Does this meaning the a-spoonful-of-oil trick doesn't work?
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Shocked and stunned...the oil test should have confirmed worn bore and if it made no difference it would point to the valves. Still, all's well that ends well, glad you got it sorted.
I promise I didn't invent that procedure. It's in my gauge's users manual. I would have thought that after that mileage the rings would be a bit worn as well as the valves. |
Just good that the problem is solved. Good for another 25K.
Allen |
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Spud :) |
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But i think this engine faliure is my foult, becouse the last time iv checked valve clearrance was on about 8 000 km, becouse when i opened camhead there was no clearance between valves, so the valves didnt get back all way,and there was little micro-space between valves and head and the valves got burned slowly but noticable. |
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I should have 10,000 miles shortly. I rode today.
I was only planning for this bike to last 15,000 miles, but it runs great. Allen |
i have been fooled by the oil test myself here is my theory of why the valves the one i had was leaking and out of adjustment the oil will seal up valves just like it will for ring the test is still good just check the valves closely at the first sign of poor compression
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I adjusted my valve clearance two days ago. ;) This was the second valve adjustment I have done on my Zong, and the procedure went very fast; I was easily done in 30 minutes. :) After you do the procedure once, it becomes much easier the second time. ;) I am very pleased to hear that your piston rings and bore are still in good shape after 15,500 miles. :) The 167FML engine in the Sierra 200GY-2 is a bulletproof little powerplant! :D Based on your experience, and mine, I strongly encourage all motorcycle owners to read Red's superb Valve Adjustment Tutorial. http://chinariders.net/modules.php?n...ewtopic&t=1655 If riders own a Zongshen 200GY-2, they also might enjoy seeing the photos I took during my first valve adjustment. http://chinariders.net/modules.php?n...ewtopic&t=6458 Spud :) |
I have purchase several parts bikes with broken valves from lack of adjustments.
Allen |
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Forchetto offered his usual, superb advice, which quickly diagnosed the compression problem. While checking the rings and bore, Max was easily able to discover the damaged valves. :) You also offer excellent advice, Phil. If a bike owner has bad engine compression, he should always check the valves also, even if the piston rings are bad. ;) Quote:
Spud :) |
I would like to add an update to my previous post in this thread. I recently tested the engine compression on my Zongshen Sierra 200GY-2 motorcycle. After making a valve adjustment, I measured engine compression with the throttle held wide open; I obtained a reading of 148 psi. This reading is much higher, and more reasonable, than the compression reading of 105 psi I reported in my previous post. :D
Spud :) |
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