Not sure if it is better i start a new topic or if i should ask that in one which already exists and is on the same subject but as my question is specific about some particular years , i thought it might be better to start a new one ( if i should have asked that in one existing already , just tell me for next time ).

I would like to know if the full exhaust systems of the CBR 900RR made from 1994 to 1997 ( included ) , are fully compatible / interchangeable or not ?
I mean , if i buy a full exhaust system made for any year of 900RR from 1994 to 1997 included , is it possible to mount it on any CBR900RR made from 1994 to 1997 ?

I took a look at the parts number and the schematics of the 1994, 95, 96 and 97 on :
https://www.bike-parts.fr/honda-moto/900-MOTO/CBR
1994 900RR and 1995 have the same parts numbers and are fully compatible ( both the full exhaust system and the muffler alone , are interchangeable between the 1994 and the 1995 900RR ) and both the 1996-1997 have the same parts numbers , so are also fully compatible, but parts numbers in 1994-1995 900RRs are different from the ones on 1996-1997 ones !

I read in another topic ( 900RR exhaust compatibility ) speaking about mufflers compatibility that :

" The 93-95s are the same, 96-99s are the same. On the 93-95s if you look at the 3 bolts on the can they form a triangle, one bolt is at the top( I think). On the 96-99s one bolt is at the bottom. The bolt pattern is exactly the same just rotated 180 degrees. If you mount a later year can, the exhaust tip points in the wrong direction. You can get the mid pipe cut, rotated and re-welded then use the later cans.

You can always get a completely new mid pipe, which should come with the new slip on end with springs and use any new modern pipe you want, buit that's pricey. I just kept looking on EBAY until I found a carbon fiber yosh for my year (94), and it was $140 shipped if I recall. You can get aluminum ones for under $100."



From what i saw on the Schematics with parts numbers , it seems the full exhaust system is made of two parts only, the header SP4-1 / collector and the muffler , cause , as the person in the post i quoted above , was speaking about a middle pipe, i was wondering if it was an exhaust system made of 3 part , a header SP4-1, a middle pipe and a muffler but no; it's only 2 .
Based on what was said in that post , i understand mufflers are interchangeable between 1993 , 1994 and 1995 exhaust systems but not with 1996-97 ones ,due to the places where are the bolts but i don't know if a full exhaust system from a 1994 or 1995 900RR , can be mounted easily on a 1996-1997 900RR and Vice-Versa ?

 

Nobody knows about that ?
i am surprised , with so many 900 CBR experts and lovers of this motorbike !
i would be tempted to think that any full exhaust system from any 900RR from 1994-1995 to 1996-1997 ( which seem to be only two different models ) would be possible to be installed easily on any of those years of 900RR but i would like to get confirmation !

 

It does seem to find an answer to this, I am looking at using a '98 '99 system on a '96 and at this point I am not sure if it will work

I have just bought a stainless set of headers off I believe a '99 RRX to fit to my '96 RRT. My bike currently has mild steel headers with some damage on the outside bend just before the silencer, a couple of dents from when the bike has been down some time.

The bike has a Micron can at the moment. I have also bought an aluminium can marked Sankei 2361, which I also believe is off an RRX, but I have also seen that they may have been used on the 929 RRY model.

I haven't yet offered either of these up to the bike to see if they fit. I had seen something about the mounting holes for the silencer being in different positions.

I am not intending to fit the new exhaust to the bike for a while yet, but I will take a look in the next few days to see if it looks like they will fit.

It would be good if there was a clearer compatibility guide across parts.

 

Have you checked if the parts number are the same or different, in the years you are interested to know about the compatibility /interchangeability ?

i just checked and neither the header nor the muffler seem to look the same on 96 ones and 98 ones and they have different parts number as well :

https://www.bike-parts.fr/honda-moto...F__1900/2/3307

https://www.bike-parts.fr/honda-moto...F__1800/2/3336

The headers seem to have different shapes and the mufflers don't have the same diameter it seems !

 

It's going to be interesting. I hadn't seen those schematics. I had read that the mount in the middle may need to be "adjusted" in another thread, and it does look that way in the diagrams. We'll see. I bought these at a good price, so if I end up selling them on it won't hurt too much. But I will be dissapointed if it turns out I can't use them.

I am not rushing to do the swap. The riding season in the UK won't last much longer and I don't want to end up with the bike off the road doing something that isn't necessary at the moment. I have bitter recollections of stripped/snapped exhaust studs! So it will probably be a few weeks before I look at it. I will report back how I go on.

I will probably start a thread about the refresh of this bike. It has a few things that I am going to attend to. Nothing major, just the impact of a lot of owners over quarter of a century!

 

@rem1859 Removing the exhaust shouldn't take more than about 30 to 45 min. Doing a test fit should be easy enough. If it doesn't fit, then an hour to put back together. I don't think a couple hours on a Sat. morning would kill your riding season. I only have a 96 to 99 900RR so can't compare the R/R procedure. Good luck and keep us posted.

 

I understand Rem 1859 would prefer to get the information from the forum if he can, to avoid unmounting everything and possibly notice they do not fit in the end and then have to come back to his original situation , after a few hours of work , when some who really know those motorbikes really well would be able to tell him the answer in the wink of an eye ! Lol

Here is the topic ( which w as about muffler compatibility and mouting a 829 or 854 one , for example on a a 93 header if i remember well ) .that i had quoted the post from , although the first sentence was missing in what i quoted, so i included it here this time :
https://cbrforum.com/forum/cbr-900rr...ibility-30911/

the whole post answering the question is that :

" the 929 or 954 wont work due to the mid pipe. If you change the entire exhaust no problem, but if you just want to change the can, it's the bolt pattern that's the problem.

The 93-95s are the same, 96-99s are the same. On the 93-95s if you look at the 3 bolts on the can they form a triangle, one bolt is at the top( I think). On the 96-99s one bolt is at the bottom. The bolt pattern is exactly the same just rotated 180 degrees. If you mount a later year can, the exhaust tip points in the wrong direction. You can get the mid pipe cut, rotated and re-welded then use the later cans.

You can always get a completely new mid pipe, which should come with the new slip on end with springs and use any new modern pipe you want, buit that's pricey. I just kept looking on EBAY until I found a carbon fiber yosh for my year (94), and it was $140 shipped if I recall. You can get aluminum ones for under $100."

 

From the infos i found on the internet , between what i saw on Honda parts numbers schematics ´ drawings and some informations i found on ebay , at least any 900 RR Full exhaust system from 1994 to 1997 , should be possible to install on any 900RR from 1994 to 1997 !
On the Honda parts numbers schematics' drawings , all 4 years Full exhaust system seem to look exqctly the same ( same shape ) and even the mufflers seem to have the same 3 bolts patterns , whereas on the " 900RR Exhaust compatibility " on this forum , someone had wrote , as i have quoted in my previous posts in this topic , that :
"The 93-95s are the same, 96-99s are the same. On the 93-95s if you look at the 3 bolts on the can they form a triangle, one bolt is at the top( I think). On the 96-99s one bolt is at the bottom. The bolt pattern is exactly the same just rotated 180 degrees. If you mount a later year can, the exhaust tip points in the wrong direction. "
But that is not what i see on the Honda parts numbers schematics' drawings , at least 1994 to 1997 included seem to have the same bolt pattern ( they do not seem rotated 180° there ! ) , unless the drawings do not reflect reality !
The parts numbers are similar but with a difference in the 3 letters in the middle ( while both sequence of numbers before and after tjose letters are the same ).

On ebay , i found the infos that 900RR full exhaust sytems are compatible from 1992 to 1999 included !
I have not checked on the Honda parts numbers schematics' drawings yet for the years 1992-1993 and 1999 but 1998 Full exhaust system does not look like the 1994-1997 ones , it has a different shape and the muffler is also different !
That said, maybe the distance between the 4 input pipes of the header are the same and that it is possible to install a 1998 one on any other year from 1992 to 1997 but i find it surprising seeing the different shapes of the headers SP4-1 from 1994 to 1997 included , compared to 1998 one !

https://www.bike-parts.fr/honda-moto...F__1900/2/3276

https://www.bike-parts.fr/honda-moto...88/F_19/2/3321

https://www.bike-parts.fr/honda-moto...F__1800/2/3336

 

Searching a solution to my engine sound changes since The Akrapocic full'exhaust system was installed , replacing the previous exhaust and i read in the topic 900rr exaust compatibility that :

the 929 or 954 wont work due to the mid pipe. If you change the entire exhaust no problem, but if you just want to change the can, it's the bolt pattern that's the problem.

"The 93-95s are the same, 96-99s are the same. On the 93-95s if you look at the 3 bolts on the can they form a triangle, one bolt is at the top( I think). On the 96-99s one bolt is at the bottom. The bolt pattern is exactly the same just rotated 180 degrees. If you mount a later year can, the exhaust tip points in the wrong direction. You can get the mid pipe cut, rotated and re-welded then use the later cans.

You can always get a completely new mid pipe, which should come with the new slip on end with springs and use any new modern pipe you want, buit that's pricey. I just kept looking on EBAY until I found a carbon fiber yosh for my year (94), and it was $140 shipped if I recall. You can get aluminum ones for under $100."

What does he mean when he says " you can get a complete new mid pipe with new slip on end with speings and use any modern pipe you want " ?

Cause knowing the original header/ collector / mid pipe is in one part on the original stock one and only the muffler was removeable , i don't see how it could be possible to replace the mid pipe one with one with springs , to be able to use some mufflers that are still manufactured and sold nowdays , for the later CBR 900 RR's !
so there must be something i dis not understand in what he wrote !

The only solution i think about is buying a whole system including header / collector and mid pipe , in one part or in several parts with some springs to attach them , that would be compatible with as many slip on mufflers as possible !

 

I do not think that the info is correct, looking at the diagrams there is not a mid pipe on the OEM exhaust.
Your Akra system might now have one so in theory you could then fit another end can! Not sure why you would want to as the Akra would be deemed as a high end and well designed complete exhaust system specifically made for the bike.