blake,id love to see a photo of your plugs,any chance of posting one
Im having riding withdrawls!!! Help
21 - 24 of 24 Posts
I might try a reducer to limit air intake for the time being.... think NASCAR restrictor plate. Maybe a piece of tape around part of the cone filter ends...
I find that completely removing stock EX baffles usually makes more noise "HP" than performance HP. It's all a matter of balancing the intake volume, with negative pressure on the exhaust side. The baffles are part of a somewhat tuned system that produces negative pressure on the exhaust, not only emptying the cyl of unburnt crud but also creating a partial vacume on the intake that allows a full charge of fuel air mix to be delivered. I use the metaphotr that an exhaust system is simply a "passive pump".
On a two stroke "tuned" pipe, the negative pressure is created at the end of the pipe... IF enough fuel can be delivered this can drastically increase HP and revs. Usually a very narrow power band and sometimes a short life for wrist pins and piston skirts.
Obviously the four stroke is different but still relies on the principal of Neg Pressures on the ex side to help flow from the intake.. they must be balanced.
I guess what I'm trying to say is. You have increased air delivery potential, but without corresponding fuel increase (re jet) ... And also without increasing exh. capacity or pressures, it's not going to improve performance to simply put more air to it and richen up the mix..
disclaimer: I have "modified" many internal baffles with a drill bit.
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If the result of Hi test and octane boost running lean is letting you ride... It might be doing more harm than worth it in the long run.
J
I find that completely removing stock EX baffles usually makes more noise "HP" than performance HP. It's all a matter of balancing the intake volume, with negative pressure on the exhaust side. The baffles are part of a somewhat tuned system that produces negative pressure on the exhaust, not only emptying the cyl of unburnt crud but also creating a partial vacume on the intake that allows a full charge of fuel air mix to be delivered. I use the metaphotr that an exhaust system is simply a "passive pump".
On a two stroke "tuned" pipe, the negative pressure is created at the end of the pipe... IF enough fuel can be delivered this can drastically increase HP and revs. Usually a very narrow power band and sometimes a short life for wrist pins and piston skirts.
Obviously the four stroke is different but still relies on the principal of Neg Pressures on the ex side to help flow from the intake.. they must be balanced.
I guess what I'm trying to say is. You have increased air delivery potential, but without corresponding fuel increase (re jet) ... And also without increasing exh. capacity or pressures, it's not going to improve performance to simply put more air to it and richen up the mix..
disclaimer: I have "modified" many internal baffles with a drill bit.
If the result of Hi test and octane boost running lean is letting you ride... It might be doing more harm than worth it in the long run.
J
21 - 24 of 24 Posts
