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Makotosun

Dt3 piston feedback

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Replied by MarkT on topic Dt3 piston feedback

Have you checked the ring end gap in the cylinder?  For some reason those rings look big...  probably just me.
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
27 Sep 2021 17:06 #21

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Replied by RT325 on topic Dt3 piston feedback

Umm, simple green--ok, who woulda thought. Ring peg looks like it's had a bit of a beating on one side.
27 Sep 2021 17:23 #22

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  • principal282
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Replied by principal282 on topic Dt3 piston feedback

I was wondering about that ring peg. 
is it gonna be a problem?
27 Sep 2021 18:05 #23

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Replied by principal282 on topic Dt3 piston feedback

0.20 mm 0.20 mm 
Last edit: 25 Apr 2022 17:50 by Enduronut.
27 Sep 2021 18:12 #24

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Replied by MarkT on topic Dt3 piston feedback

That's unusual...  Yamaha rings are usually on the edge of a "too big" gap.  Strange to have rings at lower end of range in a worn bore.

Can you take a magnifying glass and check stampings in top of rings near gap?
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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27 Sep 2021 18:24 #25

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Replied by RT325 on topic Dt3 piston feedback

Shouldn't tell ya but--i just hold them up to the light & yep she'll be good--not recommended lol but not had a problem. Wonder how much they actually grow to close the gap in reality.
Ring peg looks hollow so i dunno--it'll be ok till ya bore it i guess.
27 Sep 2021 18:32 #26

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Replied by principal282 on topic Dt3 piston feedback

 
Last edit: 25 Apr 2022 17:54 by Enduronut.
27 Sep 2021 18:48 #27

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Replied by principal282 on topic Dt3 piston feedback

Part number lines up for std 

311-11610-00 
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27 Sep 2021 18:51 #28

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Replied by MarkT on topic Dt3 piston feedback

Can't see any size number like .25 on the top edge of rings in your pics...  so probably are standard.  Just unusual to see a tight ring gap.

(I've seen a lot of mis-boxed parts so always pays to check)
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
27 Sep 2021 20:05 #29

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Replied by principal282 on topic Dt3 piston feedback

Thanks Mark. I think it should be okay. Waiting for a bottom. Gasket, and stuff to hone cylinder with. Hopefully soon.
27 Sep 2021 20:13 #30

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