2t lawnmower tuning AS Motor

[Daniël Bos]

Hi, I've been away from the delights of being annoyed at unknown other people's opinions and ignoring best advice to do whatever was planned before asking for advice....

Anyway, hi again...!

 

I've aquired an "AS motor" rough terrain mower. It's a three-wheeler with a 165cc two stroke engine.

 

It's running a bit rough though, any tips on how to tune it.

It's got a carb unlike any other two stroke I've seen.

It has a weird throttle setup where the valve is controlled by a flagpole thing that's moved by the breeze off the flywheel, bit like a governor.

 

I'm somewhat confused and not sure where to start.

I've asked my mower guy who doesn't know coz it's two stroke, and my two-stroke guy doesn't know coz it's a mower, and weird.

 

Any clues?

[pleasant]

Why not get on contact with AS motor?  It's their machine and will have a technical dept...and they will have known service agents who they can give you details of.

[spudulike]

Sounds like a governor, if the engine revs get too high, the flywheel causes the flap to move which in turn shuts off the carb like a choke would and lowers the revs. Lawnmowers seem to do this a lot.

I know bugger all about your mower but if it is like most, make sure the float bowl is clear of debris and water and make sure the main jet is clear of dirt.

[Daniël Bos]

9 hours ago, pleasant said:

Why not get on contact with AS motor?  It's their machine and will have a technical dept...and they will have known service agents who they can give you details of.

It's not a new machine and the company is Bavarian I believe (that's relevant coz german²) they'll never send a workshop manual to a mere end user without the correct paperwork!

You Must Haff Ze Korrekt Papers!!!!

 

And as far as finding a dealer, I can do that but I'm not. I'm diving in there myself!

Edited October 8, 2022 by Daniël Bos

[Daniël Bos]

9 hours ago, spudulike said:

Sounds like a governor, if the engine revs get too high, the flywheel causes the flap to move which in turn shuts off the carb like a choke would and lowers the revs. Lawnmowers seem to do this a lot.

I know bugger all about your mower but if it is like most, make sure the float bowl is clear of debris and water and make sure the main jet is clear of dirt.

Yeah, I've done the usual clean etc.

I've not encountered such a beast before, and there is very little info on the interwebs but I suspect it may be missing a return spring on the governor setup.

 

[john87]

What does it do wrong then??

john..

[AHPP]

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

[pleasant]

2 hours ago, Daniël Bos said:

It's not a new machine and the company is Bavarian I believe (that's relevant coz german²) they'll never send a workshop manual to a mere end user without the correct paperwork!

You Must Haff Ze Korrekt Papers!!!!

 

And as far as finding a dealer, I can do that but I'm not. I'm diving in there myself!

Since 2021 been owned by Ariens.

 

This manual not the right one then?

 

AS Motor 2 Stroke Engine (pdf | Manualzz

MANUALZZ.COM

 

[Grassyass]

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,

[pleasant]

Mix shouldn't make any difference. It's the manufacturer of the oil that dictates the dilution ratio of their oil to give the best performance- not the engine. You can mix Stihl stuff at recommended 50:1 ratio and will go in any non marine 2-stroke. The engine won't know.