Effective UAS

I dunno, with the weight to engine cc rules, I don't know if there is a clear cut answer...a fairly light driver like yourself could theoretically be really fast with a 2cycle...though the trend right now is many are running 250's & 450's as they want max hp underneath them...
 
BRC. Hands down. Anything bigger and you’re just bolting on lead to be legal. If you want to go bigger, two stroke 250 on a jackshaft. Both setups are significantly lighter, let you choose where you’re putting your weight and not to mention they are significantly cheaper in the long run and require far less maintenance. 2 strokes are the most efficient when it comes to power to weight ratio and lifespan.
 
At 175 lbs I think you might need a bigger setup option IMO. I am heavier than you but even when I went down to 185 lbs my 131 stroker Sudam wasn't enough. Consider Seay's drivers on the BRC were very light drivers, way lighter than you. I would get a good 250 or 270. At 175 lbs I doubt you might need to add much weight if any at all with most chassis considering the weight of the radiator and jackshaft, etc. JMO
 
GeneticTireWorks said:
how much power does one really need? is anyone really successful over 55hp?
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Size/shape/condition of tracks you intend to race on should be a big factor on how to answer that question...is 80-90hp drivable on a 1/8mi bullring? Is 40hp enough to keep up on a 1/4 - 1/3 - 3/8mi track with big sweeping corners? And if course, most obvious question...how good of a shoe are you? Personally, I consider myself pretty average, ive ran an open 131 Sudam... it was too much power/acceleration for the small bullrings around my neck of the woods, I switched to a lower hp 125 Sudam and have been having a lot of success so far with...less hp makes it a little easier to drive/control and be smooth...
 
Something like this!!!!!

PK 250
 

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BRC is a Canadian Engineering firm run by Riley Will and a couple others...made a big name for themselves in twin cylinder superkart engines, and now with a 500cc conversion for 250 and 300cc KTM's... Great piece of engineering. Available with a balance shaft or without, one is for kart roadracing, the other for short tracks. I think the BRC is the initials of each member, but I could be wrong...
 
I think the PK is your most user friendly bet. Pipe/carb orientation stays the same as MX, and you can easily stay on gas. Good useable power and the benefits of being caseless.
 
GeneticTireWorks said:
how much power does one really need? is anyone really successful over 55hp?
Click to expand...
You need 70-80 HP to win on the larger tracks against top competition. We run a Bob Berlin 250 on Gas using a 38mm Tillotson Carburator. Basically a YZ250 Cylinder and head. Wiseco Piston and crank. V-Force Reeds. The cases are manufactured in Bobs' garage. Very reliable and lots of HP. Budget is another consideration. Our experience is the smaller engines (125cc-150cc) require more frequent rebuilds and that the parts are more expensive.
 
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