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Achievieng 95° inlet retard on a SOHC camshaft looks almost impossible (would need a lot of regrind on the exhaust) certainly more so on a milder cam engine (mine is 260 / 260).
On a twin cam engine on the other hand you can alter the phasing of the cam so it is principaly a matter of delaying inlet events.
The main issue is raising the compression ratio this much.
And obviously converting to EFI wich is not that big a deal on a single I presume.
I am still on the market for a DR 350 bottom end (extra stroke => more CR)
Unfortunately for me, I can never get hold of a complete DRZ 250 head since they are not sold in Europe as far as I can tell (did some searching but no luck so far).
DRZ 250 does have the twin cam setup I am looking for.
At least I now see some interest in the post, I was becoming to be a desperate ecomodder !
Let's agree on a short list :
We want a DOHC engine,
It needs to have some very hi comp piston available or to be able to be hybrided with a smaller bore setup,
It needs to be converted to EFI,
the bike needs to get a massive gear reduction.
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