Join Date: May 2011
Location: New Hampshire
Posts: 11
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450 250 interchangeable parts
I was wondering how interchangeable the parts for 450's and 250's are. Specifically, are the fenders and gas tanks the same size?
I know the 450 is a little bigger, but is it that much different (cosmetically at least)?
I know the 450 is a little bigger, but is it that much different (cosmetically at least)?
1986 Honda Rebel 250
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Invicta
Midight Virago 920
Rebel
SilverWing
The 250 and the 450 are two completely different machines.
While they share a name and some strong family resemblance, that's about it.
For original equipment stuff about the only things that are direct bolt over and same wiring are the rear turn signals. The front signals for a 450 have running light OE and the 3590 does not. The turn signal lenses are 100 percent interchangeable.
That's about it!
The tanks mount differently. The 450 uses a vacuum petcock, the 250 a gravity feed.
The 250 petcock will thread in to the 450 tank.
The forks are different and the swing arms are different. Fenders will not be a straight bolt across.
While they share a name and some strong family resemblance, that's about it.
For original equipment stuff about the only things that are direct bolt over and same wiring are the rear turn signals. The front signals for a 450 have running light OE and the 3590 does not. The turn signal lenses are 100 percent interchangeable.
That's about it!
The tanks mount differently. The 450 uses a vacuum petcock, the 250 a gravity feed.
The 250 petcock will thread in to the 450 tank.
The forks are different and the swing arms are different. Fenders will not be a straight bolt across.
1987 CMX250C Rebel
2002 FSC600 SilverWing
1983 Yamaha Midnight Virago XV920MK
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Join Date: Oct 2010
Location: Norway
Posts: 1,727
Quote:
Originally Posted by Buickguy
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The tanks mount differently. The 450 uses a vacuum petcock, the 250 a gravity feed.
The 250 petcock will thread in to the 450 tank.
The 250 petcock will thread in to the 450 tank.
Any advice, tips or suggestions I make is my belief. So I take no responsibility if something goes wrong while someone is following them!
97 Honda Rebel CA125
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I should, but why would you want to?
1987 CMX250C Rebel
2002 FSC600 SilverWing
1983 Yamaha Midnight Virago XV920MK
Put your bike's year and size in your signature.
It helps others help you.
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Join Date: Mar 2011
Location: Virginia
Posts: 652
Quote:
Originally Posted by 88nightrider
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So then a 450 petcock will mount up to a 250 tank?
No, because cmx450 petcock needs vacuum port to allow fuel. as far as I know cmx250 doesnt have any such provision for a vacuum port
1986 Honda Rebel CMX450 'Chetak'
##Ramp to Interstate is bliss##
When riding you should have a proper Brains:[email protected] ratio. No one wants to ride with someone who is afraid of everything it is equally crappy to ride with someone who is afraid of nothing.
It would still mount to the tank, he never said it had to work... 
1987 CMX250C Rebel
2002 FSC600 SilverWing
1983 Yamaha Midnight Virago XV920MK
Put your bike's year and size in your signature.
It helps others help you.
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Join Date: Oct 2010
Location: Norway
Posts: 1,727
Quote:
Originally Posted by mohanpiyush
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No, because cmx450 petcock needs vacuum port to allow fuel. as far as I know cmx250 doesnt have any such provision for a vacuum port
Quote:
Originally Posted by Buickguy
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It would still mount to the tank, he never said it had to work...
Where does the vacuum port on the 450 get its vacuum? Through the intake port?
Any advice, tips or suggestions I make is my belief. So I take no responsibility if something goes wrong while someone is following them!
97 Honda Rebel CA125
Put your bike's year and size in your signature (<-- Link)
It helps others help you
It helps others help you
Black Lithium II
The problem I find with using a 250 petcock on a 450 isn't so much a matter of vacuum vs not, but rather fuel flow. The 250 petcock is 3/16" diameter. not much fuel needed for a single carb. The 450 is 5/16", needing double the fuel flow to feed two carbs and a larger appetite.
Ther are people that have successfully converted the 450 petcock to a gravity fed by blocking off the vacuum diaphram (solid plate) and plugging the line from the head. IIRC, it was recommended to do an overhaul of the whole thing to make sure there were no restrictions. YMMV
Ther are people that have successfully converted the 450 petcock to a gravity fed by blocking off the vacuum diaphram (solid plate) and plugging the line from the head. IIRC, it was recommended to do an overhaul of the whole thing to make sure there were no restrictions. YMMV
Comments contained in my posts are not intended to cause physical or psychological stress and are mearly my two cents worth, and in this economy, that's cheap!
Midnight Venture - Black Lithium II...
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Join Date: Mar 2017
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wondering if the turn signals wiring assembly in the 250 interchange???
Newbie
Join Date: Nov 2018
Location: East Tennessee
Posts: 5
needed new tank
Just joining the chat, but for me the "why" is because I am retrofitting a 250 tank for my 1986 450. I still need the 450 petcock though for proper fuel flow for the dual carburetors. My question is will the 450 petcock leak if put into a 250 tank without mods? (The original 450 tank has a plastic insert that the 250 one does NOT have and I am afraid of any leakage or vacuum loss)
(p.s. I am using a tank with an overflow that acts as a vacuum)
Thanks for any help
(p.s. I am using a tank with an overflow that acts as a vacuum)
Thanks for any help
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