i found unobtanium

[CasaJones]

It turns out that the engine I bought is off an 83 and it came with the carbs and airbox for only $100. I know I got lucky and before you offer...NO, I'm keeping 'em ;)

Here's my question. What all do I have to change out to make it all fit on an 82?  I have read several posts that talk about different front cylinder exhaust pipes. You don't have to change the exhaust unless you put different jets in the carbs or both or...???

Answer real slow and use simple terms that even I can understand.  This is my first rebuild ever and I don't wanna screw it up.:)

Thanks for the help y'all

CJ

[Rick G]

You can use the '82 exhaust pipes , you may have to rejet,tho The top rear engine mount will have to have some material cut away, to clear the rear carb. That's about it. Cross your fingers that the thing runs!~! ;) ;) ;) :D :D :D

[CasaJones]

What size jets do I re-jet to and do I only need to do the front or both?   

[Rick G]

Its not going to be very far off , Go with what's there and see how it runs.

[inanecathode]

I think you'll either need to get the 83 fuel tank, or switch to an 82 fuel pump.
I think....

[Rick G]

That too!

[h2olawyer]

Glad you got the airbox.  The 82 airbox bottom doesn't clear the 83 carbs.  Great snag!  That's less than I paid for cruddy 83 carbs.  They look great on the outside!

H₂O

[Coil Coyle]

I think you'll either need to get the 83 fuel tank, or switch to an 82 fuel pump.
I think....

Cathode,

Plugging the return fuel line to the petcock is a workable solution. The 83's just bleed back part of the gas flow to the tank as vapor lock prevention.
None of the CROV Bakersfield V's ever vapor lock so it's not really necessary, they ride some pretty hot days in The Valley.

$0.02
;)
Coil

[artbone]

I think you'll either need to get the 83 fuel tank, or switch to an 82 fuel pump.
I think....

Cathode,

Plugging the return fuel line to the petcock is a workable solution. The 83's just bleed back part of the gas flow to the tank as vapor lock prevention.
None of the CROV Bakersfield V's ever vapor lock so it's not really necessary, they ride some pretty hot days in The Valley.

$0.02
;)
Coil

How do they do that? My 83 has 2 fuel lines, 1 is the prime, the other is regular and reserve controlled by the vacuum switch. How does the gas get back to the tank?

Art

[Rick G]

Either you missed a hose or it has a '82 tank and petcock and the return hose is corked. "83 petcocks  are larger and have 2 diaphragms.

[supervision]

 art, so the one is prime and the other two are for normal, and reserve.  Ok and that means the prime is off in normal opperation

[CasaJones]

I have the unobtanium in the dip bucket now.  They were pretty gunked up.  One side went back in for another bath.  When I put it back together and on the bike I will most likely T back into the fuel line so it double filters a portion of it and helps prevent vapor lock. 

I did manage to break off the little plastic piece. :'(  I went to a hobby shop that has a lot of remote airplanes and got 2 pieces of 1/8 x 12" brass tubing.  They have plenty of it there.  (2 pieces come in the package)  I know I don't need that much.

[Brian Moffet]

art, so the one is prime and the other two are for normal, and reserve.  Ok and that means the prime is off in normal opperation

No, the one fuel line does both prime and reserve.  Sounds like Art is missing the return line connection which is off to the side.

[supervision]

 So Brian that means on normal, the bike runs on one line from the tank.

[QBS]

Here's the '83 deal, as they left the factory.

The fuel petcock is vacuum operated.  There a small vacuum line that goes onto a small spigot that sticks out to the right of the petcock as you are facing the left side of the bike.


There are two large spigots that stick out to the left side of the petcock.  The lower spigot provides all sources (Prime, Reserve, and the default On function) of outbound fuel headed for the inbound side of the fuel pump.  Fuel outbound from fuel pump goes to the carbs via a "T".  Unused fuel then returns to the tank from the back carb via the large upper spigot on the petcock.  I think there is some sort of fuel pressure regulator function involved somewhere in the midst of all this but I've never had the need to find out.

FYI:  A failed '83 petcock can leak  fuel out of both the outbound and inbound spigots.  If your carbs have bad needle valves (and whose don't) you will end up with gas on the ground.  For best results don't depend on either the vacuum controlled fuel cut off or your needle valves.  Install inline fuel cut off valves on both the outbound and inbound fuel lies and use them whenever the bikes is to be parked for more that a few ours.  Ask me how I discovered all this.