echo 280wes cutting out at full revs.

[Ty Unnos]

Hi

 

Our three month old echo 280wes has started cutting out at full revs.

 

It has be running fine up to now.

 

We run it on Aspen and it has never had a problem.

 

Then on Monday it just started dying.

 

It starts and idles and revs fine but when you hold it on full revs for about 10 seconds it starts to bog and then cuts out completely. Seems to do it more when hot.

 

I took it to the local dealer who swapped the Aspen for petrol and pronounced it fixed.

 

It did seem to run Ok for a bit but then started cutting out again after I refilled with Aspen.

 

So is it the Aspen or is it something else? I tweaked the L screw and it still cuts out at full revs so I am thinking blocked fuel vent?

 

But not sure where it is located on the Echo, does anyone know where to find it?

[Rich2484]

Hmmm was it retuned to run on aspen???

 

Not sure if it has a H crew but that's the screw for high revs. That needs adjusting for adjustment at max revs.

 

Gardenkit is the aspen man. He has it for breakfast lunch and dinner. I've also heard he likes a dabble in the evening when nones looking.

[Ty Unnos]

Yes it does have an H screw - but I am not so confident in adjusting it - I don't want to do any damage!

 

The other clue is the primer bulb seem slow to pop out again. I have read this is a sign of blocked fuel vent. Just don't know where to find the thing!

[Rich2484]

If you mean the fuel tank vent then it will be on the tank outside somewhere. Normally on the top.

 

I've found this but not sure how close it is to your one. Looks like its the check valve number 16.

 

http://dl.owneriq.net/7/772aaf6e-dc89-4805-a72d-b07ed6737fe9.pdf

 

 

Othe than that undo the fuel cap slightly and try running it like that.

[GardenKit]

Hi

 

Our three month old echo 280wes has started cutting out at full revs.

 

It has be running fine up to now.

 

We run it on Aspen and it has never had a problem.

 

Then on Monday it just started dying.

 

It starts and idles and revs fine but when you hold it on full revs for about 10 seconds it starts to bog and then cuts out completely. Seems to do it more when hot.

 

I took it to the local dealer who swapped the Aspen for petrol and pronounced it fixed.

 

It did seem to run Ok for a bit but then started cutting out again after I refilled with Aspen.

 

So is it the Aspen or is it something else? I tweaked the L screw and it still cuts out at full revs so I am thinking blocked fuel vent?

 

But not sure where it is located on the Echo, does anyone know where to find it?

Sorry you have problems Ty.

 

Firstly, it will not be due to Aspen. this fuel is merely a very pure, and chemically stable petroleum product, which is sold in sealed cans, premixed with high grade 2 stroke oil at a constant 50:1 ratio, always.

Petrol on the other hand, contains many impurities, is not stable, absorbs water, is seldom mixed to the same ratio of oil every time. it is therefore much more likely to cause problems than Aspen.

 

Any differences in tuning between the two fuels will be noticed at idle, and 'pick up' and will be tuned by the L screw. The H screw should not require any adjustment other than being set in the normal manner at PDI.

 

Your problem sounds like fuel starvation. Even though Aspen is pure, and will not form gums and solids to block filters, it is still possible to induce contamination whilst refuelling which may have restricted the pick up filter or the carb gauze. The tank breather, which is meant to let air into the tank could be blocked by external crud.

 

There could of course be other issues stemming from mechanical defect such as a coil breaking down under load or spark plug failure.

 

hope this helps.

[Ty Unnos]

http://www.barrettsmallengine.com/partslist/echocs270wes.pdf

 

Page 6 part 31? Looks like it is behind the starter - I will remove the starter and see if I can see it.

[Ty Unnos]

Sorry you have problems Ty.

 

Firstly, it will not be due to Aspen. this fuel is merely a very pure, and chemically stable petroleum product, which is sold in sealed cans, premixed with high grade 2 stroke oil at a constant 50:1 ratio, always.

Petrol on the other hand, contains many impurities, is not stable, absorbs water, is seldom mixed to the same ratio of oil every time. it is therefore much more likely to cause problems than Aspen.

 

Any differences in tuning between the two fuels will be noticed at idle, and 'pick up' and will be tuned by the L screw. The H screw should not require any adjustment other than being set in the normal manner at PDI.

 

Your problem sounds like fuel starvation. Even though Aspen is pure, and will not form gums and solids to block filters, it is still possible to induce contamination whilst refuelling which may have restricted the pick up filter or the carb gauze. The tank breather, which is meant to let air into the tank could be blocked by external crud.

 

There could of course be other issues stemming from mechanical defect such as a coil breaking down under load or spark plug failure.

 

hope this helps.

 

I run all my saws on Aspen and have had no problem so I am pretty sure this is not the issue. My first thought was a fuel starvation issue but I don't really have the technical know how to diagnose the problem. I will start by trying to get to the tank breather and see if it is blocked.

[spudulike]

I run all my saws on Aspen and have had no problem so I am pretty sure this is not the issue. My first thought was a fuel starvation issue but I don't really have the technical know how to diagnose the problem. I will start by trying to get to the tank breather and see if it is blocked.

 

Just loosen the fual cap when it is playing up, if the problem clears then tackle the tank vent, if it stays bad, don't bother:thumbup:

 

Typically a jippy tank vent will allow the saw to run fine for a minute or so but then the high revs will falter and may even die if the throttle is grabbed open at idle. It will then start up fine for a short while and do the same again.

[Ty Unnos]

Right - I dont think it is the tank vent. I had it out today and it seems fine - not blocked.

 

I also checked the spark plug - looks to be dry and a nice light brown - gap looks OK.

 

The fuel filter seems clean.

 

I noticed a couple of other things when running the saw today.

 

It seem to be OK when cold and only starts to play up after the saw gets good and hot.

 

Once its hot it starts and idles Ok but cuts out and dies after about 10 seconds at full revs.

 

A couple of times it seemed to race and the revs picked up just before it dies.

 

There seems to be fuel on the inside of the air filter. Is this normal?

 

Any ideas where I can investigate next?

 

Cheers