I have only had about 6 runns with my new venture 30 and just yesterday I managed to get the heli to take off straight up and not wonder with no stick input, having not flown helis before and also just starting to fly planes last year I thaught I did well to trim the heli myself. However just as I landed the threaded rod through the muffler broke probably because of the metal expanding, and as I heard someone else say "boy it was loud." I gave everything a check later and the tape holding the gyro started to unstick too, needless to say all this is not good. So I wanted to know what sort of things should I check for example when to check bearings and when to replace them, stress points on the frame, belts, what to look for where to look and how to know if its working.

Thanks

I think you'll be happy w/ your venture as it is a nice and solid heli (mind you it is a bit heavier than other 30 size helis but ...) Get into a habbit of checking your heli over before each flight or at least before you start the day's flying. Keep an eye on the tail boom and the support. It has a tendency to loosen up so it woudnt hurt to put that allen wrench on the bolts and see if they're still tight. Also while your at it, check the belt tension as well. One other thing that you'll notice is that ocassionally the blades will go out of track. They will defenetly go out of track if you let a folded blade drop and hang unsuported. That puts a lot of stress on the swashplate linkages and almost always will cause the blades to go out of track (I had that happen on my venture a few times, so now I am really careful when I go to extend the blades)
You asked about bearings. I replaced my bearings each time I crashed ... which was twice so far. All I did there was take the whole heli apart and check everything and most of the time, if you bent your main shaft, your bearings are gone too. Providing you dont crash, your bearings should last for a long time. I think i have about 7 gallons on this ship and the bearings are still good. How do I know that ? Well I know how this heli is supposed to sound in flight but also, spin your blades and listen for noises. It should spin freely and quietly.
Keep in mind you have a lot of moving parts in there so do keep an eye on everything. Things will start to come loose from vibration and stress but if you keep ahead of the game you'll have no problems. This is what I do and so far it served me well. Hope it helps.

First thing that wears down quick is the tubing inside the tank(s)
Muffler bolts cracking is something I never heard before. I'm using a gasket though so it maybe different if you don't use a gasket.
Many parts have only limited life. e.g. glow plug, wooden blades, bearings, croc connector on glowplug.
Most bearings will last at least a few hundred flights, assuming you greased them before assembly. Without grease, esp the high speed bearings in the engine area will break down quick. The engine rear bearing is also wearing out quick, depending on the engine and other factors. Sometimes it lasts only 60 flights.
If your machine has a vibration problem, all parts will suffer.

Good points there! I never had an engine fall apart yet so I cannot comment on how long it will last. Also keep an eye on the receiver. Check that all servo plugs are in tight and that the crystal is seated all the way in. I have rubber bands holding those things in so that was never a problem for me but I did hear of crystals coming out. Also keep an eye on the servos. I find that the servo screws need retightening every so often.
Btw. W.Pasman is totally right. The tubing inside the tank is a problem. I'd replace it just to be sure you won't run into problems later on.

That to both for the info, did give me some reassurance about some matters, and like you said the heli does seem to be heavier than most other helis.
I have since getting the model checked the bolts regularly after flights and sometimes I'm glad I did, and fixed a gyro vibration soon after testing. The tracking of the blades, must they be presice or is there room for a little.

well thanks for the help. and now that my muffler is back together Its flying again tomorrow.

The blades need to be in track as close as possible. It will fly better if they are.

I spend about an hour checking over my heli after each day at the field. I have 3 times found issues that would likely have failed in flight and caused a crash. I just check each screw I can get to and make sure everything feels right. I have also found that my gyro tape, the Futaba stuff, only last about 15 flights. I am trying a new brand now and we'll see how it works out.

Fine tuning a heli is a series of steps taken to eliminate as much vibration as you can and tweaking needle tuning, pitch and throttle curves.

Start by working on the blades, make sure they are balanced both for weight and that the cg's are matched. Try to get the tracking perfect. Measure the fly bar to make sure the paddles are as close to perfectly equi-distant from the head, make sure they are perfectly level with each other and level to the head.

Sizing ball links, eliminiating any drag on the tail rotor linkage, I could go on and on.

Its kind of like rough shaping a piece of balsa with 80 grit and working your way closer to perfect with finer and finer grits till its silky smooth.