Just more info.
One year, Hurley rode the Australian Castrol 6 hour race with a couple of Australians, and, the bike had to be "stock". With stock, that means the oil tank filler as well. So, that means get off the bike, open the seat, unscrew the tank filler, pour the oil in, reverse the process, half a lap in the pits filling, oil tank is OK again.
The simple fix is what we did, fit an S series oil pump, with the H2 wheel. The bike went the complete race on just at 7/8ths tank of oil, NO PREMIX. No performance issues.
On the H1 pump, the guts are just about the same as an H2, and the cams and ramps are interchangeable with each other, so H2 parts fit inside the H1 bodies, and vice-versa. It might also be a prudent thing to go to the Resources Pages and look at the H series oil pump end cap bulletin on the crush on the end cap sealing ring, and output revisions. Are these pumps the revised ones, or early ones? NOT hard to machine an early longer end cap to the revised distance, and that should be done if the pump doesn't have the later end dimensions. This is simply to put more crush on the sealing ring, so the pump doesn't leak, nor ingest air for the one cylinder oil line.
If the H1 pump is used on the H2 as is, I'd suggest setting it a bit richer than the last dot, and working it down as you go, SLOWLY.
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