so as its titled need some advice i fitted a 150 cc to my apache and now it wont fire up i just cant see why the piston is the right way around rings in the right place just cant get it to fire up just keeps ticking over
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so as its titled need some advice i fitted a 150 cc to my apache and now it wont fire up i just cant see why the piston is the right way around rings in the right place just cant get it to fire up just keeps ticking over
check cables, ignition, fuel, air, spark... check compression... and heaven forbid the kill switch isn't... is it? Hmmm not easy to diagnose via the www... bit like prospective patients looking for a medical opinion or diagnosis over the net... meh... doesn't really work out.
how would one check if there is spark coming from the spark plug and if fuel is reaching the engineQuote:
Originally Posted by bikerdoc
also been advised to change the jets
and if its compressed properly
you can check the spark by hold the plug against the engine (with the lead on) and hitting the starter you will see the spark if it is happening. A good healthy spark is blue. Check the fuel by undoing the drain at the bottom of the carb bowl, once you know its got that far it should get the rest of the way to the engine unless the jets are blocked. Are you sure the cam is timed correctly? Does it have compression?
been advised about the timing and how it needs to be lined up and how di i check the compression
stick your finger over the plug hole and hit the starter , if it pushes your finger away it has compression, you could use a compression gauge , usually you can hire them
thanks very much will check in fewQuote:
Originally Posted by zhu
no worries. Its also a good idea to use new gas especially if the bike sat for any length of time .The gas gets stale and loses its desire to burn
Spark, as advised take the spark plug still connected to the HT lead and loooking at the electrode end you should see the spark jump across the electrode when you press the starter button with ignition switch on, which confirms functionality of the spark plug, that the plug gap is adequate and that there is naturally electricity flowing down the HT lead, this is with the lead on. You can check the HT lead against any ferous metal object to check that there is a spark, by exposing the metal cap within the HT lead that fits over the spark plug and placing the exposed contact a cm or so away from the ferrous metal obkect e.g. engine.
For fuel, check that there is fuel in the tank, that it's flowing down the fuel line and into the carby or injection unit if it's an EFI unit. If you are cranking the engine and inducing a flooded condition by using the throttle when the engine is cold, then you should experience a strong petrol odour wafting about. This in itself would be suggestive that there's fuel. As for timing, you got that right, there will be a marking in terms of TDC etc. Checking compression is better done with a gauge but a finger placed against the spark plug hole would work. Another thing is how were the valves and valve guides with the you had the head off? How's the air filter, clean, dry or soaked in petrol, If you have a wet air filter element and strong petrol odour, then go with WOT - that often works. If the petrol might be stale, or has water in it, get some petrol treatment like sea foam... and have you checked that kill switch. It might have been knocked into the close position.
A possibly problem might be the cam being timed incorrectly, it's not uncommon to get it 180 degrees out! Check.
Is the head tightened down correctly, any leak here and it's not going to start, as others have said, check the kill switch!
Check you are getting fuel to the carb(drain bolt - open it slightly and you should see fuel drip out), obviously a spark plug check but do it before you drain any fuel anywhere!
Changing jets is the thing to do once it's running, it will start on the original jets but run badly, if all is ok with connections/ fuel/ air then my money is on the wrong timing of the cam, go through the whole process of installation slowly and methodically, follow each step and take your time.