Question about 1982 Yamaha XJ 650

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Fuel coming through the crankcase of a 650 yamaha engine

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Carbueretor floats stuck open allowing the fuel to pass thru freely and into the intake system in which it the goes to the crankcase as it passes down thru the piston rings. Remove, clean, and rebuild the carbs.

Posted on Jul 18, 2009

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You forgot - CHANGE THE OIL!!! DO NOT START THE BIKE WITH FUEL IN THE CRANKCASE - think GRENADE.

Posted on May 24, 2013

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1 Answer

Gas is pouring into crankcase what is causing this


Hi, Anonymous and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
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.
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http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Jul 03, 2014 | 1983 Yamaha XJ 650

1 Answer

Why is my 2009 Yamaha 650 Vstar sputtering when accelerating at mid to high speed?


Hi, Anonymous 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 check for spark leakage in the dark
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. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system, carburetor and/or filter.
12. Old dead or bad fuel.
13. Fuel tank vent system plugged or carburetor vent line closed off.
14. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
15. Carburetor controls misadjusted.
16. Damaged carburetor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes
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.
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http://www.starbikeforums.com/forums/18-engine-work/5238-engine-bogs-past-1-4-throttle.html
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Sep 10, 2013 | Yamaha XVS 650 Dragstar Classic...

1 Answer

Dragstar 650 runs rough at high rpm


Hi, Anonymous 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 check for spark leakage in the dark
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. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system, carburetor and/or filter.
12. Old dead or bad fuel.
13. Fuel tank vent system plugged or carburetor vent line closed off.
14. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
15. Carburetor controls misadjusted.
16. Damaged carburetor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes
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.
http://www.motorcycleforum.com/129-first-bike-new-rider/101152-losing-power-v-star-650-a.html
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Yamaha XVS650 Service Manual
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YAMAHA XVS650 Owner Manual

Mar 06, 2013 | Yamaha XVS 650 Dragstar Motorcycles

1 Answer

Need crankcase exploded view


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf
Yamaha XJ 650 4K0 80 84
Tips Tricks

Jan 27, 2013 | 1981 Yamaha XJ 650

1 Answer

99 yamaha vstar 650 clasic no power when acelerating i cleaned carb


Hi, Anonymous 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.
Re HELP Star 650 dies at half throttle Road Star Forum Yamaha Road Star
Losing power on Vstar 650
98 00 Yamaha XV650 Star Service Manual XVS650 Moto Data Project
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2003/LIT-11626-16-05_22.pdf

Jul 15, 2012 | 1999 Yamaha V Star Classic

1 Answer

I have a 1982 yamaha 650 turbo should i connect


You must mount the tank and hook up the fuel feed lines. But you do not need too bolt the tank down just to start the engine.

Apr 26, 2011 | 1982 Yamaha XJ 650

1 Answer

I have my nephews 83 Maxim in my garage, when I start the bike oil flows from what I believe is the drive shaft vent tube into the air box. What would cause the pressure in the driveshaft to increase to...


I think what you are looking at is the crankcase vent line.....the blowby gases from the engine flow into the airbox to be burnt with the incoming air.
Have a close look at the oil level in the crankcase....Yamaha usually has an oil window ....down low on the side of the crankcase....with the bike warmed up and shut down a few minutes on the centerstand...the oil level should be about half way in the glass.....overfilling the crankcase will cause the oil carryover situation you describe.

Apr 17, 2011 | 1983 Yamaha XJ 650

1 Answer

Were is oil fill on 1980 virgo


Not sure on the older Virago....but on the newer ones....its located as follows..
On the riders left side of engine...near the front...find the fill cap for adding oil....now look directly below and you will find a round window on the side of the crankcase down low. Usually Yamaha has two marks on the crankcase beside the window for Min and Max oil level.
Usually half way between works best.

Mar 13, 2011 | 1980 Yamaha XJ 650

1 Answer

1974 TX500, high idle, white smoke from breather tube


The idle problem is a lean fuel mix caused by an air leak in the intake system. Bad gaskets /seals on the intake manifold, bad valves, bad piston rings, loose spark plugs, and bad head gasket are all things that can lean the fuel/air mix. The smoke indicates a need for new rings. I would have the cylinders bored then install new pistons and rings. Now finish the top end work by getting a valve job. You should get a liquid fuel tank liner to eliminate any rust problems in the future. Also, install an in-line fuel filter. Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html


My complements on the well cleaned carbs. Do the work mentioned above an you will effectively have a new engine.

A “very helpful” rating for this answer? Thanks!


Jun 11, 2009 | 1973 Yamaha TX 650

1 Answer

Oil blowing out of trans breather tube


hi 81 yamaha i am concerned about the fuel smell coming out with the oil. could be the carbs flooding filling your crankcase with fuel? if not it sounds like you have blow by which would cause your crank case to be slightly pressured. this is caused by worn piston rings. do not plug your crank vent. if you leave your vent open install small filter to stop dirt from entering jim

Mar 21, 2009 | 1981 Yamaha XJ 650

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