chandlerman wrote:
If you can do it, try to get your port timing up to 124TD/172ED. That'd match a Polini 177. You'll probably find that's not possible without altering the ports in the cylinder. I have some blown up DR's on the shelf. I'll get some measurements and see what they might look like by default.
You'll also want to cut the bar out of the reed cage and possibly widen it. Then, blend/flow all the channels. Carb to airbox, airbox to reed block, reed block to case, cylinder ports to case. This would be the time to open it all up, too, especially the ports on the DR.
You're already into my Porting 101 thread, which covers a lot of this.
Once you have your port timings sorted and everything flowed, then you can worry about squish. I've always found that squish on the DR by default is in the neighborhood of 2.5mm by default, so be prepared either have the cylinder or head milled down, or spend some quality time lapping the head.
You're using the stock ignition, right? You'll need to adjust timing to 18 degrees BTDC, too.
Good luck!
I'm using the stock ignition for now, I cleaned up the intake path, opened it up so all the pieces flow together better, cut out the center support in the deadlock and put in Boyesen reeds. The reeds seem really stiff, but I did leave out the metal support since Boyesen says it's not needed. I would say my squish is in that 2.54 area where I measured it. I don't know what the head looks like yet, thinking of going out and taking a look and getting a few pictures of what I've got.