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Here is a 1000 point Ork army list I wrote. Any criticism or comments?

HQ: Warboss
Power klaw, Kombi-Skorcha, Attack Squig, 'eavy Armour, Cybork Body.
120pts

Elites: Nobz Mob (3)
3x Warbikes, 3x Kombi-Skorchas, Power Klaw, 2x Big Choppa.
185pts

Troops: Nobz Mob(5)
4x Kombi-Skorcha, 3x Big Choppa, Power Klaw, 'eavy Armour, Painboy, Cybork Bodies.
Trukk w/ Wrekkin' Ball
240pts

'ard Boyz Mob (20)
17x Shoota, 2x Big Shoota, Nob w/ Power Klaw
245pts

F. Attack: Burna Bommer
4x Skorcha Missiles
165pts

Total: 1000pts

Eavy armor on nobs is fairly pointless and warboss would be better with mega armor (or with bike). Wrecking ball is also fairly useless, boardin plank is better.

You could also squeese in a waagh banner if you drop some upgrades on the warboss (cybork/attack squig and/or kombi scorcha)

running 'ard boyz other then in a trukk army is kinda pointless (as a cleanup squad, and even then its mostly better not to take them).
your army has too much variation. As I am sure most would say, you need to focus on one strategy, so either mobility or a green tide. this makes the 'ard boyz on foot in a weird.
It's generally better to just take more boyz instead of upgrading 1 squad into 'ard boyz
Since the rest of the army is mobile, you couldn and probably should go all out on the trukks (dropping the biker nobs and ardboyz for 3 trukk boyz, thats 36 more boyz. that are very mobile), or atleast downgrade the 'ard boyz into a 12man squad and load them in a trukk to give them the mobility to keep up with the rest of your army
This being said, your army already has very small numbers for an ork army at 1000 points, and you are trying to compete on having a "hard to kill" army while the rest of the armies with comparable number of models have 3+ and/or 2+ saves.
As for the flyer, it has been shown that the Dakkajet is by far the best one for the Orks.
Kombiskorchas while awesome have diminishing returns, so I would probably drop 2 from the trukker nobs

Imo never drop the attack squig. Cybork is pretty good too. And 'eavy armor nobs will keep them alive longer against bolter fire and in cc.

Dunno about the wrecking ball or ard boyz though. Could probably fit more bodies in your waaagh instead

If you make those 20 boyz regular boyz and not 'ard boyz, you'd only be about 10 points away from adding a battlewagon to put them in.

Or you could even make it a 30 boy blob with 3 big shootas and have a few extra points to toss around elsewhere.

Perhaps give da Boss a warbike as well?

Kombi Skorchas on a bike are very limited use ..
(on trukker nobz and Meganobz yea ..but on Biker Nobz ?? why )
Going with your list as is ..Reduce Ard Boyz to 12 total and load them in a trukk..barrel it down with the trukk Nobz..or Strip their armor and send them in a Wagon ..(scrounge points from missiles etc..

Not a big Fan of the Burna Bommer but it does work for exactly two rounds then you try to get it shot down so it splats in the enemies formation

biker nobs are just a nono for a few reasons. you only has 3, and dye kill 1 and ur runnin off the bored. they are better in mobs of 8+ with a biker boss and at 1850pts+
i would kill a few ards and there ardyness for normal boyz (shootas/SLUUGAS)
and the burna bomma....... the burna bomma.........
in theory its a fun unit but dakkajets are just sooosooo much better!
your saving a good bit of points try and throw in 5-10lootas in squads of 5 cus they are just so needed here!

Thank you for all your advice. Here is the amended 1000pt list, any further advice or changes?

HQ: Warboss
Power klaw, Kombi-Skorcha, Attack Squig, 'eavy Armour, Cybork Body.
120pts

Elites:
Nobz Mob (5)
5x Warbikes, Power Klaw, 4x Big Choppa.
270pts

Lootas Mob (5)
Mek w/ Kustom mega-blasta
75pts

Troops:
Nobz Mob(5)
4x Kombi-Skorcha, 3x Big Choppa, Power Klaw, 'eavy Armour, Painboy, Cybork Bodies.
Trukk w/ Wrekkin' Ball
240pts

Boyz Mob (20)
17x Shoota, 2x Big Shoota, Nob w/ Power Klaw
165pts

F. Attack:
Dakkajet
Ace pilot, extra supa shoota
130pts

Total: 1000pts

Way better imo. Personally I prefer looted tanks for transport...at least they can't get shot up by s4 shooting

Unless you're gonna be facing a decent amount of skimmers and/or flyers (which you may not very often at 1k games) drop the fighter ace as it'll be pointless, and frees up 10 points which could give you an extra wound in your boyz unit. Nobs in boys units seem a good idea, and can be some of the time, but if they get challenged, attacking on I1, they're not gonna last.

I think it could use more bikes

Hm. If so, ditch the 2nd nobs mob. Get more nob bikers and put the warboss on a bike as well!