Put the stater and roter up for sale on here. People are regulary looking for factory rotors to rewind.
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78 XS650e build
- Thread starter Zmccleary7
- Start date
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
There's two different sizes far as the screw spacing goes , so it's not one size fits all like the advert suggests. There might be something in Tech that spells out the sizes... not sure. 
Vacuum taps are all one size. Manual taps have closer spacing. I can get you the numbers, but not just now.There's two different sizes far as the screw spacing goes , so it's not one size fits all like the advert suggests. There might be something in Tech that spells out the sizes... not sure.
The year model of the tank can tell you.
As example, the XS1100 standard has vacuum fuel taps. The Special has manual. The closer bolt spacing applies to the Special.
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
I went through the tech manuals and did some searching on various oem part finders and I found the petcock assemblies(2F0-24500). With a few google search's it seems the OEM versions (from78-84) had 46mm spacing and were vacuum operated compared to manual.
It would seem then the aftermarket set from amotopart would work.
Are you replacing vacuum taps?
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
yes I will be, The previous PO's left me with a rust filled mess in the tank and at some point their were BB's added to the tank that lodged their way into the petcocks. So currently we have the tank sitting in the por-15 solution before starting the sealant process here soon. Ill need new petcocks to eliminate first the BB's and also the rust I'm sure made its way through.
46 mm is the correct bolt spacing for the vacuum taps.
The aftermarket manual replacement taps I have on hand are 42 mm spacing.
The aftermarket manual replacement taps I have on hand are 42 mm spacing.
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
you are a godsend my friend!!!
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
hey! hey! those looks sick. thank ya boss
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
A few weeks have passed and I've run into a issue. The two holes that are used to screw the petcocks down are stripped(specifically both left hand ones. I've attempted everything from lock-tight to using a slightly larger imperial screw and nothing seems to be sitting. Would it be advisable to tap the holes for a M7 screw or just buy a new tank.
If there is enough meat in the fuel tap mounting boss and tank boss I suggest using M8, if not enough margin in the faces go for M7.
Second to last resort solder a plate over the holes and run one tap.
Last resort new tank.
Second to last resort solder a plate over the holes and run one tap.
Last resort new tank.
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
For the one tap would I just use a T or Y splitter from the outlet leading to both carbs? This won’t create an issue of any kind?(besides a bit of fuel sitting in the left side when I re-fuel?)
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
With a bit of research I found this thread: https://www.xs650.com/threads/petcock-and-fuel-line-routing.64786/
unfortunately it seems the OP's stopped posting so I'm unsure if it ended up working for them. The idea of running two lines rom one petcock sounds like a goo solution; come retaping doesn't work, Any thoughts or opinions? the OP's mentioned completely removing the main air jet but again they stopped posting so I'm unsure how it worked or was affected.
unfortunately it seems the OP's stopped posting so I'm unsure if it ended up working for them. The idea of running two lines rom one petcock sounds like a goo solution; come retaping doesn't work, Any thoughts or opinions? the OP's mentioned completely removing the main air jet but again they stopped posting so I'm unsure how it worked or was affected.
Helicoil?
Zmccleary7
"Not all those who wonder are lost" J.R.R Tolkien
From what I've seen the carb specs quoted are same or close to what most of the VM34 gurus recommend in terms of jetting, slides, et al. And yes, all also recommend removing the main air jet in an XS650 application. The rationale I have heard for this is that these carbs were originally focused on 2-stroke applications and 4-strokes run better without the main air jet. No doubt there is a deeper tech explanation but I don't know it.
It's called a "tang." After you get the helicoil properly situated, you break the tang off. Helicoils were designed with exactly your situation in mind.
I believer those are 6mm fasteners, no?
https://www.amazon.com/BILITOOLS-M6...8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1
far to pricey for a hunk of metal on mikes
