Mighty Boy restoration - HELP NEEDED PLEASE!!!

[bazeng]

Hi Guys,

I've been reading this forum for a while.
I love the Mighty boys and managed to get one a year ago.

It has been fully resprayed, the engine has been rebuilt (800cc), gearbox freshened up and interior updated.

I've got some nice wheels on it and its started to look good.

The issues I have at the moment are:

- Carby vac connections
- Some broken wires when it was purchased, not sure where they go
- Missing dip stick

Now I've gone through all those pdf files which had the carby diagrams etc, I've also looked at the engine diagrams and tried looking at photos but cannot find anything clear enough to follow.

If anybody is in VIC / MELD / SE suburbs who has a 800cc mighty boy who I can check out and just confirm some wires etc it'll be appreciated.

If not, I'd like to take some pictures of what I need and if somebody can help identify them it would also be appreciated.

Unless somebody has a document for all the vac connections aswell as linkage connections on the carby, I could look through them and try and sort it out.

Thanks guys.

[Brayden]

I'd be happy to assist with the missing/broken wires and vacuum hoses if you can provide pics. I'm in the process of fitting a rebuilt motor to one of my utes, so I'll take pics of the vacuum connections for anyone who needs them.

[bazeng]

I have some pictures for you.

Let me know if you can complete the puzzle!!

Below are photos of what is required

CAR:


ENGINE BAY:


Missing Wires:
Yellow and red wire - ??? broken when purchased - Does this go under the gearbox? reverse sensor?


Single wire with round connector - one end broken already... On both sides of car (behind headlight).. not indicator.


Connector next to firewall - drivers side up near the carby.. what is this for?


Charcoal Cannister - vac tubes?? I believe they go to the Carby and the fuel tank... please confirm (bottom fuel tank?, top to the carby vac??)


Carby linkages - I believe something may be missing.. Only the primaries are working.. the secondary is connected via the choke... I dont think this is right...

[jeff]

Howdy and welcome, your on the right track with your wirihg yes Yellow Red wire goes to the reverse switch on gearbox, red wires behind H/lights are part of indicater/ parking light circuit but are excess to needs(just tape them to harness so they are safe) ,BlackwWhite is second /spare carburetter solenoid connection this is active (+) , hope this helps . Canister or linkages I cant help you with .Good looking BOY, cheers.

[bazeng]

Thanks for that!

In that case, anybody have a solenoid lying around? Also the reverse switch, anybody have one of those? I believe my one has the wires broken in the body... I have to crawl under to confirm.

Now, for the carby stuff... (I'm an EFI guy... this carby stuff is new to me!!) Can anybody help?

[Brayden]

Carby:

For starters, your throttle and choke cables need to be swapped over. The top linkage is the choke, and the bottom is the throttle (primary butterfly). The secondary butterfly is vacuum operated by the pot on the front of the carby (right side of your picture). To check correct operation, open the primary to 3/4 and then manually open the secondary. If it is stuck then your carby needs an overhaul, and the diaphragm in the vacuum pot is probably shot. In case the vaccum line to the pot has been disconnected, it should be hooked up to a nipple on the front of the carby about 3cm to the right.
Personally I think the vacuum operated secondary is a really poor design, and making a manual linkage is a far better option.

The rest of the vacuum lines (between 5 and 10 depending on year model and transmission) are difficult to explain, so I'll take some photos to describe the configuration.

[bazeng]

That would be great Brayden.
I'll take photo's of all the nipples that are free on the engine.

As for tuning the carby for the first start, any tips? Also any tips in priming the fuel system or just crank till it starts?

[Brayden]

No need to prime it, just spray some Wynns "start ya bastard" down the carby throat till she starts. Carby only has an idle adjustment on the rear, so nothing to worry about there.

[bazeng]

Is anybody able to confirm the colours of the wires going to the starter motor? Just to be safe.

I'm pretty sure I have connected it the way it came off but I'd like to confirm before I connect the Battery.

Also the wire that comes off the loom that attaches the the engine earth.

Thanks.

[Brayden]

There should be a wire off the loom that earths on the bulkhead above the coil. There is no loom to engine earth that I can recall. Wiring to the starter can only go one way as the terminals are sized. Main power lead runs straight to the battery.

[bazeng]

The thing is with this mighty boy, the wires / plugs have been changed. I believe due to the age, the old connectors may have broken off in the past.

So now I have the generic connectors on the ends of the wires. From memory, is the battery power cable (main power) white in colour?

I have one wire from the loom going to the engine as an earth.. colour is black / blue.

The wire going to the starter motor is black / yellow. And the +ve feed from the starter is going straight to the battery.

What is the black and red wire? its running in parrallel with the starter motor wires.

[bazeng]

Also, Jeff

Is that carby solenoid required?

[jeff]

No, not if the carbi your running doesnt require it , original factory (85 model) setup had 2 connectors and only 1 fuel cut solenoid , but both run power from ignition on same circuit . The side view picture (from previous post) , I believe that in the top left hand corner that is a solenoid of some sort likely connected at the other connection on the harness , but I,m just assuming here. cheers

[bazeng]

brayden,

I have 1 vac nipple on the back of the carby. I'm guessing it goes to the canister? what do you think?

Also I have one loose wire at on the firewall loom right behind the carby. One of the plugs connect to the carby, the other braching off is loose. It has been reterminated by the previous owner. I have a feeling it used to be plugged into a sensor in the block. Sort of like a knock sensor but I dont think there is such a thing with these cars. Any idea?

Also can you confirm the starter motor wire colours as the terminals have been reterminated by the previous owner.

- BLACK / BLACKYELLOW to starter motor trigger
- BLACK / BLUE to earth / engine
- BLACK / RED - UNKNOWN??

Can anybody confirm?
I want to get it fired up this weekend.

Thanks guys!

[bazeng]

OK, I tried to fire her up tonight. No luck.

It cranks, I have oil pressure, etc.

I will need to fill up the tank and also check timing. I think I may have the dizzy off timing. It sparks but spark is also quite weak.

I found out what connects to that wire behind the carby. It actually branched off the water temp sensor, but I believe its the oil pressure sensor. The guy who built the motor forgot to reinstall it so when I cranked her over, it pissed out oil at the back of the block. I couldn't find any bolt that blocked it off so I had a spare Galant VR4 oil pressure sensor so I blocked it off with that. I've gotta call the guy who built it to get the sensor & dipstick off them.

Thanks for the help again guys.
It's slowly getting there!