Switching to Aspen!!!!

[GardenKit]

Don't get too carried away with this retuning thing, in the majority of cases machines will run fine just as they are.

So try them first, then only retune if needed.

No different to changing from different makes of petrol really.

 

Edit, sorry Spud, did not see your post before i posted, you have it well covered.

Edited December 13, 2015 by GardenKit

[dirtybiker]

Thanks for all the info all.

That's great👍

[GardenKit]

The technical explanation for why the L screw may need tweaking a little richer.

 

At idle the flow through the carburetor is low. Some of the fuel is evaporated and some remains liquid at the bottom of the intake pipe.

 

Suddenly opening the throttle will give an immediate air flow increase to the cylinder. The evaporated fuel follows the air flow, but the liquid fuel takes longer to increase its speed. This means that the first second after opening the throttle, the engine will get a lot of air but very little fuel and the response is bad.

 

This is normally compensated for by an acceleration pump in the carburetor. With alkylate fuel only 15 % is evaporated at 70°C compared to 30 % for normal fuel. This can be compensated for, by opening the “L” screw 1⁄4 turn.

[dirtybiker]

The technical explanation for why the L screw may need tweaking a little richer.

 

At idle the flow through the carburetor is low. Some of the fuel is evaporated and some remains liquid at the bottom of the intake pipe.

 

Suddenly opening the throttle will give an immediate air flow increase to the cylinder. The evaporated fuel follows the air flow, but the liquid fuel takes longer to increase its speed. This means that the first second after opening the throttle, the engine will get a lot of air but very little fuel and the response is bad.

 

This is normally compensated for by an acceleration pump in the carburetor. With alkylate fuel only 15 % is evaporated at 70°C compared to 30 % for normal fuel. This can be compensated for, by opening the “L” screw 1⁄4 turn.

Wow thanks, I've learnt some thing there!

Every day is a school day. 😀

[agg221]

Cheers Alec.

Think that's a done deal then, will probably have to run the rebuilt Echo up to spud for a set up after the rebuild.

Where do you source your Aspen Alec? Think the nearest place to me (Felsted)is

Ernest Doe in Braintree!

Jez

 

I'm near Haverhill but work near the southern edge of Cambridge so Duxford Hire & Supply is very convenient.

 

Alec

[Eddie@aspen]

Hi all,

 

Any problems running on Aspen let me know.

 

[email protected]

 

07568 108953

 

we are here to help

 

Happy Christmas from all the team

[oldwoodcutter]

Ive been coughing all kinds of gunk up for months, but now since running all my stuff on Aspen for this past 2 or 3 weeks, my cough has gone.

I dont know if its down to Aspen,but if it is, i'd like to say thanks to you Eddie. - Tim.

[GardenKit]

I hear this from many Aspen converts Tim, I'd say its most defineately down to the absence of pump petrol.

[felixthelogchopper]

I hear this from many Aspen converts Tim, I'd say its most defineately down to the absence of pump petrol.

 

It's the main reason that I have switched over to using Aspen, more so than my machines' health and longevity. I still think it's very expensive but what price health?

[SteveA]

Same here.... no headaches or acid flem throat with Aspen. Cheers, steve