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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

Stock main jet is 160. I dropped it to a 150, and there was no change.
To test if the exhaust is restricted, would removing the exhaust system to see if will rev determine if that's the problem?
25 Jul 2021 10:35 #11

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

Well, I learned how to upload video to youtube today.
Here is a link to video showing what the bike sounds like:https://youtu.be/ojH46nBhUxc

Hope this works.
Last edit: 25 Jul 2021 12:59 by kwzl1. Reason: deleted extra text
25 Jul 2021 12:52 #12

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Replied by darinm on topic 1975 DT175 Stumbles above 3500rpm

Have to change the setting so it's not private then I'm sure we'll have something to say!
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
2013 Yamaha XT250
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25 Jul 2021 13:05 #13

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

Thanks. I obviously don't have experience posting on youtube. I changed the status to public. I hope it works this time!
25 Jul 2021 20:52 #14

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  • RT325
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Replied by RT325 on topic 1975 DT175 Stumbles above 3500rpm

not so far.
26 Jul 2021 00:32 #15

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

It is set to public. When I click on this link  :

it works for me. Not sure why it's not working for others.
26 Jul 2021 08:38 #16

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

When I click on the link I see an inverted video of someone walking with camera recording for 5 seconds.
 
Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
26 Jul 2021 09:08 #17

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Replied by kwzl1 on topic 1975 DT175 Stumbles above 3500rpm

No sound? That's the important part.
26 Jul 2021 12:10 #18

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Replied by Bigdog302 on topic 1975 DT175 Stumbles above 3500rpm

I hear the sound of a two stroke along with a upside down image going by some houses. I still think you have a plugged up pipe. it sounds like my 1973 Suzuki TS50 did when the pipe was plugged up, when my Dad took a torch to it and it smoked like crazy, once the smoking stopped we put it back on the bike, the bike ran so much better it was hard to believe it was the same bike. this is when I was 13 years old, I am over 50 now btw. That old 50 did not have a silencer in it either.

same thing happened when I put on a Bassani pipe on my 1970 RT1M, until it blew out the mouse nest then it suddenly came alive. like your bike it would not  rev above 3500-4000 rpm at full throttle momentarily then it exploded to 6000 or 7000 rpm with the front wheel up high. or course I had it at full throttle during those revs and it was a wonder I did not loop it out.

was your bike at full throttle in the video or a little lower?
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!
Last edit: 26 Jul 2021 13:29 by Bigdog302.
26 Jul 2021 13:15 #19

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  • RT325
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Replied by RT325 on topic 1975 DT175 Stumbles above 3500rpm

Yep still go with a very blocked pipe. Try it minus the tail muffler & look down in the end where muffler fits in. Have seen them build up a ring of carbon that grows until very restricted. Had a 100 twin where the complete header pipe was full bar a small hole through it all. Reminds me of an IT250 & a PE400 that came to me in a similar state & barely run above 1/4 throttle.
Last edit: 26 Jul 2021 18:33 by RT325.
26 Jul 2021 18:31 #20

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