07-18-2016, 01:04 PM
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Join Date: Sep 2014
Location: Orange County, CA
Posts: 410
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Quote:
http://chinariders.net/showthread.ph...highlight=dyno I was using a conservative 10% drivetrain loss instead of 15%. But the fact is that the dyno is rear wheel, and the engine is delivering the advertised horsepower. About performance... the muffler probably frees up a little (maybe 1 hp?) which is tough to feel. But the throttle response is good with the aftermarket muffler. With the K&N filter (and this is based on riding around the parking lot near my house), the bike feels like it's breathing better and is more responsive. I don't know how much of that is wishful thinking vs. actual performance. My "test" will be next weekend when I can get in a ride and see if there's any top speed and drivability improvements. In terms of the part - I want to re-measure the throttle body as this filter (K&N part number RC-1290, 48mm inside diamter) is a little big for the throttle body. I think the cone filter the Grom riders are using (K&N part number R-1100) might work better with its 43mm inside diameter. And whatever filter is being used, having a 10 degree (or so) bend is necessary to clear the airbox (which I sealed off with foil tape for this experiment.) Bear in mind that in this location, the filter will be exposed to a lot of dirt and moisture. I plan to purchase a Filterwear Pre-Filter for the cone filter to help filter dirt/dust and water. I'm also planning to use some aluminum tubing to extend the filter into the stock airbox (and make some more breathing holes) to see if that makes a difference. Like I wrote... I love to tinker. 
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