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Makotosun

CT3 - 135 miles after rebore.

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

What would you (anyone) recommend going forward? a hone and new rings?
19 Apr 2023 10:38 #11

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

Can't undo if it was grit from machining...  looks more like sucking dirt to me though.  Might check what I said in post #2 as that is something you can fix. 

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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
19 Apr 2023 10:41 #12

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


The air filter to carb boot was clean but oily.

There was some grit on the bottom of the air filter housing.

This is the filter now:

  
Last edit: 19 Apr 2023 11:51 by Bdee. Reason: removed duplicate paragraph
19 Apr 2023 11:50 #13

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

Comment about boot was to make sure it was sealed and not allowing unfiltered air into engine.

Filter needs to be lightly oiled... that one "looks" completely dry? Dry foam filter will let dirt pass.
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
19 Apr 2023 12:09 #14

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

Oh, gotchya. The boot was sealed.

The filter is slightly oiled but much less then when I applied the oil two years ago.

Thanks for your help!
19 Apr 2023 15:24 #15

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

Gravity will slowly drain oil from foam.  Best practice is to clean and re-oil before riding if it's been six months since it was last done. 

Of course if you ride a lot or in really dusty conditions you'll want to clean and re-oil more often. 

As far as the marks, it'll be fine.  make sure it's getting oil...  oiling cylinder again before you put head on is a good idea...  and just ride it. 

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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
19 Apr 2023 16:26 #16

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

I think ya worrying about nothing. It's just settling down the cross hatch honing marks. In saying that, i expanded the pic up close & can't see obvious chamfer on the transfers so has me wondering if the exhaust is like that --& the inlet. I 'think' the thrust is on the inlet after bdc on the way up? [help me someone] & thrust on exhaust side on the way down?. Chamfer on the transfers isn't 'as' important as no side thrust. Just my warped theories but still think ya worrying too much. A whine sounds better if you have a 'wine'. Won't be due to cylinder issues. If it's audible then please post a vid or audio of it when back up & running. Could look up the exhaust port & the inlet with reed removed & see how the rings & skirt look!!. Then post pics.

I missed all the comments from #11 on. As usual i'm on the wrong page lol. Up to speed now.
Last edit: 19 Apr 2023 16:44 by RT325.
19 Apr 2023 16:37 #17

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

Going Forward:

1. remove air box clean soap and water.
2. run the oil pump with yama-lube 2s.
3. pay attention to details always.
4. don’t run too hot a spark plug.
5 keep your jetting rich ( chocolate brown ).
6. have fun - vintage requires 5 times the work.

a minus
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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)
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19 Apr 2023 19:44 #18

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

Thanks for everyone's help. That will keep me busy for a couple of days. I was just about to contact enduronut for a 2nd o/s piston + rings.

A MityVac compression tester, while the engine was around 100 degrees fahrenheit, said I had 132 feet pounds.

The spark plug was black until I adjusted the oil pump a couple of weeks ago. The plug is now a very dark chocolate. Been running B8ES. I stocked up.

For fun and my edification I will remove the reed block and take some photos of the piston and rings as suggested by RT325 over the weekend.

I am pretty sure the ports are chamfered; I did not feel any sharp edges.

Would it be worth the time to take off the jug and wash it with detergent now?
20 Apr 2023 11:12 #19

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

Need to eyeball in the exhaust port to view the rings but can view the skirt on inlet & exhaust. Might see a bit of the rings at bdc on inlet though--can't think.
20 Apr 2023 15:16 #20

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