News:

Mat Oxley 1986 IOM TT


click above to read more about Mat.

Main Menu

Difference in YDS7 & R5 stock pipes?

Started by soonerbillz, February 18, 2023, 09:33:06 AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

soonerbillz

So the question came up on a FB thread and I don't think it was definitively answered.
I checked several sites for factory part numbers and of course now I'm just as confused as before.
Here's what I came up with...

1970:
No listings for YDS7 250 on any site


R5 350
Left-  278-14610-01-00
Right- 278-14610-01-00

Baffle -
278-14753-00-00
Or
278-14753-50-00




1971:

No listings for YDS7 250 on any site

R5 350
Left- 
278-14610-01-00
Or
278-14610-61-00

Right-
278-14620-61-00
Or
278-14620-51-00

Baffle-
278-14753-00-00
Or
278-14753-50-00




1972:

YDS7 250
Left-  278-14610-01-00
Right-  278-14620-51-00

Baffle-
278-14753-00-00
Or
278-14753-50-00


R5 350
Left- 278-14610-01-00

Right-
278-14620-61-00
Or
278-14620-51-00

Baffle- 278-14753-00-00
Or
278-14753-50-00

So I couldn't find YDS7 part numbers FOR 1970,1971
For 1970 the R5 was offered with only one type pipe but 2 different Baffle?
In 1971 the R5 was available with 2 different types of pipes and 2 different baffles.
In 1972 the YDS7 Prts show up.
YDS7 shows 1 version of pipes and 2 versions of baffles
R5 shows 1 version of Left pipe, 2 versions or Right pipe and 2 versions of the baffles.

There's gotta be part books with 70 & 71 YDS7 listing somewhere.
Still trying to determine what the version differences are by part number.
Seamed, not seamed by year?
Baffle differences?
250 vs 350 differences?



m in sc

pipes, the early r5 pipes have a seam. my 70 has those. the rest are the same pipes mechanically/visually.

r5 baffles are larger than ds7 ones internally, but either will fit either pipe, or rd 250/350 mufflers.

rd350 baffles fit right in, and actually flow better, i have some new reproduction rd baffles in my 70 r5.

i think the 2 part numbers is actually the superseded one, which is actually an rd 350 baffle.





they did not sell the 70-71 ds7 in the states, only the 72. I know they were available in the uk.

my suggestion, use rd350 baffles.

https://yambits.co.uk/rd350-exhaust-baffle-p-47061.html


'seamed' pipes, early:



non seamed pipes. these are actually r5 pipes, off a 72, but were identicle to the ds7 pipes except the baffle (on my ds7).


soonerbillz

Excellent breakdown mark thank you so much

AAAltered

As a random note, my 71 R5 had seamed pipes on it when I bought it.  It spent 26 years in a basement so I'm pretty sure they were original to the bike.
Perhaps there was a cutover during 1971 seams->no seams.
1971 R5
1976 RD200
2022 Moto Guzzi V7 850 Special

m in sc

the 71 i had also had seamed pipes, was an early one in production as well. so i agree that some 71s had them as well.