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Hi i recently purchased a YTM 200E as a non runner, after hours of trying to get it running it started & ran for 30 seconds then blow alot of oil out of the breather. Blowby the rings i thought so i fitted an over sized piston,rebore & new rings, still the same hard to start then when it does it blows out most of the oil in the crankcase. I then took the head off & had two new valves fitted thinking it was that put it all back together with new gaskets and still the same. When cranking it over with the dipstick out there is alot of pressure comming out with each stroke of the piston. I have checked the valve timing it is ok & when you do get the engine running it ticks over ok and sounds ok. So has any one got any ideas to what else could cause massive crank pressure to build up.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1998 yamaha grizzly engine noise

you may have a collapsed lifter

Posted on Jun 21, 2009

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SOURCE: I,m getting fire and gas its in time hits but wont start

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

ollie reece
  • 1167 Answers

SOURCE: I had no compression with my 08' KTM 250 XC-F and

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. "

  • 1244 Answers

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"

wd4ity
  • 4565 Answers

SOURCE: oil blowing out throttle body on filter and

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.

Good Luck
Steve

Posted on Jun 21, 2010

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