Started as a 70mm 225 that was extended with extension welded to top of barrel, new alloy spigot welded into the barrel, then bored to suit 72mm piston. All of the above done by Paul Baker (lovely job) at SRP to my spec.
Loose base packer cut circular (by Steve Rowe) to my specification, transfers cut and shaped by me, along with porting by me.
The Casa casing mouth was cut to my spigot size, transfer feeds cut in by me.
AFR heavy cast head machined by me for spigot fit into bore. Squish profile and combustion chamber by me.
Once happy with the configuration the top end went off for ceramic plating with Wossner piston from AF.
Motor assembled with bits from CamLam, MB and Readspeed. Then dynoed by Readspeed.
Over a development period the bike went back to Readspeed a couple more times more, each time with different exhaust, ignitions (advanced/retard and/or static), 2nd head, carb swaps and different exhaust configurations. Jerome's dyno observations and expertise giving me food for though and a bike that I've been confident to rally on.
The gearing I've dialed in with real-world road miles, matching gearing to pipe delivery and Anthony Tambs AC tacho feedback (a huge help for appreciating how these factors influence one another).
Last big change, other than further exhaust swaps/tests, was taking the plunge and investing in an LTH clutch from Darrell Taylor, with his modified centre. This change was necessary as even the uprated 6-plate was struggling with the low RPM torque but, whilst I have never been able to justify the price of an LTH clutch before, I'm now an absolute convert and appreciate the class above any clutch that I've used before. Ok, there are plenty of other clutches over £450 that I've not tried, but there really is no comparison to any of the other 5, 6 or cassette clutches that I've used (and I've tried all sorts over the decades).
The motor is a personal project to deliver the performance that I'm looking for, at the RPM that I'm comfortable with. It only makes just over 28bhp but it rides beautifully, cruising at high speed and low RPM. In a world of Subarus mine is an old school V8; not a performer by today's standards but a tree stump puller.
My engine, to my spec, with the help of a lot of skilled people that have helped me to realise what I was looking to create (thanks and sorry to anyone I've overlooked).
I continue to try different configurations and the keep learning as i do so. The project teaches me about all sorts of 2-stroke issues that I've not really had to consider before (e.g. primary compression ratios, etc) so it's a project that keeps giving