Forgot to add that you should also clean the filter in the carb - very easy, unscrew inlet to pull out strainer...

I would suggest that the Fuel Filter(s) are all cleaned prior 1st flight (while you're waiting for the LaaLaa paperwork) to get debris from the initial enigne runs, and then again after the 5-10hrs test phase (while you're waiting for more LaaLaa paperwork!).  In this second stage, in fact a 50hr check Oil+Filter change etc. might also be a good idea.
 
Andy

Quote:
Ummm, an interesting "economy".  I'd be interested in others' comments, but the thought of what is in that oil filter, and able to leak back after shutdown, on a new engine would worry me?  What was the rationale for changing the oil and not filter (which holds a fair amount of old / dirty oil)?  Furthermore, an integral part of any Oil Change is to inspect the filter for metal filings.  The screen is fairly academic - if you find anything in there you've got REAL problems  
 
Just my 2ps worth...
 
Andy

Hi all,
 
Andy - rationale was I did not have a filter to hand... She is getting a full change at 25 hours as per the book. My filter has the non return thing (its the 48108-1). She was also bench run by Jade Air before delivery and I replaced that filter just before first flight. If the filter does its job, then at 25 hours I should have a good sample and therefore a good idea of how good the engine has been.
 
John - I tried to adjust the idle mixture as she has no pick up at all. I turned it out by 3.5 turns in the end and had no change (other than a smell of richness from the exhaust). So I turned it in 0.5 turns from where it was and she ran very rough - so I put it back where it was and everything was fine again. Currently I have a very big mismatch in CHT/EGT between the front cylinders and rear ones. Number 2 is running at 280-320CHT and 1150-1300EGT whilst number 4 is running at 350-380CHT and 1300-1450EGT. I am hoping that putting in a blocker on number 2 will raise the CHT and EGT - but not sure if that is true?
 
It seems my main issue was caused by dirty plugs, but I am suspicious of why the plugs were dirty and suspect the imbalance of temperatures that make it hard to lean are also causing roughness due to imbalance of efficiency.
 
She ran to the IOW quite nicely on Sunday. Almost infringed the Solent CTA - was saved by the Aware GPS beeping at me (blasting along at 4000ft, I forgot that the CTA goes down to 2000 halfway across the IOW - not used to this concept of going high).
 

Didn’t have much on at the weekend so I thought I would pull the gascolator to find if I have any debris in it after 12 hours.
It took me an hour or so and didn’t find anything at all... clean as the preverbal whistle.  
 
I did think afterwards "well that was a waste of time" but in actual fact it’s not.   I now know there is nothing there I didn’t before, so time well spent.