Join Date: Dec 2015
Location: Barrow County, GA
Silly question about block off plates
Sooo, I've been trying to get my ZX600C back to running like it should be. I took out the fuel evap system, and installed block off plates for the reed valves from the start. Today however, I took out the block off plates, and let the AIS system work the way it came. The bike has more power now without the block off plates. From everything I read up, the block off plates only affect emissions, not how the bike runs. I still left out the fuel evap system though. So here's my silly question(s):
Why would removing the block off plates add power? Could the stock jets "require" the reed valves to run properly? If I want the block off plates, do I need to re-jet?
I know the AIS injects fresh air into the exhaust for emissions; and primarily to help burn excess gas via the catalytic converter. I didn't think the 1990 ZX600 had a cat. I'm happy the bike has more power now, and I have no issue leaving it the way it is. I am just curious as why.
Bike info: 1990 Ninja ZX600C, stock intake, stock exhaust. Main jet size 105. Pilot Jet size 35. Mixture screw is 2.5 turns out.
Last edited by metalpeddler88; 05-08-2016 at 07:51 PM.
Reason: added bike information