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(Date Posted:06/02/2008 4:46 PM)
G'day, I'm from New Zealand, and over here have a class of racing knowen as "Bucket Racing" Class Restrictions: 125cc 2 stroke restricted
0-150CC 4 stroke
Superbucket engines must be derived from non competition motorcycles. Motorcross, Road racing, Enduro and Go Kart
motors and transmission parts are not permitted. There shall be no restriction on the make, type or design of carburettor,
ignition, exhaust, piston, cam, valve springs or cooling system except for class eligibility.
All engines of less than 100cc capacity may be turbo or supercharged. 125cc 2 stroke engines are restricted to carburation
equivalent to a single 24mm carburettor and must be aircooled.Basically everything else is open except from fuel which is AVGAS. 100CC 2 Stroke can have watercooling and any size carburettor What the class is about is you get a cheap commuter bike and do whatever you can do to it relitivly cheaply and go out racing! I have a custom frame that someone in nelson has made up with 17" wheels and slicks. Motors have been a variety of honda singles until they blow up etc. I also have raced a CG125 in the production class quite successfully. I want to build a really fast honda single to beat all the FXR150's people are running these days. I was thinking the best idea would be to use a GL145 piston as it has the dome on it to bring the compession up. Gearbox, XL125S 6 speed? I have XL125S casings. Am going to use a RM125 flywheel and stator as it is very small and light with the stator going on the outside of the flywheel. GL145 crank as it is lightwheight with the two small webs. What would be the best idea for the head? I have a 185 or 200 head here that has been ported out nicely, or would I be better off to use a 125 head for more compression? Maybe better off with a GL145 head as it has a ballbearing cam and bigger valves? Could port out a GL145 head or an XL125S head myself? What compression ratio can I get and what is the maximum you can have without detonation on one of these engines? What about the cam and valve springs, what is the best option there? I have a mystery hot cam in stock, and I got some performance valve springs for a toyota 2E engine which are a bit stiffer than stock. I'm after massive power, it doesn't have to have a real broad rev range as I am road racing and it should be pretty easy to keep on the boil with the 6 speed box. How reliable can it be? I would like it to last a season before I have to pull it down and replace the valves, maybe replace the rod every second season? Any help and advice would be greatly appreciated! Cheers, Sam
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