Topic: kerker exhaust question

[KRONUS0100]

750 owners.............if a kerker 4 into 1 is properly fitted to the head..........all the bolt flanges should be equal distance from front face of head right?  took this off my disaster of a 72 motor and put it on the new 78F3 motor, and 1-3 fitt well, number seems to stick out 1/4" further.  yet when i tap it with a long heavy screwdriver and rubber mallett against the flange, i get same heavy thud as i get from other 3.

also, what is recommended gap between oil pan and top of collector?  seems like mine likes to sit at roughly 1/4" clearance.   

thanks.................... i know this shouldnt be this hard to install   and it seeems all was same and ok when on the 72 motor

[ccmclane]

Do all of the exhaust ports have the copper gaskets in them?  My first thought was that #4 has one while the others don't.  I didn't know that I had to replace the gaskets whenever removing my Kerkers until recently which is why this came to mind.

[KRONUS0100]

yep gaskets in place, getting ready to go out and pull the whole system back off the bike.

[flybox1]

I think what ccmclane was thinking is that there might be extra crush gaskets on 1, 2 & 3, and none on 4, giving you the extra space on 4.  when i installed a new kerker on my K1 motor,  I had to dig out 2 copper washers from each ex port.  check for extra hidden ones

[Stev-o]

I think what ccmclane was thinking is that there might be extra crush gaskets on 1, 2 & 3, and none on 4, giving you the extra space on 4. H

+1. I'll be installing a Kerker on my K5 this weekend.

[karnage]

Think its pretty typical of headers.My yosh header did that and my new brocks did the same but they sealed so I didnt worry about it.

[KRONUS0100]

welll header is off and found the culprit.  i have a very small ridge out near edge of the #4 port the header was hanging up on.  will make sure to seat #4 pipe before the rest when i go to put it back on.  in meantime i think i can get a wee bit of sand paper on a pencil in there an smooth it down.  interesting i didnt notice it before.