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Makotosun

1988 DT50 Electrical

  • Dave in WI
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Replied by Dave in WI on topic Re:1988 DT50 Electrical

I did some Googling and come across your posts on DT50 compression Mark. My service manual does not list a number. With a mighty 5:1 compression ratio, I can see you’d get low readings.

I did get a new 12T front sprocket so I can switch over. That’s what it had before. With the 13T it seems to have the same top speed at 45mph.

I’ll probably just keep running it until I lose power, or it gets hard to start. That’s usually an indicator of low compression.

What I really need to do is get a little bigger enduro for those trips out of the neighborhood.


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04 May 2021 13:37 #21

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Replied by Dave in WI on topic 1988 DT50 Electrical

Does anyone with a DT 50 have the oil dipstick? I don’t have it in my tool kit. I’m pretty sure my gear oil is overfilled as it is to the bottom of the Threads. I’m pretty sure it should be lower than that but I’m not sure how much. Anyone has this and can give me a length measurement of the dipstick I would really appreciate it. I do need to change my gear oil, it does not look very good.

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Last edit: 14 May 2021 09:12 by Dave in WI.
14 May 2021 09:11 #22

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Replied by RT325 on topic 1988 DT50 Electrical

Many times over the years i've seen underpowered smaller twostrokes caused by transmission filled to the top. People see a hole & fill it up, then the drag slows it down. Drain fully & fill with correct amount, which will be way down near the bottom of the clutch so its not paddling through it.
14 May 2021 15:16 #23

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Replied by MarkT on topic 1988 DT50 Electrical

I have one, the question is where?  I looked around and haven't found it. 

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Draining and refilling with correct amount is the best way to do it. 

P.S.  For some reason the dipstick came with the owners manual, not in the tool kit.  That how I got mine.  Bought a NOS owners manual and it was in the sealed bag.
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
14 May 2021 20:30 #24

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  • Dave in WI
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Replied by Dave in WI on topic Re:1988 DT50 Electrical

Yeah, it needs to be changed anyway. I’ll just do that. I’m sure the capacity is in my service manual.

It does seem to have a slight leak after riding but I haven’t been able to pinpoint it yet. Could be the shifter or countershaft seal. The oil tank lid doesn’t seal 100% and some splashes out when riding. Hoping if I get the right amount in the leak will stop... a guy can dream.


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15 May 2021 06:37 #25

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Replied by Dave in WI on topic 1988 DT50 Electrical

Mission accomplished. Last night I drained the old oil out. It looked very bad, kind of gray. I used a very old container of Yamalube and filled it up to 700 mL. Then I took it for a ride around the block. I figured I would perform a semi-flush of the transmission.

This afternoon I drained that and put in 700 mL of new shell 10W-30. It appears to be filled to the correct level now. And shifts great.


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Last edit: 20 May 2021 05:08 by Dave in WI.
19 May 2021 15:12 #26

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Replied by Dave in WI on topic 1988 DT50 Electrical

 So a quick update on the 50.  I ride it around the ‘hood once or twice a week.  Top speed has gone up, from 45 all the way to 46mph!

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I ordered some yellow fork boots off eBay.  I measured the ones on the bike and if the listing is accurate, these should be pretty darn close.  We’ll see once I get them.  Coming from China so who knows how long it will take.   The boots are listed as for a Suzuki GS125.

also in case anyone is looking for a DT50, I saw on on Facebook Marketplace in Muncie, IN.  White and red, looks pretty nice.
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Last edit: 19 Jun 2021 07:14 by Dave in WI.
19 Jun 2021 07:03 #27

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Replied by BenDT80MX on topic 1988 DT50 Electrical

I don’t if you have a wiring diagram for a 1988 DT50, but if you do would there be anyway you could send me some pictures of at as I’m trying to restore mine and I cannot find any wiring diagrams for it
10 Nov 2022 11:50 #28

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Replied by MarkT on topic 1988 DT50 Electrical

I think pictures are down.  If you send me a PM with your email address I will try to send you the diagram.

What issues are you having?  I've had about 4 DT50's so I have a little experience with them...  I think I still own 3 of them.  
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
10 Nov 2022 12:40 #29

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