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DT250 Exhaust Stud

  • peteyam54
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DT250 Exhaust Stud was created by peteyam54

One of the studs that holds the exhaust to the barrel/jug on my DT250A has sheered. The part (39214-6510000) seems to be unavailable - from the parts diagram it looks like M6 on one end and M8 on the other, but I don't know the respective thread pitch or length. Does anybody have one they could measure or sell if spare? Thanks
13 Apr 2021 08:09 #1

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Replied by mdscott on topic DT250 Exhaust Stud

I had the same broken stud, I ended drilling and removing the 6mm piece in the cylinder, drilled and tap to a 8mm stud with a heli-coil. 
Thanks Mark
Roseville, Ca.

'06 GL1800
'98 KDX220
'75 Norton
'73 CB500K
'01 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
‘69 Honda CL350
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13 Apr 2021 08:14 #2

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Replied by mdscott on topic DT250 Exhaust Stud

Here are pics. 



  
Thanks Mark
Roseville, Ca.

'06 GL1800
'98 KDX220
'75 Norton
'73 CB500K
'01 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
‘69 Honda CL350
The following user(s) Liked this Post: pabdt
13 Apr 2021 08:16 #3

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Replied by Gr8uncleal on topic DT250 Exhaust Stud

+1

Might not even need a helicoil, just put a 8mm tap through it.

Pitch is likely to be standard.
13 Apr 2021 08:18 #4

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Replied by mdscott on topic DT250 Exhaust Stud

Probably right not needing the heli-coil, I like to overkill stuff, lol. I happened to have the heli-coils in my tool box. 
I didn't realize the part in the head was a 6mm stud, so when I tightened the 8mm nut to the tightness I always have it snapped.

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I've been a mechanic all my life so you have a feel of bolt tightness. 

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Thanks Mark
Roseville, Ca.

'06 GL1800
'98 KDX220
'75 Norton
'73 CB500K
'01 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
‘69 Honda CL350
13 Apr 2021 08:28 #5

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Replied by MarkT on topic DT250 Exhaust Stud

Air cooled VW's used the 6mm/8mm stepped stud for repairs...  I think you can still find them.  I will look later

6 x 1.0 and 8 x 1.25
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
13 Apr 2021 10:28 #6

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Replied by RT325 on topic DT250 Exhaust Stud

That was one of Yamaha's bad moves running 6 in the cylinder with an 8 to pull the exhaust up tight. Make you wonder what they were thinking that day. Probably told the apprentice in the cylinder machine shop at the factory to make them 8 stepped down to 6 but he got it reversed.
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13 Apr 2021 13:46 #7

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Replied by MarkT on topic DT250 Exhaust Stud

There are tons of 6mm by 8mm stepped studs for sale online, ebay and a lot of VW shops sell them.  Here's one auction on ebay with a lifetime supply for $8.  Amazon probably has them too.  Last time I needed one I still had one in my old VW stuff...  good hardware store might have them too.

VW TYPE 1 3 ENGINE CASE OIL SUMP STEP STUD KIT 6MM/8MM BUG BUS GHIA SUPER BEETLE
Buy It Now
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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13 Apr 2021 15:32 #8

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  • peteyam54
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Replied by peteyam54 on topic DT250 Exhaust Stud

Thanks for all the replies and helpful suggestions. I've managed to find a couple of long stepped studs that will need cutting down, but should do the job. If that fails, I'll tap an 8mm in.

Not one of Yamaha's best designs! Cheers
14 Apr 2021 04:34 #9

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Replied by ldw72120 on topic DT250 Exhaust Stud

Ace Hardware had them locally in their metric stud drawers.  No, I can;t imagine why. 
 
18 Apr 2021 11:16 #10

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