Question about 2002 Ducati 748

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02 748 that was dropped on it's left hand side. bike will start but it feels like it's running on one cylinder. I checked spark, fuel and compression. Could it have jumped out of time? whot would you think the problem is?

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No, it could not jump time from being dropped. Check for vacuum leaks in the intake system. Something could have been moved, allowing air in where it isn't normally supposed to go. Also check your electrical system - battery connections still tight, no wires pulled taunt anywhere, none broken, no alternator or voltage rectifier cover slightly cracked or dented, shorting out.

Posted on Jan 11, 2009

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WHAT IS THE PROBLEM IF THE BIKE WILL START THEN SHUT OFF????


How long have got ? Has the bike been stored some time? If so fuel could be bad. Was it left in weather fuel still could be an issue. Is the fuel valve opened or trash in the screen? Have you checked plugs? Old way is to turn over engine an with hand over muffler does air feel warm coming out. If so you have spark. Or lay plug on ground an watch for quick spark. Fuel lines old, or cracked, may be sucking air. Is fuel reaching carb, so many things to check but you will have to step it through. Make sure you have spark, then go from there.

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i would actually replace the caps and leads on side not working, a bad connection may still spark when not under pressure, then test coil before i think about cdi

Feb 17, 2013 | Motorcycles

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Triumph America 2004. Shortly after purchasing second hand, the bike started to only fire on the left hand cylinder on starting. However after driving between 1km and 10kms the 2nd cylinder would fire up...


You might try looking at your transistor it could be the cause of your problems. Even though it is a carb bike it will still have an transistor pack or similar that controls your spark. It is possible that failed. Try one from a bike that you know is working if that makes a difference that is your problem.
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Your cycle runs when you pull off one spark plug wire per cylinder. There are two spark plugs per cylinder and you did not remove both . Therefore you still have one spark plug on each cylinder firing to run the machine. Your motorcycle is also equipped with a side stand safety switch. Your bike will run on the side stand . But, if you put the bike in gear with the side stand down it is designed to turn off the motor. This is so you do not drive away with the stand down and loose control of the motorcycle on your first left hand turn. Get in the habit of putting your side stand up before putting the bike in gear and your problem is solved. Read your owners manual.

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1 Answer

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Assuming you properly cleaned the carburetor low speed circuit.check the list below.
1.Check the compression on the right hand cylinder.
2.check your points,pull the point cover off start the bike and watch the points if you see bright sparks at the contact point the condenser is is bad.
3.If your constantly getting an oil fouled plug the right hand crankshaft seal is leaking transmission oil into the crankcase.
4.check your fuel flow from that line to that carb.
Hope this helps you determine whats going.


Jun 04, 2010 | Yamaha RD 250 Motorcycles

1 Answer

My bike won't start


First make certain the fuel is fresh ,and drain any old fuel out of the carb ,small screw at the bottom of the float bowl.when dry turn fuel on ,if flow starts again no blockage .start bike now,if no fix, remove spark plug if it is dry the carb is blocked . touch plug to cylinder head and start be carefull not to shock yourself use pliers . If no bright blue spark check side stand cut out switch ,kill switch . if the battery has been left uncharged for more than 2-3 months replace as wont work well. to check for seizure remove plug and push bike in first gear you should hear and feel the engine turn.

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1 Answer

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It seems the charging system of your bike is not working
Recharge the battery and thn fit it in the bike and start it and check the charging rate.
Remember with lights 'on' it drains power from the battery butthe charging system of theengine takes over i.e. if its working alright, with your explanation, its for sure the charging system is not functioning.
Chekc the altenator and the rectifier.

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1 Answer

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Hello,

Remove both sparkplugs from engine. Plug them back in the sparkplug cables and let them rest on the engine.
Make sure your battery is well charged.
Check for sparks while kick-starting...
Interchange the sparkplugs in the cables:
-Same plug give sparks: replace the spark plugs.
-Same side of engine sparks: interchange the low-voltage connector at the ignition coils.
Give it a try:
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Other side of the engine sparks: Check the circuit harness for loose connectors, and/or Clean-replace the breaker points ( left side of the engine carter ).

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1 Answer

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Hi and welcome to FixYa,

A way to verify start the bike from the cold. Note which exhaust will not heat up after the start (carefully). If the exhaust not heating would be from either cylinders 1 & 4 or 2 & 3, then it would be an electrical/ignition problem. If on the other hand what will not heat up will be the exhaust of 1 & 2 or 3 & 4, then it would be a carb/fuel problem.

Alternately, removed all the sparkplugs, reconnect to the cap and lay on metal part, start the bike. Note for absence or presence of spark on plug ends.

Good luck and thank you for asking FixYa.

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