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Post by 4950cycle on Sept 11, 2016 11:43:22 GMT -5
I was wondering if anyone's ever done a compression test on their 257 cc Linhia engine ? I did mine today after only 7,000 miles and I only got about 135 psi on a cold compression test. I would have done it motor warm like I am supposed to. But I have had bad experiences messing with aluminum spark plug holes while they are hot. I do engines cold now and still get a pretty good base line compression reading IMO. Seems kinda low to me for a fairly fresh engine though. Any feedback anyone ?
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Post by crawford on Sept 11, 2016 13:12:14 GMT -5
my zodiac as about same cc's Myself when new it had 165 psi now with 5,000 miles 165 my question is did you do a compression new to use a base line? 2 how often do you change oil'what kind do you use? are you using compression gauge right if you are maybe check you valves for right gap.
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Post by Rebel on Sept 11, 2016 20:29:15 GMT -5
I am not sure what the specs are for this motor but it sounds good enough for it to run. Does it burn oil?
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Post by 4950cycle on Sept 17, 2016 14:17:31 GMT -5
It runs fine. I broke in right by the book. I use 20-50 Castrol fossil. have for 35 years with excellent results. And no, I never did a compression test when new. So no base line. Oh... And oil change every 1000 or so miles. Oil always looks almost new when draining crank case for oil change. Guess I just got a weak motor off the assembly line.
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Post by 4950cycle on Sept 17, 2016 14:26:57 GMT -5
Update, Just did a warm compression test with loaned comp gauge from Oreiley's . I got 132-135 psi again. My comp tester must be correct I guess. Then did wet test and it bounced up to 150 psi. So my take is rings have some wear and valves might be slightly leaking. And I believe Crawford is right when he said I should have about 165 lbs psi engine in good shape.
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jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on Sept 17, 2016 18:25:11 GMT -5
Maybe it's time for a valve adjustment
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Post by 4950cycle on Sept 17, 2016 20:27:25 GMT -5
Maybe it's time for a valve adjustment Just did it a week ago. |
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Post by crawford on Sept 22, 2016 12:31:09 GMT -5
I think your oil should have be 10-40 or 15-40
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Post by 4950cycle on Sept 23, 2016 19:54:12 GMT -5
That is what I'm gonna do. After I find out why I have no spark I'm gonna change my oil to at least 15-40 if not 20-50 Castrol.
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CAN YOU HELP ME OUT MAN,AS i LOST ME JOB DUE TO NOT BEING ABLE TO GET THERE?ANY INF