Question about 2003 Kymco Venox 250

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No spark on my venox 250?

I removed spark plug and pressed on engine case and hit start button but no spark? i tested both cylinders and no spark in either? any suggestions? many thanks

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  • graham davies Nov 30, 2011

    no power to coil. where do i go from here?

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  • Kymco Master
  • 17,130 Answers

Possible failure of the ignition unit. you need to trace the voltage to the coil, the trigger voltage if absent then the ignition system is defective. Check the input and also the 12 volt to the coil , if coil is heating it can be faulty.

Posted on Nov 30, 2011

  • graham davies Nov 30, 2011

    there is no voltage to coil with ignition on, even when pressing starter button

  • graham davies Nov 30, 2011

    right there is 12v volt to coil when ignition is on but no pulse voltage from other wire when pressing starter button. ignition unit faulty?

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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Do a compression test. Check for spark at the plugs BUT best to have new plugs.

on any four stroke engine, you must have three things for the engine to run. You need fuel, spark, and compression. The easy one to check is the fuel. Take your air filter off and make sure you're getting fuel to the engine. Then, check your spark. Pull the spark plug wires off the spark plugs in the head and insert another set of plugs in the wires. Ground the plugs against the engine, turn the ignition switch on and press the start button. Watch the plugs to see if you have spark. The next test is compression. With the engine cold, remove the spark plugs. If you have a compression gauge, connect it to one of the heads and spin the engine over with the starter. If you don't have a gauge, simply put your finger over the spark plug hole. Turn the throttle wide open and press the start button. You should show about a hundred pounds of compression if you have agaugeor the compression should blow your finger off the hole with a good deal of force if you're checking it that way. If you have all three of these and they're timed correctly, the engine should run. If the engine won't run, find out which of the three elements is missing and work from there.

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Did the vehicle set up for a long period and did you use a fuel stabilizer in the fuel.

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Hi, Anonymous you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carb banks should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
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https://www.zxforums.com/forums/zx-7r-forum/7065-not-all-cylinders-firing.html
https://www.visordown.com/forum/workshop/one-cylinder-not-firing
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1 Answer

Still performance problems. ISOLATED cylinder(s)


Since you are getting sparks to all the plugs thn the problem could be tht of fuel to those two cylinders 2 & 3.
What was the condition of the spark plugs in those two cylinders? ( 2 & 3 ), were they wet or dry?
Try te following,
Swap the spark plugs form the firing cylinders and fit them to the cylinder 2 & 3.
Try to block up the air intake side of those two cylinder carburator and start the bike's engine see if they would fire, if they do fire thn theres a problem to those two carburators, fuel is not going into the combustion chamber, the problem could be float level , or the jets may need to be blown with compressed air.
Hope this helps!

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1 Answer

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Loose the gas additive. Clean the air filter and then install new spark plugs. If the bike has carbs, drain the carbs. .... All fixed!

Could you take a moment and rate my answer? Thanks!

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2 Answers

Loss compression


How to Test Engine CompressionAn engine depends on an equal compression reading in each cylinder to run smoothly. If poor compression exits in one or more cylinders it can cause a rough idle condition and low power. A compression test can be performed to check wear or internal damage. To start a engine compression test gauge is needed. There are two types of gauge styles, one threads into the spark plug hole which is more accurate. The other style of gauge is constructed with a rubber plug that is meant to be pressed against the spark plug hole, this style of gauge is difficult to use. To perform a engine cylinder compression test follow the steps below.
  • Remove ignition coil connector or ignition system fuse to disable power to the ignition system
  • Test ignition system to ensure that the power to the system has been disabled
  • Remove #1 cylinder spark plug and insert compression gauge, most gauges have a hose attachment that is installed into the spark plug hole with the gauge connecting to the gauge hose.
compression_gauge.jpg
Engine Cylinder Compression Gauge
  • After the compression gauge has been inserted, use the starter to crank the engine over for about five seconds. Use about the same five seconds to test the remaining cylinders.
  • Record the compression reading as each cylinder is tested
  • Remove the compression gauge and reinsert the spark plug
  • Follow this procedure until all cylinders have been tested
  • Compare cylinders compression reading, all readings should be within about 5% of each other
If low compression exists a cylinder malfunction exits and further inspection is required. Possible causes for a low compression condition are: burned intake or exhaust valve, broken piston or piston ring, broken valve spring or a blown head gasket.

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