2t lawnmower tuning AS Motor

[Stubby]

6 minutes ago, Grassyass said:

We are not talking in general we are talking about this machine , These are a one off set up like no other I have ever seen  and after running  four of them for three years wish never to see again , 

just suggesting Red Line as you can run it at 100:1 and that is what the OP says it should run .

[Grassyass]

Sorry stubby I was not responding to you,I’ve never used Red line so I wouldn’t know .👍

[Stubby]

9 minutes ago, Grassyass said:

Sorry stubby I was not responding to you,I’ve never used Red line so I wouldn’t know .👍

Hey no worries . As it goes I think its the best oil out there , just my opinion and that 🙂

[Dan Maynard]

I've always found it confusing that an engine should run different on different oils but seems to be possible, comes up frequently when talking about the Echo 2511T (don't have one so not experienced it myself)

[Daniël Bos]

23 hours ago, AHPP said:

I would probably lavish a new spark plug upon it first and then investigate the governor. 

I did just that, which got it running.

Then once running it was behaving erratically. It would run perfect, then suddenly die, then stutter, then die again.

Hence me looking at the weird carb.

22 hours ago, pleasant said:

Since 2021 been owned by Ariens.

 

This manual not the right one then?

 

AS Motor 2 Stroke Engine (pdf | Manualzz

MANUALZZ.COM

 

That's the one!

That's very helpful thank you.

19 hours ago, Grassyass said:

I have this same engine on another as mower , it is the most erratic engine I’ve ever know , since brand new been a pain . They are two stroke but won’t run right on standard mix , it needs there own two stroke oil, if you run it on 100-1 seems to run better, I think it comes down  to the jets in the carb being very small , the carb always blocks , spent more time in the ultra sonic cleaner than on the mower, I had all the set up info from the manual sent from the dealer , if your struggling I could see if I can find it,

This isn't what I was hoping for...

[Daniël Bos]

The whole story, from the start:

 

Was brought to me from an auction, a mower business went under.

 

Visual inspection, nothing obviously missing, fuel smells normal, has compression.

Changed the fuel for fresh.

But no start.

 

Checked for spark, no spark.

Tried to check coil gap, found the shroud that the coil screws onto to be cracked.

Jb-weld repair coz quick and cheap, no point in a "proper job" if there's a major fault elsewhere.

Set gap to .25mm got good spark.

Tugged her into life and all sounded ok!

Went for a wee trial run, found throttle response to be extremely slow (but maybe that's just how it is?)

Idling rough, bit spluttery overall.

 

Then it died and I couldn't restart it.

 

Checked my JB bodge, which held strong and coil gap was still good.

 

So went to the carb. Cleaned it, found some corrosion smutz in the float bowl but no serious varnishing or blockages or such.

Put it back together, no go.

 

Posted for help on here as it didn't seem like the governor setup was how I'd expect it to be.

 

Tried to run it on carb cleaner, no go, injection of petrol down the intake also didn't get any results so back to the spark check.

 

No spark.

Measured 5.4 kilo-ohm across the coil, which I reckon is about right.

JB weld still good, coil gap just right, kill wire detached, no obvious breaksinspark wire, tacho clamped right against coil shows no sign of life.

Don't have any other coils that fit.

May try an ms880 coil just to see if I can get it to run long enough to find out if it works ok for what we need.

 

A new coil is €90, a carb €250!

 

 

[Grassyass]

It’s  a long lead from the coil to the plug if I recall plenty of points to get damaged ,if you get away with just a coil not to expensive a fix , if it had good pull when it was running  that’s a start, the gear boxes on the ones I had all went in the end , I was given the three wheel one to demo but didn’t get on with it found it to light on the front going up slopes ,and the front wheel seemed to dig in on  any ruts on the flat , they aren’t cheap so if you get it running you might be quids in, 

[Daniël Bos]

1 hour ago, Grassyass said:

It’s  a long lead from the coil to the plug if I recall plenty of points to get damaged ,if you get away with just a coil not to expensive a fix , if it had good pull when it was running  that’s a start, the gear boxes on the ones I had all went in the end , I was given the three wheel one to demo but didn’t get on with it found it to light on the front going up slopes ,and the front wheel seemed to dig in on  any ruts on the flat , they aren’t cheap so if you get it running you might be quids in, 

It's a long lead indeed.

But I've tried to find some spark at the beginning of it by clamping my tach there, no luck.

I do find it weird that it's resistance is about right.

Unless if maybe it has a break in the internal insulation causing an arc that's easier to make than the spark arc yet open circuit when I measure it?

[Daniël Bos]

More confused.

I swapped the coil with an ms880 one (coz biggest flywheel in my 2t collection)

No spark.

Tried a (4t) lawnmower coil.

No spark.

Tried the AS coil on said lawnmower.

No spark.

To rule out a break in earth continuity due to my JB weld, I put on a separate earth wire straight to the plug threads, no spark 

 

Flywheels can stop functioning, but then I'd expect a weak spark?

Also, it sparked really well for a bit when I got it going at first, followed by absolutely zero spark, which makes me think coil is bad, but then why do I get no spark from the other coils either?

 

Aaaaaaaaaaaaaaaaaaaargh!

 

I'm pretty sparsely thatched already, otherwise I'd be pulling out hair at this point 

[john87]

On 08/10/2022 at 13:01, Grassyass said:

I have this same engine on another as mower , it is the most erratic engine I’ve ever know , since brand new been a pain . They are two stroke but won’t run right on standard mix , it needs there own two stroke oil, if you run it on 100-1 seems to run better, I think it comes down  to the jets in the carb being very small , the carb always blocks , spent more time in the ultra sonic cleaner than on the mower, I had all the set up info from the manual sent from the dealer , if your struggling I could see if I can find it,

100: 1 will kill it, make no mistake about that..

 

I can tell you EXACTLY what is wrong with it, the fuel you are using.. Tip the shitty unleaded out and buy any one of the premixed alkylate fuels. Instant cure..

 

Unleaded will go off in a matter of weeks, and will wreck your carb too, hence you cleaning it all the time..

 

I have NEVER had to clean one of my carbs, but then i use the fuel direct from the makers tin...

 

john