AG200 toughness

Here in Australia, I’d like to think that, perhaps with the exception of Africa, we have the toughest environment on the planet for motorcycles. Particularly dirt bikes, and then add an extra dimension with farm bikes.

For AG bikes our conditions can be very dusty and hot, throw in farmers who don’t know the definition of the word “maintenance” and you can begin to understand that it can be a very tough test for a machine here in Australia.

A bike will be a pile of rubble in a year or so or it will keep running under diabolical conditions and state of tune. The ones that keep going tend to have a bit of a following and gain a reputation, and as you might of guessed by now, the AG200 comes under this category.

AG200 filters

Take the example shown here. This poor thing began its life ten years ago in Japan. An ’03 electric start version that ended its working days ten years later with the original owner. Check the filters…air, oil and strainer. I’m guessing that if this bike had ANY oil changes in it’s life time it could be counted on one hand!

AG200 oil filter

Its shows how robust the bike is though. How any air got through the filter is beyond me. The oil filter is so clogged that the poor old oil pump had to suck a hole through the gauze to get oil through! Amazing! And the strainer that sits behind the drain cap is deformed from lack of flow as well!

AG200 oil strainer

This treatment usually always ends in the same way; excessive wear enables the timing chain to fling off the gears and the whole show comes to a halt! Sometimes you will get lucky and the valves won’t smash into the piston (don’t ask me how this can happen!), but most of the time there will be valve damage.

AG200 timing chain

Another timing chain can be all that’s needed to get things on the road again but I doubt it will be its only problem after the torture it has endured. It shows the robustness of the engine design. It has few weak areas and they can easily be overcome by routine maintenance. Keep on top of the maintenance and you have an engine that will take you reliably wherever you want to go.



2 thoughts on “AG200 toughness

  1. Hi AGman great site! Our community farm has two 1980’s yellow tank AG200. I just acquired the second one for $400 which I thought was a bargain. Its not running very well yet and appears to suffer from the same problem as our first one. ie. Almost impossible to start after a week or two rest (especially if I forgot to run the carbie dry when storing it) and you can never get it to restart after a stall. If it stalls or dies while idling then you have to wait 20mins before you can start it again.

    Can you advise what might be the cause of this?

    1. Thanks for the comments.

      Community farm huh? Sounds interesting.

      Unfortunately, those bikes you have will be over 20 years old so there are going to be all sorts of possibilities into their poor running. Especially considering the people who owned them before you probably never gave them the servicing they required.

      I would start with a valve clearance and compression check, followed closely by a carb disassemble and clean. Check the rubber manifold between the carb and head.

      These early bikes also had a lot of CDI and electrical issues as well. When it dies, remove the spark plug and see if it has spark. That may isolate if its a fuel or ignition fault.

      Good luck and let us know how you go.

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