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You IF stock...the only way to tell tru...is dyno before and dyno after. NO way a 300 kit lost more than 20 ish hp pending wheel style and chain adjustments!
When I first dyno the MULLET for custom map of my old one-off HMFs it had the 330 kit at that time. 1st pull was 128hp. Then well tuned and mapped to 150hp.....and its a genI. Figure stock GenI, full custom exhaust, BMC race filter, PCIII, and a custom map...so what did I loose? guessing 25hp ONLY. Converted to the OSD 330 ( SINGLE CHAIN ) redyno for a +5 hp and +5 torg.
I have a stock widened rear wheel for my 240 so I know I gained rotating mass while my swingarm is definitely lighter than stock. While I added the new wheel and chain, figured I'd go ahead and get a +2 black Driven rear sprocket. I honestly haven't noticed any HP loss, in fact my rear wheel seems to spin easier in 1st.
The +2 in rear sprocket change kept the torgue up so you did nt notice anything. For a 240 kit....widening the stocker is the way to go over PM or RC billet wheels, eight savings.
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