Oh no...I have to check what I ordered... I must have ordered the Street version though, which is still ok with me, as it will still breathe better than the stock paper element type. With regards to gains...well I'm hoping with these gains..Hmmm... I would get a minimum of 3bhp increase which will be fine for a light bike as the 390...I'm not expecting major gains but I do want some performance improvement with an exhaust and airfliter mod.
Yes...I plan to go 2 up on the rear with a better looking aluminum and lighter sprocket as the stock's steel black sprocket looks cheap and heavy. Will also replace my 520 chain with new gold chain...I find 6th gear too tall...so, with a Plus 2 rear..it should be able to pull in 6th gear much better. Stock is 45T...I will go 47T... replacing the countershaft sprocket to a -1 will technically increase rear equivalent to a +3...which I think, maybe too much...
I would rather replace the ugly looking stock sprocket with a better looking lighter aluminum one with a lighter 520 gold chain....to add some punch and bling.
Yeah that is your best bet. But one thing is that i find aluminum sprockets get chewed up easily and need replacing faster then your conventional steel. It is heavier but they do tend to last longer. The best is to replace the front, rear sprocket and chain at the same time. And after a bit when the chain stretches make sure you adjust the tension.
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