like the piston`s hitting a brick wall, it can get very wet up here and I`ve got a couple of older 80`s Stihls which have pretty basic filters which can get very damp, just a thought, cheers.

[mickdundee]

It's alive

Thanks for the input everyone, I'm guessing as spud suggested fuel has leaked in causing high compression and now it's dry it's back to normal. If it happens again hopefully it'll be back up and running much quicker. On that note if this does become a recurring problem would that need a complete new carb?

 

Thanks again, Mick

[spudulike]

It's alive

Thanks for the input everyone, I'm guessing as spud suggested fuel has leaked in causing high compression and now it's dry it's back to normal. If it happens again hopefully it'll be back up and running much quicker. On that note if this does become a recurring problem would that need a complete new carb?

 

Thanks again, Mick

 

No, you just need a full carb kit - would recommend Rowena Motors for that being the UK dealership for all the main carb manufacturers on garden equipment plus you will find them a lot cheaper than Stihl who re-brand the Zama/Walbro kits.

 

It is the needle valve within the carb that can leak fuel through and does so on older machines. It is found under the metering arm!

[mickdundee]

No, you just need a full carb kit - would recommend Rowena Motors for that being the UK dealership for all the main carb manufacturers on garden equipment plus you will find them a lot cheaper than Stihl who re-brand the Zama/Walbro kits.

 

It is the needle valve within the carb that can leak fuel through and does so on older machines. It is found under the metering arm!

 

Top man spud thanks