Join Date: Sep 2010
Location: Penang, Malaysia
Mentioned: 0 Post(s)
Try higher pressure, 33psi front and 38psi rear. (I've done 34psi front and it was too bumpy).
Also, your 09 is Open Loop control system as it is without the O2 sensor. Now that is fine if exhaust and air intake is stock. Now that you have a Leo vince and a high flow rate air filter, it would make the mixture lean which under powers the bike at high end. Low to Mid range should be more responsive but high end suffers.
Had my ex 250R Ninja swapped to high flow air filter and aftermarket header pipes and can. Top speed, 150 kph but it struggles to maintain and falls down to 140 kph. It's a carb bike so it needed tuning to the jets but I didn't touch anything. Would be about the same for a Fuel Injection system that is Open Loop. But 0 to 140kph is very quick but once it hits 140, it is out of power. A stock 250 should hit 165-170, with proper gear shifts.
A PC commander may help you get the right mixture to get back the top speed, else, swap back the stock air filter and have a go although, the Leo Vince may need to go too but let's take one step at a time.
Present Ride: Yamaha Super Tenere 2012
2011 to 2015 2011 Versys Spark BlackKawasaki Ninja 2010 to 2011 250R 2008 Plasma Blue
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Last edited by 2daMax; 09-27-2011 at 10:12 PM.