No spark on my venox 250?

Question edited for clarity. I am sure hard acceleration causes 'exhilaration', but it was the wrong word.

Second gear put the most strain on the clutch for the longest time. First gear is a short shift with the highest torque, second gear is a longer shift but only with marginally less torque. Either the clutch is badly adjusted or the clutch plates and springs need changing.

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Service Manual

KYMCO VENOX 250 Service Manual - Clutch Removal

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KYMCO VENOX 250 Manual Online: Clutch Removal. Remove the four clutch lifter bolts. Remove the clutch lifter and four tension springs.

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  One Way Clutch Removal - KYMCO Venox 250 Service Manual ...

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  KYMCO Venox 250 Manual Online: right crankcase cover removal, One Way Clutch Removal. Drain The Engine Oil. Disconnect The Clutch Cable. Remove The Right ...

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https://www.manualslib.com/manual/890872/Kymco-Venox-250.html ------ this is service manual

Above the transmission, behind the rear cylinder.

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.

There is one sparkplug at center front of engine and one at center rear. They are fairly easy to change. Just follow your spark plug wires.

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

I think you're correct in guessing it's a head gasket.

I have the exact same issue. Did you solve problem?

Hi Small vacuum tube goes to the inlet manifold, safety device to prevent fuel flow when not in use.

If you literally **** on it it will start and run!!

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!

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!

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.

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.