ciggy's are ####, never had one but i engineer them for a living at the moment

Try being here, its 2:10am and I've run out of cigarettes, not at all tired (I should be).


P.S. Bugger it I'm to buy ciggy's, back in 5.

Thats ok. Im on my 6th coffee in about 2 hours so I'm probably a little hyped up anyway. I just start to ramble.

ooops, i've started speed reading some posts, it doesn't seem to be paying off too well , i just end up saying stupid stuff

Yes. I think you aare referring to the vacuum advance on the dizzy. You simply remove the dizzy cap so you can see inside, remove the vacuum hose going from the carby to the dizzy (from the carby side) and suck on the hose - if working correctly this should move the vac advance plate inside the dizzy. when you stop the vacuum it should return to the original position. This part works ok.
ddgonzal is referring to the mechanical advance setup (weights and springs) that get thrown out under speed thus moving the plate and advancing the ignition, I think what he was getting at was that after they are getting thrown out and advancing they may be sticking and keeping the ignition advanced after backing off the throttle causing the ignition to remain advanced. I will have to look into it.
As for the carb , cheers just let us know how you go.

cant you test the advance by sticking your finger in one hole and blowing in the other or something (yes im still talking about cars )

either that or pull the hose off and drive it to see what diffrence that makes


btw, yeah ill grab ya a carb, if you dont want it in the end someone else will, i have bout five people wnating the 2 spare ones i got and i didnt even advertise

To / 1200rallycar,
By all means. If you happen to come across a decent one drop us an email and i could organise something with you. I should be able to organise the necessary adapter plate down here somewhere or even through mail order.

To/ ddgonzal,
Actually you raise a good point there that I may have over looked "the mechanical advance".
I take it what you are saying is that evrything runs fines maybe a couple of times or so under heavy acceleration but sometimes is not releasing from the advance position after I back off the throttle?
In theory this would make sense as to what happened the other day. As after a minute or so and a some light throttle applications it probably free'ed up and returned to its position thus the pinging stopped.
I did check this with the dizzy cap off in the usual manner turning rotor and ensuring it springs back ok but maybe it is sticking out on the road if driven hard.

The more i think about this i reckon i'm chasing two different problems
1) Vaccuum leak at manifold & throttle shafts causing the weird idle.
2) Possible the advance mechanism or something causing this pinging problem.

If 1200rallycar could source a good carb then i would go that way to start with as i dont really fancy spending any money doing the Hitachi.

Anyway I can prove this is the mech advance other than a dizzy rebuild?

Thanks.

im happy to grab you a carb and send it if you like, like i said shouldnt be more than $50 plus postage, there is a place that has em for $20 but i grabed both of the ones he had and have already sold em (at cost), 2 weeks ago

Buff, check the mechanical advance in the distributor, maybe the pivots are worn or springs are broken. If it sticks on the advance it could cause the ping. Also check the side-to-side play of the distributor shaft: there should be none whatsoever. You checked the vacuum advance diaphragm to make sure it doesn't leak, but does it move smoothly and spring back? If you have an electronic distributor the advance mechanism tends to have problems.

Or maybe the fuel/carb is dirty or has water droplets in it?

you are right there 1200rallycar, they should be easy enough to come acroos at the price you mentioned but unfortunately down here in Tas we are about 15 years behind everyone else. Most wreckers are very hard to deal with, have nothing and if you do manage to find what yoyr after they want top dollar. I found a couple of 32/36's that would have been ok - I was told $120 just for a carb! and the thing would have needed a full strip down and repair as well. These are the type of clowns I have to deal with down here.
Once upon a time i lived in NSW so I can appreciate the difference. Up there, there is plenty of competition down here no one seems to give a $#%##@%$#@
I need to find a good mail order place i think.
I fell much better now getting that off my chest.