Question about Yamaha Xv 250 Virago S Motorcycles
Ok so the rear piston wont fire but will kick in when ridding (sometime takes up to ten minuets) usually kicks out when stopped at the lights i have checked the plugs and i am getting spark the plug in the rear piston comes out black and wet i checked the compression and it is lower in the rear piston i managed to fire the rear piston on its own and it would run but not idle the bike sat still for two weeks then was ridden for about an hour then sat still for three weeks bike was ridden everyday after that and i noticed the problem getting worse and worse (piston take longer and longer to kick in ) any help would be much appreciated as i dont really have hundreds of $$ to fork out to a mechanic
Hi, Brandon and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Probable Solution to the Firing on One Cylinder Issue 50MPH at WOT No More
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Posted on Jul 04, 2016
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Posted on Jan 02, 2017
SOURCE: rich mixture virago xv250
look up your bike here and i think it is number 13 on the diagram. which looks like its right by where the throttle cable connects
Posted on Mar 24, 2009
Sounds like a slightly bent shift fork. The slider gear isn't quite engaging into 2nd. If the bend gets worse then you won't get into first and the pedal will get real stiff in those gears. The repair is best done in the shop.
Please rate this solution. Thanks!
Posted on Mar 28, 2009
Does it feel like yhe kick is even engaging and turning the crankshaft? Are you full stroking/kicking it over or short stroking it? when cold, are you using the choke. I suggest taking a compression test when it feels as if it hs no compression It could be undersized piston, rings, or a simple. good luck
Posted on Jun 12, 2009
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