250 Exhaust

[Chrisbo]

POG, Can anyone tell me the part number for a 1980 250 exhuast or better still is it the same pipe as a 1978 MC5 250 [?] Lastly where is the actual part number stamped on the pipe as I can only find 54 stamped on mine.

Cheers Poggers [8D]
Chris.

[OUCWBOY]

Hi CHris,
The part number for the 1980 250 is 540.05.170.900 and the part number for the Muffler end is 540.05.071.900 unless it is a GS, then the part number for the Silencer is 550.05.071.700. I don't have the part number for a 1978, so I can't tell you if they were the same or not, but I don't think so.

Donny Smith

[Chrisbo]

Thanks Donny, I've got the part number for a 78 here, it is 54.05.170.800. Is the full number stamped anywhere on the pipe itself as I can't find it anywhere, all I can find is KTM 54 and I'm sure it's a 1980 pipe I have and not a 78.

Thanks again Donny
Cheers
Chris.

[Dennis Jones]

I believe the 78 & 79 are the same.They have a built in silencer about 2 1/2" in diameter that runs from under the seat to just past the side cover. In 80 or 81 they went to a bolt on silencer. Don't take that as set in stone but I have had some pipe troubles in the last year and that is what I have observed.

Dennis Jones

[Chrisbo]

Thanks Dennis, Chances are it might fit O.K. and it's just the silencer that will be different.

Cheers
Chris.

[454MRW]

I have an early 1980 that I do not have an original design exhaust pipe for, but I compared my 1978 MC5 pipe to one Phil Ketchums 1979 and his 1980 250's and they looked identical to the naked eye, however, when I put my 1978 MC5 stock pipe on the 1980 it was very hard to get all of the mounts to line up. I also put my brothers 1978 MC5 250 pipe on my 1978 MC5 250 and it was the same story, a very tight fit to get all the mounts in, so it seems that they may have varied slightly from bike to bike as far as fit.
I would really like to have a stock 1980 pipe for my bike, with the built in silencer. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 250'S