Question about ATVs
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Posted on Jan 02, 2017
I had a simular problem with my 88 xr. It started out just running bad at higher speeds which had me thinking it was a carb or plug problem. I started changing plugs and had varing results which still had me guessing. So I started adjusting and jetting the carb. Still the same varing results. I suspected the CDI box so I tried to get one. (I live in Thailand, not the easiest thing.) The parts places produced several boxes that plugger in but gave me the results you just described. Good spark but no start, I also got one box that started the bike real good but would not accelerate. There is a built in timing in those CDI boxes. Just thought you might check this, By the way the original box of mine eventually failed completely and I was correct in my suspicions. I found a used one and it runs great.
Posted on Jul 09, 2009
it should line up at tdc when the piston is on the compressing stroke at the top off the barel so basically when its just about to spark get back to me if not ok
Posted on Sep 25, 2009
Testimonial: "Yeah your right, I took the magneto cover off so I could turn the crank slowly and found I was a tooth out. Thanks for your help. "
SOURCE: My yamaha fzr 250 won't start
back the valve adjustment off!! there set too tight
Posted on Jan 16, 2010
Testimonial: "Shims were out of spec from previous owner thanks mate i never would of checked them if you didnt mention the valve clearance"
The oil may not be coming out of the throttle body. The crankcase breather system is actually in the rocker box covers. Yes, there is a breather gear in the crankcase but that is for the oil return to the oil pump.
The crankcase ventilation system vents crankcase pressure into the air cleaner as required by the EPA. The purpose is to route oil mist contained in the crankcase ari that is vented into the engine to be burned. There are 'umbrella valves" in the center section of the rocker boxes. Over time, the heat makes these pieces get hard and brittle since they are made of a type of rubber. When this happens, they don't stop the oil mist as well as they used to. The oil mist is blown into the air filter where it coaleses into drops of oil. This is normal for any Harley due to their engine design.
But, if it's too bad, I'd suggest replacing the umbrella valves. Simply remove the top and center section of the rocker boxes by removing the six bolts that hold the parts on the top of each cylinder. Replace the umbrella and the edge gaskets and replace the covers. Torque the bolts to 10-13 foot pounds.
Posted on Jun 21, 2010
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