Clinician
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Post by beowulf101 on Oct 16, 2012 21:03:41 GMT -6
Thanks - so I tried it with the throttle full open, and still the same compression reading. I then removed the carb and got the same thing. Darned if I know what the issue could be. Is it back to the ring theory? Is there a way to check the new head gasket besides visual inspection?
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Clinician
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Post by beowulf101 on Oct 15, 2012 16:18:02 GMT -6
The continuing saga - I installed another new headgasket, and put the beast back together. I set the piston at TDC. installed the head, and put the cam shaft back in with the lobes facing down and the 2 small holes alligned with the edge of the head, . I then ran another compression check and got a reading of 30 - not good at all. Is it the rings or am i timing it wrong? This is so fustrating!
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Clinician
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Post by beowulf101 on Oct 12, 2012 10:26:04 GMT -6
Ok so to test the "ring" theory, I removed the head and manually turned the piston to the LOWEST point it would go. I then filled the cylinder with oil to cover the top of the piston to a point I marked...and then went to bed. I wanted to see if the oil would "leak past the piston. When I went out to check this morning - the oil level was the same. So was this a valid test? Or just another brilliant but useless idea that proved nothing?
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Clinician
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Post by beowulf101 on Oct 11, 2012 17:57:10 GMT -6
Sorry guys, just got back into town... I checked the compression on PDB (poor dead beast) and got a reading of zero! Then I checked my new compression tested using the air compressor and it worked fine..so I would say that I have a BIG compression issue!.
When it started acting bad last week, I drained the oil and it looked like chocolate milk - so that meant that coolant leaked into the oil somewhere (I am assuming head gasket) and I actually saw coolant sitting in the cylinder when I pulled the head. So, I replaced the head gasket, put it all back together, and refilled everything, and ......no joy.......so do I need new piston rings? Can they go bad in only 6500 miles?
Thanks...oh, and I've never pulled a piston before...this could be a good time to learn!
Any advice guys?
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Clinician
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Post by beowulf101 on Oct 8, 2012 12:20:57 GMT -6
Ok here is the story.. I have a YY250t with 6500 miles on it. I was riding last week when it started making a god awful racket. I limped back to the house (less than a mile) and started looking at it. It would start, but with loud bangs, so I shut it down. I saw coolant dripping on the floor, so I suspected the worse. I pulled the head and yup – coolant in the cylinder – blown head gasket!. Well I finally found a new head gasket and installed. I hand rotated the piston to the highest point (couldn't find a TDC mark in the inspection port on the variator cover), replaced the head and reinstalled the cam shaft with the big hole straight up and the 2 small holes level with the edge of the head (used toothpicks to ensure they r as close to even as is possible!). I have put everything back together, but it will not start! Checked the spark plug (works) but it does not even try to turn over! Any suggestions? I am at my wits end!
Thanks guys!
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Post by beowulf101 on Aug 31, 2011 15:38:47 GMT -6
Once again..u guys r great! thanks! Now where do I get the specialized screw that fits the metal drain ender? Any recommendations?
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Post by beowulf101 on Aug 31, 2011 15:11:25 GMT -6
Thanks ce ! That was the problem - sure glad u r there to help! OK, I give up...why does the carb need a dedicated wire wrapped fuel bowl drain tube the is blocked by a screw? Do they need draining that often?
Again, thanks for the swift and SIMPLY correct fix!
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Post by beowulf101 on Aug 31, 2011 13:46:53 GMT -6
Hey y'all...New to scooters - just bought a new YY250t in July and when it works, it is great!..Had some problems - wouldn't charge the battery, lights wouldn't work, but am now faced with a doozy! The scooter started being hard to start last week, and when I took it to the gas station to get gas, it finally started but poured gass from the carb all over the ground! I started riding it home and it just puttered and quit after 100 yards. Pushed it home. Now whenever I try to start, gas just runns out an overflow tube from the carb and it refuses to start! Any ideas on where to look for a solution?
Perplexed in Allen
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