Quote:
Originally Posted by Ironside
I took a quick look at JT sprockets website on your behalf, there is an 18 tooth front sprocket available which has the same fitting dimensions as the superhawk, catalogue number JTF 339. I can't say for sure if there will be enough clearance for the larger sprocket, JTS are very helpful it might be worth asking their advice.
Regards,
Ironside.
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If the 18 will fit without hitting the cases or the guides, I'd go with that.
16/41 is a 2.563
17/39 is a 2.294 or 11% less revs
18/39 is a 2.167 or 18% less revs
If you want more efficiency, than that, you'll have to re-jet and/or downsize the carbs.
Then the only thing you can really do after that is reduce friction and weight (both rotating and non-rotating).
This would be a good bike to consider - Ecotrons EFI conversions on it. Probably could use the EFI Throttle Bodies off an RC51.