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Q on Meiss Pipe Mods for DT360

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Q on Meiss Pipe Mods for DT360 was created by pabdt

So...Dave Meiss modded my pipe.  Looks great and looking forward to hearing it.  but...

One question...was getting ready to mount it and noted no threads in pipe.  What do you guys think?  Was part of the mod sealing this or should I drill and tap new threads.  If tapped, does the thread hole extend in to the muffler cavity in stock form? 

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1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
2018 Yamaha R1 Team Yamaha Blue
2005 Honda CRF450R
Last edit: 16 Jun 2025 11:34 by pabdt.
16 Jun 2025 11:34 #1

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Replied by Sneezles61 on topic Q on Meiss Pipe Mods for DT360

What a conundrum. Would you be able to make a bracket to use both those holes? I’d be afraid of not much metal, drilling and tapping into the exhaust.
16 Jun 2025 14:55 #2

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Replied by Schu on topic Q on Meiss Pipe Mods for DT360

I just checked my DT360 pipe and the tapped hole does not break thru into the exhaust chamber. There is a threaded slug welded to the backside of that raised sub-plate. Hopefully these photos help. 

imgur.com/a/94zraho
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
The following user(s) Liked this Post: MarkT, pabdt, Ht1kid
16 Jun 2025 17:04 #3

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Replied by Schu on topic Q on Meiss Pipe Mods for DT360

Edit:
oops. I double posted….
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
The following user(s) Liked this Post: MarkT, pabdt
Last edit: 16 Jun 2025 17:15 by Schu.
16 Jun 2025 17:13 #4

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Replied by MarkT on topic Q on Meiss Pipe Mods for DT360

The threads missing doesn't seem like it would have anything to do with the sleeper pipe mod to me.  And yes, hole does not go through into pipe.  
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
16 Jun 2025 17:34 #5

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Replied by pabdt on topic Q on Meiss Pipe Mods for DT360

Schu, THANK YOU for the excellent pics!

The part probably just fell off from 50+ years of vibration and banging around in my garage. I've heard these mods work well for the pipe, so thinking I will weld in an internal threaded rod.
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
2018 Yamaha R1 Team Yamaha Blue
2005 Honda CRF450R
The following user(s) Liked this Post: Schu
16 Jun 2025 20:50 #6

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Replied by automan on topic Q on Meiss Pipe Mods for DT360

What's a Dave Meiss mod?

This site has zero search capabilities and old site not connecting.
17 Jun 2025 07:04 #7

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Replied by Gr8uncleal on topic Q on Meiss Pipe Mods for DT360

See link below.

Maybe it's the hardware I'm using (a pc), but the "Search Forum" function works fine for me.

Sleeper pipes - the beginning by DVM - Vintage Enduro Discussions
The following user(s) Liked this Post: AirborneSilva, Schu, Ht1kid, pahiker
17 Jun 2025 07:30 #8

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Replied by pabdt on topic Q on Meiss Pipe Mods for DT360

Interesting...Post #4 in that Sleeper pipe link shows my login handle, pabdt responding. That WAS NOT me! Noted, it was uppercase "PABDT".
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
2018 Yamaha R1 Team Yamaha Blue
2005 Honda CRF450R
17 Jun 2025 12:26 #9

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Replied by MarkT on topic Q on Meiss Pipe Mods for DT360

Pabdt - That happens when the person that originally posted is no longer a member here.  When I look at #4 it says "MarkT".  Note that your avatar will not be there and it will also say "visitor".   

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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
The following user(s) Liked this Post: pabdt
17 Jun 2025 12:54 #10

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