you didn't happen to fill your tank with diesel before hand did you this is a bit of a different dilema that I am used to

but if it was the valve train he wouldnt have spark

just take to it with a big hammer,that will fix it lol. i suspect its ur cam or timming gear easy thing to check is to take dizzy out inspect gear on end possible look down the hole and turn engine over see if cam rotates(u'll need a torch)

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Snapped timing chain?

All over the place and backfiring like you wouldn't believe!
head has been off and all seems ok!
I'm seriously thinking about turfing this motor and putting something else in there!!! Gettin seriously pissed off with it!!

Hmmm when u say bag of #### lol, does it seam to run like engine should( just really badly) or all over the shot like its just a bunch of explosions that by fluke turn engine over. my only ideas from hear are to remove valve cover and turn engine over by hand and make sure valve train is doin wat it should.

if it was compression i would still think it shoud kick and possible run thats my thoughs anyway.

blown head gasket? any coolant in the oil or oil in the coolant?
Try a compression test
if possible have someone turn the engine over while you check ignition timing
either compression, timing or carb issue though

There is plenty of spark and fuel going to the right places! When fuel put directly into carby, will run like a bag of #### for about 2 seconds then dies and won't fire again! Did this with all 3 carbys!

curtis.. , jinx!

Are you getting spark to the spark plugs? Take a lead off and hold to engine block while cranking to see if there is a spark.

If not there could be a problem with the ingition circuit, eg a broken ballast resistor.

Is fuel going into the carby? When you remove fuel line and crank does fuel squirt out (might be goo idea to put the hose in a bottle so fuel doesnt go everywhere).

Can you get the engine to fire at all if you squirt a bit of fuel into the carby?

Fuel, air, spark. You need all three for the engine to fire and one is not present. Try and work out which it is and then work out why.