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Helix engine carries a very small amount of oil which is more likely to make it very hot.
Helix engine suffer from a design flaw as the inlet rubber is under a lot of stress and usually breaks leading to running very lean.
Helix engine is said to be 21 hp (at least in Europe) maybe californian version were set already on the lean side ?
I had a Helix for 8 month and replaced it with a 250 GN for various reason, on the same ride to work I have an average 10% lower fuel consumption and I am 20 miles faster in the twisties since the (lame) handling is so much better than the Helix.
I think 9 hp is probably too much on the low side bearing in mind streamlining is a trade off between top speed (it helps) and low speed (it hurts with its weight) unless you have 12 speeds in the gearbox ...
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