Re: I have a 1992 yz125 im getting good spark and fuel...
Your spark should be a fat blue spark. Do a compression check, as it should get at least 100 psi or more, and do it with the throttle wide open. Make sure the air filter is clean!
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i suggest u change the following:
ht leads
Spark plugs
ignition coil
when u r done with that and problem persists, then check ur fuel supply.
Good luck.
Not sure I am following your story, but you need compression, spark at the right time, and fuel for the engine to start. If you know for a fact the plugs are firing, and you have compression, you may not have fuel at the injectors.
If it was an AUDU/VW I would be sure it is your crankshaft position sensor not working. In this instance there is no problem checking that too. Check if you have a spark at the plugs. If ypou don.t have then your fuel pump wont come on.
Fuel? Does fuel pump turn on? If you have TBI, is there fuel spray when cranking? If you have port fuel injection do you have fuel pressure at the rail? In both cases, is fuel pressure regulator functional?
If you have fuel, and spark- do you have the right firing order?
I had a car a couple of years back do this to me, it was the crankshaft sensor. It will not fire at all if it is bad. Luckily the part is really cheap.
Check your timing. Sounds like you know what you are doing and if you have spark, fuel, and comptression it should run unless it jumped time. It could be off a tooth or two and still have compression. With high milage that would be something to consider.
Try changing your filter first if that does not work it could be your pump. It is possible for the pump to still pump fuel up through your filter but if it is not putting out sufficient pressure then your car wont start. Most fuel injection systems require around 35psi to fire the injectors.
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