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And I do that from the bottom end right? Not the head? I only ask because I'm not sure I would fit a drill in where the head of the screw is.

Hey guys me again, got a screw holding something on to the frame I'm having a bit of trouble getting off, WD40'd it and have tried the obvious screwdriver, then tried vise grips on the screw head. No luck unfortunately. Any other suggestions?

All the jets are clear and look surprisingly clean inside. There was remnants of fuel inside the carby when I pulled it apart which considering it hasn't been started in years, that's a good sign for carby health to me. Dad's got an air comp and gun so will still give all of them a blow out...

Managed to clean most of it off. This is what I found. Make sense to you? I think 20 is standard yeah?

Ahh yep, excellent photos mate. Can certainly see how it would work. And yes I imagine just the shock alone could help to break most rust seals. As per your advice, just went out and pulled carby apart after watching a few videos. Fairly clean on the inside, only one of the needles was blocked...

Ah yeah I follow, wouldn't have expected something like that to work but will give it a try. Obviously I don't want to whack it too hard though yeah?

Will try the gas torch to remove the stud. If you could ask him that'd be great mate. Hmm think I musunderstand you. With the punch your talking about making a clean groove in the screw heads that I can use a flat to undo. How does tapping the head flat help?

Sadly, no welder or oxy set. Might try an easy out as timeeh suggested. Haha no punch either but that's easy enough to buy at Bunnings. Yeah the number would be great. Know any shops around Adelaide that I might be able to get a quote for the motor rebuild from?

The original electrics were also disconnected as well and half the wires ripped out. Unsure whether I'm going to restore the electrics or not. Not going to be a road bike, just for paddocks.

Conrod? Yeah we intend to rebuild the bottom end as well. Your quite correct in saying it's seen better days. The only thing keeping this bike alive is the wifes nostalgia. Bit of a side view so you can see some of the crap. This is after a lot of scrubbing away.

1983 Yamaha DT80 Enduro Part 1: Rebuilding / Cleaning a Carburetor - YouTube That a fairly accurate video of rebuilding carby?

Ah ha, didn't realise you were signing your name Craig, ironically my name is Craig too. Thus the confusion lol.

Ok guys, popped out and took a few photos. Also another thing, all the case screws are stuck and will strip the head pretty quickly. Any suggestions? No thread. Stud remover? On the piston, the scratch marks are from me. You can clearly see the chip in it. All the side looks clean, the inside...

Yes there is a small bit of stud still hanging out. Have tried prying it out with vise grips and a lot of WD-40 but no luck. Unsure of the best way to get it out now. By $200 for everything you mean purely parts I assume? Know any good SA shops I can find the stuff from or is it best just going...

Hmm, looks like they will both be useful sites in my search for parts. So what are bike motors like on the inside? Fairly tech minded but no experience with motors. I've had some people tell me that if I label every item and document the stripping of the motor then I should have no problems...

I pulled the head off but put back on as I haven't the parts to fix yet. Got no idea where I can find another stud lol. As you said earlier, parts are hard to find. Most of the ones on eBay I found are shipped from USA.

I know for a fact piston rings are shot. Sorry for the poor description. Bike has been sitting in a shed for many years. As such there is excessive buildup of dirt and general crap. Basically I think it needs a full rebuild. Top to bottom. http://i.imgur.com/PXbwMt2.jpg...

Also forgot to mention, as it was her childhood toy, wife very much prefers to keep it original so replacing the motor is a last ditch option.

Not sure if I got the right area or not, apologies if I haven't. Wife finally convinced her parents to give us her old bike from when she was a kid. It's an old 1974 Yamaha GT80. Not running. Know there's a piston issue and one of the bolts holding the carby (I think{it's the part over the...