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Discussion Starter · #21 ·
That Nimbus is a 650 motor, right? If it's not terribly difficult to do I might be tempted. My problem would be sourcing a manual tensioner, I don't see any on ebay and I think the Turbo 500 I have is automatic.


@SirFoxx I'm putting my 650 into a 500 Turbo frame. I think the 650s drop into a GL frame with modifed GL650 hangers but on mine I may be fabricating completely new hangers because I hate the stamped sheet metal ones. What are your engine hanger plans looking like? If you've caught Murray's attention I'm sure he's discussed it with you I'm just curious.
the 650's, cx or gl, will drop onto the 500 frames with a modified 500 stamped steel hanger. you cannot modify the gl hangers as they are cast.

there are 4 bolts that hold the hanger to the motor. I believe the lower set needs to get modified--you cut the collar that the bolts go through off the mount, get new collars and move them down like a 1/4" and reweld them. its a very simple process. the reason for doing this is because the upper part of the mount that bolts to the frame is very different between the 500's and the 650's.
 

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the 650's, cx or gl, will drop onto the 500 frames with a modified 500 stamped steel hanger. you cannot modify the gl hangers as they are cast.

there are 4 bolts that hold the hanger to the motor. I believe the lower set needs to get modified--you cut the collar that the bolts go through off the mount, get new collars and move them down like a 1/4" and reweld them. its a very simple process. the reason for doing this is because the upper part of the mount that bolts to the frame is very different between the 500's and the 650's.

I know all that stuff, I meant with your bike, I thought you had an older CX500 frame? I didn't know what CX500s that worked on ^
 

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Discussion Starter · #23 ·
I know all that stuff, I meant with your bike, I thought you had an older CX500 frame? I didn't know what CX500s that worked on ^
I do. '78 standard. first year babyyy!

im not well versed on every flavor of the 500's, but the modification of the stamped steel 500 hangar should work on any of the us derived cx500 bikes. I am not sure about the gl500's, cx500e's, or the turbo bikes. i do know that it will work on mine as murray used to offer the modification service, but since stopped, but gave me advice on what to do, as well as finding a video on how to do it.
 

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2021 Benelli Leoncino - 2017 CSC RX3 - 2017 SSR Buccaneer 250i - 1979 CX650 Street Scrambler
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Why can't you modify the cast hangers? They're just cast steel, not hardened or anything. They take a weld bead just fine.

Charles.
 

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Discussion Starter · #25 ·
Why can't you modify the cast hangers? They're just cast steel, not hardened or anything. They take a weld bead just fine.

Charles.
you're not supposed to weld to cast do to its porosity. You can braze to cast, though I wouldnt trust a brazed cast piece on something thats keeping the engine secured to the bike.
 

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Why can't you modify the cast hangers? They're just cast steel, not hardened or anything. They take a weld bead just fine.

Charles.

In my case? It's just a preference to have something more attractive. And welding any cast is not something most people can do at home; I'd say the average guy has a mig welder and knows how to melt metal just well enough. The GL500 hanger that's sheet metal was just the easiest solution I think.
 

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you're not supposed to weld to cast do to its porosity. You can braze to cast, though I wouldnt trust a brazed cast piece on something thats keeping the engine secured to the bike.

It's a bitch and it can work you in circles when you run into issues, but done properly I'd trust it if it's just the one bolt hole on the hanger, as is the process for the GL500 sheet metal hanger. In my Turbo frame I'd have to cut and weld across the entire hanger on both sides and I wouldn't mind trying but I don't know that I'd trust it. For the aggravation some plate steel and tubes was my plan, and I can make it look nicer (relative to my tastes of course)

And now I actually really want to try it but it's 20 degrees in my work area so f that lol
 

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Discussion Starter · #28 ·
It's a bitch and it can work you in circles when you run into issues, but done properly I'd trust it if it's just the one bolt hole on the hanger, as is the process for the GL500 sheet metal hanger. In my Turbo frame I'd have to cut and weld across the entire hanger on both sides and I wouldn't mind trying but I don't know that I'd trust it. For the aggravation some plate steel and tubes was my plan, and I can make it look nicer (relative to my tastes of course)

And now I actually really want to try it but it's 20 degrees in my work area so f that lol
its both lower bolt holes, not just the one. I'll post the video here shortly.

I have a diesel heater for when its get nipply if I need to work in the garage lol
 

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its both lower bolt holes, not just the one. I'll post the video here shortly.
I've watched the video on it a while back, I thought they only had to do the top left one, my mistake.
 

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He only specifies that one bolt out of alignment?
 

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Discussion Starter · #31 ·
I've watched the video on it a while back, I thought they only had to do the top left one, my mistake.
ill have to go back and watch it lol. all i remember is it needs to get modified (currently at work and cant view YT >.< )
 

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There's no need to modify the cast hanger. Both the GL500 and GL650 use a two-piece cast hanger with identical attachment to the frame. You can hang a 650 engine on a GL500 frame using a GL650 hanger.
The one-piece, stamped metal hangers are all CX500. I'm not sure about the CX650C.
 

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Discussion Starter · #33 ·
There's no need to modify the cast hanger. Both the GL500 and GL650 use a two-piece cast hanger with identical attachment to the frame. You can hang a 650 engine on a GL500 frame using a GL650 hanger.
The one-piece, stamped metal hangers are all CX500. I'm not sure about the CX650C.
We should compile this info somewhere on the motofaction site 🤔
 

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There's no need to modify the cast hanger. Both the GL500 and GL650 use a two-piece cast hanger with identical attachment to the frame. You can hang a 650 engine on a GL500 frame using a GL650 hanger.
The one-piece, stamped metal hangers are all CX500. I'm not sure about the CX650C.
Thats my problem, and I guess it was bad of me to jump into another's thread about it. I have a CX650C w/ cast hangers that are very different from the turbo hangers. I'm using a Turbo 500 frame; most don't. That might work for @SirFoxx

CXPhreak pointed me to the diagrams this morning; I was about to ask in the Turbo forum about the frames but this saved me from that post:

Line Font Auto part Parallel Engineering
 

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We should compile this info somewhere on the motofaction site 🤔
AFAIK, there's only one CX500 frame mount pattern across all years; I think Randall's talking about a GL500 frame which is different and doesn't require modifications. The Red Rocket was built welding a GL500 frame to a turbo rear I think, and I've seen at least one other instance of that.

For your CX500 frame I think you're stuck modifying an engine mount.
 

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Discussion Starter · #38 ·
AFAIK, there's only one CX500 frame mount pattern across all years; I think Randall's talking about a GL500 frame which is different and doesn't require modifications. The Red Rocket was built welding a GL500 frame to a turbo rear I think, and I've seen at least one other instance of that.

For your CX500 frame I think you're stuck modifying an engine mount.
i mean, thats fine with me. it doesnt seem that hard to do.
 

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-doesn"t the crankcase vent come out from the middle section of the motor, not from the back cover? what issue do you see with the venting?
Depending on the year of the engine the crankcase may be vented through the cylinder heads, CX500s, through the pulser cover, GL500 and others, and through a bottle breather at the timing inspection port.
 

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