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Makotosun

CT3 - 135 miles after rebore.

  • Bdee
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CT3 - 135 miles after rebore. was created by Bdee

I used yamaha piston and rings and had it bored out by Bill Bune Enterprises.   I see some scoring. on the intake side of the cylinder.  I can just barely feel the ridges passing a finger nail across them.

Is this a major issue?

 
18 Apr 2023 16:49 #1

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Replied by MarkT on topic CT3 - 135 miles after rebore.

Check air filter and boots.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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18 Apr 2023 17:09 #2

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Replied by Swoop56 on topic CT3 - 135 miles after rebore.

Cylinder wall looks quite dry . Perhaps check your oil pump is working , and output in spec too .
18 Apr 2023 17:53 #3

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Replied by RT325 on topic CT3 - 135 miles after rebore.

What was the reason you pulled the head. If it was running ok its best not to look--me thinks.
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18 Apr 2023 19:04 #4

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Replied by Bdee on topic CT3 - 135 miles after rebore.

I wiped it down for the photo.
18 Apr 2023 20:36 #5

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Replied by Bdee on topic CT3 - 135 miles after rebore.

I  am hearing what I would call a howl.  It's barely perceptible but I don't think I heard it before the new top end.
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18 Apr 2023 20:38 #6

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Replied by asco on topic CT3 - 135 miles after rebore.

Full synthetic oil in the oil tank or premix?

a
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1971 CT1-C (BRANDY)
1970 DT1-C (MONICA)
1972 AT2M (ZIFFLE)
1970 CT1-B (HULK)
1971 DT1E (GINA)
1970 CT1-B (CLIDE)
18 Apr 2023 21:32 #7

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Replied by msavitt on topic CT3 - 135 miles after rebore.

did you wash the cylinder with detergent after boring and before assembling?
scores look like contamination got in (e.g. intake), or was in (some grit from boring)
howling could be intake noise?
 
19 Apr 2023 08:52 #8

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Replied by Bdee on topic CT3 - 135 miles after rebore.


Yamalube 2s in the tank.
Last edit: 19 Apr 2023 11:47 by Bdee. Reason: spelling
19 Apr 2023 10:32 #9

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Replied by Bdee on topic CT3 - 135 miles after rebore.



no I did not wash with detergent.

I wiped it down with a rag soaked in acetone and blew it out with compressed air.  dam.  I forgot the detergent.

 
19 Apr 2023 10:35 #10

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