QuestionQUESTION: how can I set The Timing in my 200S ATC HONDA 1985.
ANSWER: Manuel, the ignition timing is not adjustable.
http://www.bikebandit.com/houseofmotorcycles/honda-atv-atc200x-1985/o/m1899
If you look at the pulse alternator, you will see that there is a mechanical spark advancer which needs to be working properly. Take off what used to be a points cover on the cylinder head to check the spark advancer function. It is spring loaded, so should advance and then retard when you twist the unit on the end of the camshaft with your fingers. If it has rusted up, it could be causing inaccurate timing either at idle or at full advance, depending on the position of the advancer when it siezed up.
The trigger on the advancer lines up with the pulse generator when the F mark is aligned on the flywheel/stator for correct ignition timing. I am assuming you aren't asking about cam timing.
Hard/non starting problems are generally a function of a plugged up carburetor idle jet circuit. You cannot let bikes sit for weeks at a time with gasoline in the carbs. It will separate and the alcohol will go to the bottom of the bowl and plug up the idle jet as well as be the main source for fuel to all the metering circuits when you try to start the engine. The carbs are not setup to run on alcohol, so you have problems when that is mostly what is available to the jets in the float bowl. Try draining the fuel system and put in fresh gas with stabilizer. If it will start on starting fluid, but not on its own, then the carb jets are plugged up, in most cases.
Bill Silver
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QUESTION: hi, the problem is ,I PUT NEW PISTON NEW RINGS NEW CARBURATOR NEW WIRE HARNESS,AND ALL I HEAR IS LIKE EXPLOSIONS,AND I THINK PROBABLY IS THE TIMING ,PLEASE HELP ME,THANKS.
AnswerManuel, NOW you tell me the rest of the story! Yes, it probably is cam timing issues.....
The cam goes in so that when the piston is at the T mark on the flywheel, the lobes of the camshaft are both DOWN in an inverted V shape. There is a mark on the sprocket, either a punch mark that goes to 12 o'clock position or sometimes there are lines that are marked on the sprocket, which go parallel with the cylinder head surface. Those need to be located correctly when the piston is at the top of the cylinder (T mark).
If you put the cam in a couple of teeth off, then there is a possibility that you have bent one or both valves. Either reset the camshaft timing and then check the compression with a gauge to see if you have about 150 psi or more, OR take the head back off again, so you can see if there is damage to the valves/piston.
Bill Silver
