Been unleashing some HP on the bike today to help out the new member with his SRX . Via the feel , the secondary carby feel's like it kick's in around 5200 RPM , as the rev's climb pretty fast after that. Not to bad for a old school 4 stroke engine. As mentioned i've only rev'd the bike to 6000 RPM through the gear's , so have no idea what the performance will be up to red line , and how i ride these day's , i'll never rev the bike to it's limit's anyway. I can easily get up to 60MPH with ease ( even with the beached whale on the bike , me ) , and i don't seem to be using that much throttle to get there either. As for the fairing , i personally would re-fit one , as at highway speed , they do work pretty well. The wind from the fairing screen hit's me on the lower part of my helmet , so not much on the chest as such , so less drag as we don't have huge HP on tap to blast through the air , but have to agree the total price will add up though to re-fit a fairing. Re tyre's For other owner's reading this that are also looking into tyre's the stock sizes are: Front 90/90-16 48S Rear 100/90-18 56S There will be no issue's going 10mm over , the picture's below are the tyres i have fitted at the moment. The tyre's listed below are available to suit our bike's here in Australia , but hate to say these are not available in the USA (made a call) , unless they are privately sent to you. Bridgestone BT-46 Front 100/90-16 BT-46 Rear 110/90-18 BT-46 If you'd like more picture's of anything , just ask .