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![Very Happy :D](./images/smilies/icon_biggrin.gif)
i too like jenning's book, i think it's a great read and not as difficult to take in as graham bell's book . but like you say, they were good for the 70's. there again, the most modern 2 stroke i've worked on was an 86 rg250 gamma engine, but after stripping the engine completely, apart from being watercooled, it wasn't much different from the gt250's i usually work on
![Very Happy :D](./images/smilies/icon_biggrin.gif)
modern 2 strokes are so complicated now [to me] and they've wandered too far away from the simple piston port 2 stroke of yore. i'll stick with the gt250's, they don't tax my brain too much
![Very Happy :D](./images/smilies/icon_biggrin.gif)
right, the gt350 i'm building. i had the heads milled out to 65mm diameter [supposedly], fitted a 0.5mm thick copper head gasket, annealed it and finished building it. result? absolutely impossible to kick over. after taking the heads off again and measuring them - should have done that first in hindsight - the left one was only 63mm diameter, so that needs addressing. after measuring the volume of the head minus the volume of the piston dome and doing the maths, it seems i've got 16:1 compression ratio, which is somewhat high
![Very Happy :D](./images/smilies/icon_biggrin.gif)
![Very Happy :D](./images/smilies/icon_biggrin.gif)
cheers, dd.