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Question 1975 DT175 Stumbles above 3500rpm

  • kwzl1
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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

It was at full throttle. That's all it will do.
26 Jul 2021 20:41 #21

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

thanks for the response. I will check out the tail pipe.
26 Jul 2021 20:43 #22

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

BTW, the weird video was taken while I was riding down the street with one hand on the throttle, holding my phone near the engine with the other hand in order to capture the sound. It just so happened I had the phone upside down. Should have just held  the camera with it pointing towards the engine so it would have been easier to see what was going on!
26 Jul 2021 20:50 #23

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Replied by RT325 on topic 1975 DT175 Stumbles above 3500rpm

Audio was more important & that was excellent thanks. I guess it was held wide open or something like it, as sounded constant. More open than the revs where its limit to anyway.
Just thinking, apart from what i've said in other posts, you could space the pipe back at the cylinder with a few washers between flange & cylinder on each stud to let it exhaust freely to a point but not get arrested for noise, Well, not a big lot of noise like if the exhaust was removed totally. First job still is remove tail muffler though as be surprised if its not in there.
Last edit: 27 Jul 2021 05:24 by RT325.
27 Jul 2021 05:15 #24

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

Thanks for your response. Yeah, it was taken with the throttle wide open.
I will check out the exhaust system this week, and hopefully resolve the problem.
I want to ride this thing!
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27 Jul 2021 09:07 #25

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Replied by Bigdog302 on topic 1975 DT175 Stumbles above 3500rpm

Keep us posted!

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2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!
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27 Jul 2021 11:40 #26

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Replied by RT325 on topic 1975 DT175 Stumbles above 3500rpm

piston in back to front--no, be all lean to the extreme not rich. ignore that.
27 Jul 2021 17:08 #27

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Replied by MarkT on topic 1975 DT175 Stumbles above 3500rpm

I can't remember the everything that was done...  are you sure the o-ring on the bottom of the jet setter is sealing good to the float bowl? 

I think 75 was the last year they used that system...  even though they didn't need it anymore.
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 Jul 2021 19:02 #28

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

I did replace the oring. When I put the bowl back on, it felt like it was sealing. Is there some way to test if it is sealing properly?
28 Jul 2021 20:37 #29

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Replied by Mothersbaugh on topic 1975 DT175 Stumbles above 3500rpm

A little grease on the O-ring will help seat it where it needs to be to seal well, and it will help tearing the O-ring as well.
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29 Jul 2021 06:08 #30

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