Author Topic: Compatibility of early RM and PE expansion chambers - 250cc models  (Read 809 times)

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Offline James P

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Can anyone advise whether an RM250A, B and/or C model expansion chamber can be fitted to a PE250B, C or N model without modification to mounting points?

I am fairly certain that silencer mounting points are different, but always thought that the three mounting points for the main chamber portion (i.e. cylinder stub manifold, right-hand front frame lug and left-hand rear frame lug) were in the same relative positions for all these early RM and PE models.

Since I lack enough parts to try out the theory for myself, I am hoping someone has already investigated and can advise accordingly 8) .

Thanks & regards,
James

Offline suzuki27

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #1 on: March 19, 2018, 06:52:04 PM »
Some are same figment. I have an nos PE250C pipe which I fitted to my RM250B. The mounting points are the same. I sold the RM but still have the PE pipe

Offline brent j

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #2 on: March 20, 2018, 02:50:49 PM »
Some are same figment. I have an nos PE250C pipe which I fitted to my RM250B. The mounting points are the same. I sold the RM but still have the PE pipe

Out of interest, how much do you want for the PE pipe?

Thanks

Brent
The older I get, the faster I was

Offline James P

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #3 on: March 20, 2018, 05:04:08 PM »
Out of interest, how much do you want for the PE pipe?

Thanks

Brent

Doh! I was going to ask that - you beat me to it Brent! :-[

S27 - Thanks very much for the info...and can I please have second dibs on your now-almost-NOS PE250C pipe?? :D

Regards,
James

Offline suzuki27

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #4 on: March 21, 2018, 08:58:38 AM »
PM sent guys

Offline shelpi

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #5 on: March 21, 2018, 06:12:43 PM »
yes they fit I have A RM250B and a PE250B,C the only difference is the baffle in the chamber of the PE and spring location for the muffler

Offline James P

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #6 on: March 21, 2018, 06:30:06 PM »
PM sent guys

Thanks - replied.


yes they fit I have A RM250B and a PE250B,C the only difference is the baffle in the chamber of the PE and spring location for the muffler

Excellent - thanks for confirming what I thought I knew :) . Should it follow that pipes for all 77-79 PE250, 76-78.5 RM250 and 76-78 RM370/400 are physically interchangeable...?
If they fit, I'd be interested to hear from anyone who has tried an RM370 or 400 pipe on a PE250 (or even vice-versa for interest) - is there much/any obvious difference in the shape, length or volume (internal space, not loudness ;D )? Any observations on performance?


Thanks & regards,
James

Offline suzuki27

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #7 on: March 21, 2018, 08:09:07 PM »
I think the header diameter on the 370/400 will be too large to fit the 250 manifold.
I did try a PE250T chamber on my RM250T and it made it a little slower but seemed to give it more torque - better for mx on a rough track I thought. It is to do with the baffling and mellows the delivery

Offline James P

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Re: Compatibility of early RM and PE expansion chambers - 250cc models
« Reply #8 on: March 22, 2018, 03:40:00 PM »
I think the header diameter on the 370/400 will be too large to fit the 250 manifold.

Yes, you're right of course. I'd forgotten that the RM370 used a different exhaust stub manifold on the cylinder.

Regards,
James