[FR]

Anybody have a good source for replacement exhaust flanges for a CB450? The original flanges are just too stupid to put back on the bike. They must weigh a 1/4 lb. I can't imagine a good technical reason to use them, they're some sort of pig iron, they must act as a heat sink, and they look like dookie. Am I missing something? Did Soichiro have a good reason to use these, besides mass production economics?

FR

 

[jbranson]

I've seen a lot of race bikes run without them, I replace them with alloy pieces machined from solid....real pain. The reason they are the way they are is to keep the exhaust valve seat area from getting too hot and the exhaust valve seat from dropping out of the head. Very important to keep the exhaust valve/seat/guide/area from getting too hot, they will wear very fast when over heated...or worse.

You'll often see copper o-ring gaskets for the exhaust....they use copper for it's great heat conducting properties.

That said....I've seen a lot of setups that don't use much of a heat sink for exhaust flanges. Can't comment on how it would hold up on a street bike....seen them both ways on race bikes and haven't really heard of frequent disasters associated with bikes that don't use them.....well except the odd melted head at Daytona now and then.
JohnnyB

 

[FR]

Hmmm. Forgot about the valve seats. I'll have to look at the head to see the proximity, I kind of think the exhaust port on that head is pretty long...plus the head is so massive, with big bridges connecting the huge cam castings. Can't imagine they need more heat sink...


BTW, JohnnyB, d'ju get my email 'bout the 106? The one in which I expressed some interest in taking it off'n your hands??


FR



Edited by - FR on Nov 21 2005 5:30:09 PM

 

[jbranson]

FR....if you are frxt500 then yeah I did. I sent some photos of the bike...did you get them?
Bike is sitting here waiting
JohnnyB

 

[FR]

Yeah, dat's me. I did not get no photos... where'd you send 'em. I'm waiting to hear from the owner of the 106. (I'm "restoring" it for her, the "" marks indicate that she just wants it to look good, but she doesn't seem to have any dough, so I'm killing myself to save a bike from the scrap pile for the good of mankind I guess)
Anyway, after some diligent shopping around, I found some seals that seem to work for the forks, but one of the fork tubes is too pitted to seal...also friggin with the shocks, wiring, yada yada yada

FR

 

[jbranson]

Sent them to your yahoo address.

If you've got another I can resend them. The gist of the message was that the forks and shocks seem very usable. You can take the engine too...please.
Where'd you see my post on the 106 group?
JohnnyB

 

[FR]

Yes, what?
I didn't get them from yahoo, but I'm not exactly "ept" (as opposed to inept, which I am) on the yahoo group thing.
Try sending to [email protected] if you don't mind.
I saw your posts on the 106 group that you turned me on to. Unfortunatly, I haven't found most of the stuff that I still need. I think the motoversale dude disappeared.

Thanks,

FR

 

[jbranson]

Frank,
Resent the photos to the new address.

The bike will be nestled in the snow waiting for you

JohnnyB