I have only done around 6k on the 180cc, as I don't ride in the rains and do a lot of short journeys, the 180cc is restricted without the big valves and larger tb, the 165cc had a lot more pep at higher revs, the 180cc however has become very smooth and less vibey of late, but still needs these mods, hopefully in the next few months i'll do, along with a new exhaust. I already have the Simota air filter, though the air box is not modded, not sure if that is required. My bike was also not running for three months, one month for some mods and perpetually waiting for parts from Yamaha, one month for painting and a month diagnosing and repairing busted starter clutch and starter motor, i think most guys have gone through the starter clutch getting busted if running a cam without decompression (whether from Joel or anywhere else), however I've been running a different map from Joel, which seems to have less stress/kickback on cold starts, which I figure will put less stress on the starter clutch. One thing I do for the first start of the day, is put the bike in 6th gear push back until it locks and press start (after returning to neutral) I am currently working on having a custom made spark plug wire and cap from the US, I think this will eliminate some of the niggling issues I have been having with cold starts, though at the moment things are ok, the spark plug cap is pretty crap, I am on my 3rd, I had replaced 2 during the 2k kms i had ridden whilst the bike was stock.

I think I am reviving a dead thread. Its important that misconception has to be cleared out. I can see people are comparing cast liner block to an all aluminium block. Steel liner should have cross hatch (honing) marks to retain the oil in the cylinder, where as Diasil has silicon embedded particles which doesnot have honing marks as with the liner based block. You can clearly see there is no honing marks in the Diasil cylinder, hence the bore will be shiny compared to iron sleeve block.

No point in rehashing things out here. The bottom line is this:

The gentleman never provided the required support. He did not live up to the commitments made by him in terms of quality, performance & delivery of parts.

The inevitable reason that the cast iron cylinders is being compared with hypereutectic aluminum cylinders is because the gentleman was supplying big bore cylinder which was basically a bored out stock cylinder with a press fit cast iron liner. He made certain claims for this part being as reliable and long lasting as stock cylinders which inevitably did not live up to the claims due various reasons.

Don't get me wrong, I am aware of the pros and cons of both types of cylinders. It was a part of the learning experience. My personal experience with the gentleman's parts allowed me to learn a lot from the whole episode and I do not have any bitterness towards the whole thing.