First things first, the kits arrived and credit must go to TYGA as everything was perfect.
When fitting the kit I did run into some problems. These were quite easy to fix though. As I was fitting the kit to an MC18, the power valve cables for the top cylinder were a little too long and needed some interesting routing before they cleared everything. I also found that neither plug leads would reach, so new leads had to be made. A new radiator lower mount also had to be made as the stock MC18 one wouldn't fit the 300 barrels. The biggest pain though was fitting the pipes. Quite why I struggled I don't know, but TYGA use angled exhaust stubs which did take quite a bit of time to line up allowing the pipes to slide on and off easily.
Once everything was set up and ready to run, the bike started quite easily and ran well while I was breaking it in. This is when my disaster happened. After a couple of plug chops my power jet blocked and said goodnight to my lower cylinder. I was a little more than annoyed! TYGA sent me a full HRC jet kit, new pistons, and gaskets. In this time I sent the barrel to Langcourt who replated it and got it back to me within a week.
Today I managed to rebuild it and ran it all in. I spent a few hours this afternoon on the dyno and came up with some interesting results.
While it didn't quite make the peak power I was hoping for, it did make over 20% more power around the7,000rpm to 8000rpm range, coming down to a 10% gain above that. It did manage however to make 69bhp on the final run with a little more work still needed. The first run was made with 205 mains which are now 210, using the HRC BB needles. The bike pulls clean right from 3000rpm and makes peak power at around 10750rpm.
The one interesting thing is out of the two engines... I like the 250 better!