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Penton Owners Group

General Discussion => Wanted / For Sale => Topic started by: rpage11 on February 06, 2016, 02:08:41 PM

Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 06, 2016, 02:08:41 PM
I'm restoring a 77 250 gs6 and I'm looking for a pipe in good condition.  The bike came with a nice pipe and I thought all I needed was the correct tail piece.  I found one on ebay and when it arrived today I realized that I either have the wrong pipe or wrong tail piece.
(http://i63.photobucket.com/albums/h149/rpage11/image.jpg2_zpsy6rzwvgt.jpg)

(http://i63.photobucket.com/albums/h149/rpage11/image.jpg1_zpsflhvfzdf.jpg)

(http://i63.photobucket.com/albums/h149/rpage11/image.jpg3_zps1kjbizij.jpg)

This might be an mc5 pipe.  If anyone has a pipe they would like to trade for this one, I'm open.  The tail on the pipe I have is about 2 5/8" dia. and the new tail piece is 3 1/4"

Thanks for all the help everyone provides on this forum.

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 06, 2016, 02:39:39 PM
Quotequote:Originally posted by rpage11

I'm restoring a 77 250 gs6 and I'm looking for a pipe in good condition.  The bike came with a nice pipe and I thought all I needed was the correct tail piece.  I found one on ebay and when it arrived today I realized that I either have the wrong pipe or wrong tail piece.
(http://i63.photobucket.com/albums/h149/rpage11/image.jpg2_zpsy6rzwvgt.jpg)

(http://i63.photobucket.com/albums/h149/rpage11/image.jpg1_zpsflhvfzdf.jpg)

(http://i63.photobucket.com/albums/h149/rpage11/image.jpg3_zps1kjbizij.jpg)

This might be an mc5 pipe.  If anyone has a pipe they would like to trade for this one, I'm open.  The tail on the pipe I have is about 2 5/8" dia. and the new tail piece is 3 1/4"

Thanks for all the help everyone provides on this forum.

Edit  Can anyone tell me if this is the pipe I'm looking for?
http://www.ebay.com/itm/321976888290?item=321976888290&viewitem=&vxp=mtr

Skip Page
Tucson, AZ
//www.robertpagearchitect.com

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 06, 2016, 03:46:32 PM
Looking at the ebay pipe closer the inlet doesn't look to be the same as the pipe I have.  Anyone else agree?  Thanks

http://www.ebay.com/itm/321976888290?item=321976888290&viewitem=&vxp=mtr

my pipe
(http://i63.photobucket.com/albums/h149/rpage11/Screen%20Shot%202016-02-06%20at%2012.37.19%20PM_zpsq9udjfuy.png)

ebay pipe
(http://i63.photobucket.com/albums/h149/rpage11/Screen%20Shot%202016-02-06%20at%2012.35.45%20PM_zpseossg3vl.png)

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 06, 2016, 07:14:15 PM
Skip, the pipe you have pictured at the top of the page looks to be a GS-6 pipe that had been cut off short and then the silencer pop riveted to it before it reached its full size. The eBay listing pic is a 78 mc5 style torque pipe. They did not use that style until 1978, and did not use it on either 77 or 78 GS-6 bikes. You might be able to fabricate a shroud extension and have it welded on where the silencer is pop riveted into place to be able to fit the GS-6 silencer. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 06, 2016, 07:17:38 PM
Quotequote:Originally posted by 454MRW

Skip, the pipe you have pictured at the top of the page looks to be a GS-6 pipe that had been cut off short and then the silencer pop riveted to it before it reached its full size. The eBay listing pic is a 78 mc5 style torque pipe. They did not use that style until 1978, and did not use it on either 77 or 78 GS-6 bikes. You might be able to fabricate a shroud extension and have it welded on where the silencer is pop riveted into place to be able to fit the GS-6 silencer. I have a stock 78 GS-6 pipe at home that I can provide measurements from to verify, but I will not be home till Monday evening. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico


Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 06, 2016, 08:24:07 PM
Thanks Mike. I know someone in town that can handle that pretty easily. If you could send measurements next week it would be greatly appreciated.  Thanks again

Does anyone know where I might find a center stand?

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 06, 2016, 08:41:58 PM
Looking at comparison pics, the pipe you have may actually be a 77 MC5 400 pipe based on the size of the silencer, being larger and longer than a 250. The pics I found have a bigger diameter shroud throughout. Search for a post called Pipe Identification with s couple of GS-6 pipe pics near the bottom of the post. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 06, 2016, 08:49:54 PM
That's what I thought I saw in pictures too.  The shroud is longer and straighter like the pipe in the Ebay posting.  Might still be looking for a pipe?  Thanks for your help.

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 06, 2016, 08:59:29 PM
Mike
I saw the pipe in the post you mentioned.  If this is a 400 mc5 pipe and I extent the tail to fit the new shroud, how do you feel performance will be affected?

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 07, 2016, 11:43:13 AM
I'm not sure about the performance different because the 400 pipe has a slightly larger necked down area in front of the silencer than most 250's but only about an eighth of an inch difference in size. The GS-6 pipe although shrouded would probably still have that same necked down area under the shroud. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: slvrbrdfxr on February 07, 2016, 12:17:53 PM
Skip and Mike
After recently building both a 77 250 and 400 GS6, my opinion is the pipe in question is for a 77 250 MC5. I've got exact same pipes on the two 77 250 GS6 that I've built. Doesn't appear that the back end has been cut off either. Someone just pop riveted a silencer on in place of an end cap. One thing I see which tells me it's a 250 pipe is the upward angle of the head pipe going into the cylinder. The 250 and 400 GS6 bikes use different exhaust spigots on the cylinder and the 400 head pipe is noticeably straighter going into the cylinder. I've got pictures of the pipes I used building both bikes and will try to send them to Mike later today so he can post the pics.
Dave McCullough
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 07, 2016, 12:24:16 PM
Dave
If you would like to send them to me too, I'll post them.

[email protected]

Thanks

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 07, 2016, 01:03:21 PM
This silencer on the 400 is 2 inches or so longer than the 250, besides the necked down area being larger on the 400. I may have the dimensions on another post somewhere and I will look for that and add to this post. Some 400's had the angled inlet and some the straight inlet.
I found the post. Search MC5 250/400 pipes. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 07, 2016, 01:27:47 PM
According to Mike's post in MC 5 250/400 pipes, this would be a 250 pipe.  Dimensions are: core 7/8", inlet at stinger 1 1/4" and length just over 10".  The new tail piece for the gs6 pipe has a core diameter of 1 1/8".  That seems to settle that.  Anyone have a 77 gs6 pipe?

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 07, 2016, 03:40:52 PM
I have a nice one, but at some point I will need one for my 78 GS-6. If you can't find one let me know and maybe we can work something out. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 07, 2016, 04:54:16 PM
Thanks Mike. I have a month or two. I just finished priming the frame.  If you come across something keep me in mind.

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: Carl Hill on February 08, 2016, 08:13:58 AM
I have a new pipe for a GS6 that I think may be for a 175. What is the diameter of your exhaust spigot?
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 08, 2016, 12:14:00 PM
If you're talking about the tail piece diameter it is 3 1/4".  From my understanding the 250 and 400 pipes are much different at the inlet than the 125 and 175 pipe.

(http://i63.photobucket.com/albums/h149/rpage11/Screen%20Shot%202016-02-08%20at%209.07.31%20AM_zpsva5ud5h0.png)

Pipe 70 in the parts book is for 125/175 and has the two springs connection.  Pipe 070 is the 250/400 pipe and has the single spring connection.  Thanks

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
Title: Wanted 77 250 gs6 pipe
Post by: Carl Hill on February 08, 2016, 01:42:38 PM
Mine has 2 springs. Diameter where it goes into cylinder is 43 mm. I think 250 is larger. You may want to check.
Title: Wanted 77 250 gs6 pipe
Post by: 454MRW on February 21, 2016, 07:37:42 PM
Skip, Pics sent. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico
Title: Wanted 77 250 gs6 pipe
Post by: rpage11 on February 21, 2016, 11:39:18 PM
Quotequote:Originally posted by 454MRW

Skip, Pics sent. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico


Mike, got them, thanks Skip

Skip Page
Tucson, AZ
//www.robertpagearchitect.com
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