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Post by cptk on Oct 1, 2011 22:32:19 GMT -6
What would be a suitable reading for a 257Linhai after a few/ Several thousand miles....? It is consuming oil in some manor , just not sure??? No smoke involved...just a couple of small leaks... But with only a small amount in the engine to begin with it could be leaking out???Drops here and there, but who knows how much on the road. Bottom line: What would be a suitable reading for this size engine??
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Junior
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JCL MP-250A
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Post by Ernie on Oct 2, 2011 6:06:18 GMT -6
I don't know about compression but mine was leaking oil from the oil seal inside the water pump. Seal replaced, no more leak.
Squirt down the motor with simple green or a similar degreaser cleaner. Wipe it clean and observe where the oil seeps from after running it for a few days.
Torque down all major bolts, particularly near any visible leaks.
Ernie
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2008 Roketa MC54B-257 (10,000 Miles) and counting
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Post by bhinch on Oct 2, 2011 6:38:07 GMT -6
Hi...guys and gals....my scoot has always used oil....no leak.... for it's entire 6000 mile trip....it has to do with the quality of the rings/cylinder composition....I just check it often and add as needed....it's just a machine....no more...no less.....it is not a perfect world....enjoy the ride...
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Junior
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2008 Roketa MC54B-257 (10,000 Miles) and counting
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Post by bhinch on Oct 2, 2011 6:48:28 GMT -6
We did not answer your question....it will vary from engine to engine....no pat answer...the real answer is to use a differential compression tester....used in aircraft inspections....you pump 80 lbs into the cylinder at TDC and see what the second gauge reads....anything below 70 lbs is time to pull the cylinder and replace the rings...hone the cylinder or replace it all...and do a valve job on it....I am a licensed Aviation Maintenance Tech (A&P)....and Commercial Pilot.....this really tells you what condition the engine is really in....just some info...
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Post by JR on Oct 2, 2011 9:35:28 GMT -6
The compression on this engine to be called good needs to be in the 165 to 195 psi range. If it is lower then put some oil in the cylinder and test again, if it comes up considerably then the rings are weak.
JR
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Post by damin69 on Oct 2, 2011 11:42:02 GMT -6
The compression on this engine to be called good needs to be in the 165 to 195 psi range. If it is lower then put some oil in the cylinder and test again, if it comes up considerably then the rings are weak. JR Ok I guess mine may have a problem then. it is only 150 psi. |
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Post by JR on Oct 2, 2011 12:00:31 GMT -6
If you look in the YP250 Service manual you'll see it's rated at 1400kPa = 203 psi so I actually put it a little low but I was allowing for some miles. Again put oil in the cylinder and see if it comes up.
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Post by cptk on Oct 2, 2011 16:21:45 GMT -6
It is correct that I have a few---thousand miles on it. I have been referred to as iron butt before. I will be checking the compression with my standard auto gauge next weekend. Am hoping I can get away with just replacing some gaskets like the right side I know for sure drips a drop when I park it. This is the first time with this machine that it has used a considerable amount prior to each thousand mile oil change. Thank you all for chiming in...and as always I was waiting fo JR's answer..Thanx again
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