My 1982 yamaha xj 650 won't start, it has spark, and turns over.

SOURCE: valve clerance for yamaha xj 650,what is the clerance of exhuse and intake?

xj650(uk) and xj650j
inlet 0.16 - 0.20mm
exhaust 0.16 - 0.20

all other models
inlet 0.11 - 0.15mm
exhaust 0.16 - 0.20mm
set when cold

SOURCE: 1983 yamaha xj 650 no spark already changed the

• Do you see spark? If not, check the side stand kill switch. It kills the engine so that you don’t start out with the side stand down. If broken or out of adjustment, it would kill the spark. Check for a broken wire at the side stand switch and coupler. Try moving the side stand kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it.
• Is the handlebar kill switch on? Is it shorted out?
• Are you getting power to the coils?
• Check the fuses. How good is the battery? Try a jump start from your car battery.
• Check the operation of the ignition switch and all kill switches with a volt ohmmeter. Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center or side casing. If still no spark, get CDI system and coils checked at the dealers shop.

SOURCE: worshop manual for a 1981 Yamaha XJ 650

here you go buddy

http://www.pro-bike.ro/forums/index.php?autocom=downloads&showfile=681

SOURCE: 81 yamaha xj 650 spark plugs fire when engine

If you are saying the bike still continues to want to run, (rough running I am sure ), after the key is shut off then the engine is "dieseling". Carbon buildup on the piston / valves/ cylinder head is getting red hot from running. The hot spot(s) serve to ignite the fuel much the same as the spark plugs would. Burn only premium gas, be sure the cylinder is clean and not caked with mud or such, and change to a colder spark plug like NGK BP-8es or BP-9es ( BP-7es is the stock plug ). This may keep the engine cooler and stop the problem. The only other way is to pull the head then de-carbon it and the pistons. While the head is off, re-seat the valves using valve grinding compound. Check out Babbitts for parts. Go to www.babbittsonline.com/parts/viewbybrand/parts.aspx Please rate my answer.

Murtaza Akberali Versi

• 767 Answers
• Posted on Feb 28, 2010

SOURCE: 1982 yamaha xj 650, complete engine tune up

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