Pipe Identification

[maurice reynolds]

Can anyone id the dirtier of the 2 pipes, it was bought for a 77 MC5 250 but the header pipe angle is wrong.
the shiny clean pipe is the proper header pipe angle for a 250.
Maurice

[454MRW]

It would help if you pictured the entire pipe side by side along with the painted one. Somewhere around later 1977 the exhaust manifold was changed from a straight outlet to an outlet that was angled downward. It could be the correct pipe for the angled manifold, possibly a late 77, or it could be for the smaller angled outlet on the 175. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[brian kirby]

I'd bet its for a 175. Is the ID of the pipe at the manifold the same? If it does end up being for a 175 I would be interested in buying it.

Brian

[maurice reynolds]

here are the side x side pics, by the parts book the 175 definitely angles like this

[454MRW]

The body of the pipe looks too large to be a 175, in fact it almost lookes that the front pipe area before it tapers larger is bigger than the painted pipe. it may be a MC5 400 pipe that the rear silencer tip has been replaced. The painted pipe looks like it has the longer 400 silencer welded onto it; the stock 250 silencer is 10 1/2 inches from the weld line to the tip of the end cap, and is only 1-1/4 inches diameter at the weld, and the stock 400 pipe has a silencer like the one on the painted pipe, only a couple of inches longer with a larger diameter at the weld, like the one pictured on you painted pipe. Which ever ipipe t is, the engine is using the angled down exhaust manifold for sure. Here is a pic of my NOS MC5 250 pipe with the stock silencer. Mike





Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[maurice reynolds]

The painted pipe is from my 400, just using it to show the header pipe angle i need

[454MRW]

That other pipe shows a dent similar to a late 77 GS6 pipe near the front down tubes of the frame. I would put a
downward angled exhaust manifold on your bike and use it. If you want it to look correct, Parmabike sells Pillordino's correct reproduction silencers on eBay and offers a 10% discount to POG members if you order directly from him. Mike




Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[maurice reynolds]

Any idea where to locate an angled exhaust flange

[454MRW]

After late 77, it was standard on 250-400 engines, and may be the same size as the 420. This one pictured on eBay is the most common one, or call Gary Ellis 217-260-0237 and he might have one to spare. Mike
http://www.ebay.com/itm/360333871243?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_1347wt_904

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[maurice reynolds]

Spoke to Gary earlier today, he thinks he has some and will get back to me later today,Al Buehner still has some new ones when I checked with him and I need to order a few more parts from him anyways so would be almost the same price as the 1 on ebay you linked, also Marsattacks is checking to see if he has the 1 that came with that pipe.(thats who sold it to me)
All in all it turned out to be a relatively easy fix

Thanks for the help

Maurice

[maurice reynolds]

Mike... I ordered a downward exhaust flange from Al Buehner $45 and it still does not fit. The header fits in now but the brackets are not close. The front pipe bracket is 1 1/4" too high and the pipe is 1/2" from the threads on the left petcock no room to screw the petcock on. The rear bracket is the right height but is 3/4" short of the rear mount.
Here are pics of it now
It doesn't seem like this pipe is for a 77 mmc5, any other ideas

[marsattacks]

Any ideas greatly appreciated.  We will get to the bottom of this!  Mayybe this is not a KTM pipe?  Maybe someone will need it?  Maybe it will turn out to be for a CT-90?

[454MRW]

Not unless it fits a MC5 400 with the angled exhaust manifold in place, since as I mentioned earlier, that the size of the front header pipe looks larger than your 400 painted pipe in the pic. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[maurice reynolds]

Is there a difference in the mounting points on the frame of a GS (high breather frame) compared to the MC5 and could this be what this pipe fits.

[454MRW]

Starting in 1977, the GS-6 has a fully shouded rear section with a large removable silencer end piece, which this is obviously not, as evident of the pipe where the silencer is welded onto it. I do not know if there was an MX version of that pipe, but also as I mentioned earlier, the front section with the dent looks like the 77-78 GS250 front pipe, as I have a 78 GS6 250 and my brother has a 77 GS6 250, which both have the downturned manifold. I am not aware of the downturn exhaust flange being used before mid to late 77, or it could be a 75-76 Cross Country MX pipe, but I am not sure if there was an MX pipe for that bike, which is why I figure the MC5 400 which would at least position the front mount in a different location than the 250. Here are pics of a 77-78 GS-6 250 pipe. Mike




Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R