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Bigvalve On Stock Bore

odie

odie

Super Veteran
paps i know ive read here that using bigvalve on stock will not benefit our bike,its between with sir rowan and i cant remember who?who is saying that raider not the 150 the old one i think is 125 that uses the same valve size and theorize it will have the same effect with our bike, but sir rowan said thei've tried it and it does not work that way in our bike something like that if ive remembered it right their exchange of opinion,better ask sir rowan as they are testing different setup for our bike, wow haba nobela ahihihihihihi!
 
suplado010

suplado010

Super Veteran
according to sir macoolet if your snipey runs 120kph topspeed if you install your bigvalve to your stock bore your lucky if your snipey runs 80kph topspeed....:)
 
turbulence

turbulence

Super Veteran
im just wondering. is it not using bigvalve is same theory as using big carb just like our stock carb 22mm changed to 28mm keihin? don't they both increase the fuel supply which increases performance?
 
macoolet

macoolet

Super Veteran
turbulence said:
im just wondering. is it not using bigvalve is same theory as using big carb just like our stock carb 22mm changed to 28mm keihin? don't they both increase the fuel supply which increases performance?
Click to expand...
they do differ.using a bigger valve is not the same as using a bigger carburetor,increasing the diameter of the carburetor will not guarantee that your bike will run faster,sometimes it will just lead you to money wasted,there are lots of explanation regarding the said comparison,it's not just the size that will affect the performance,replacing the stock diaphragm type by the common keihin's or oko's like 24,26 or 28 mm carb,you will notice that the delay in the throttle response will be gone,of course with the right jettings.this is just one of the main advantage of replacing the stock carburetor.as for the bigger diameter of the valves on stock bore,it's not only the size that will affect,it's mainly the combustion chamber.as always our first option we can just port the intake and exhaust passage and replace the cam with a higher lift and longer duration and increase the volume of the combustion chamber to maximize the potential of the stock head.but if there's too much compression that can't be handled by a full potential stock head,then we need to replace the stock valves with a bigger diameter and bigger passage for the intake and exhaust..it's like this, gasoline from the tank to the carburetor,gas throttle,the carburetor will pump gasoline to the manifold to the head via the intake valve and to the combustion chamber=where the compression is converted to power then to the exhaust valve and to the pipe..hays sana tama
 
Ginger

Ginger

Super Veteran
macoolet said:
they do differ.using a bigger valve is not the same as using a bigger carburetor,increasing the diameter of the carburetor will not guarantee that your bike will run faster,sometimes it will just lead you to money wasted,there are lots of explanation regarding the said comparison,it's not just the size that will affect the performance,replacing the stock diaphragm type by the common keihin's or oko's like 24,26 or 28 mm carb,you will notice that the delay in the throttle response will be gone,of course with the right jettings.this is just one of the main advantage of replacing the stock carburetor.as for the bigger diameter of the valves on stock bore,it's not only the size that will affect,it's mainly the combustion chamber.as always our first option we can just port the intake and exhaust passage and replace the cam with a higher lift and longer duration and increase the volume of the combustion chamber to maximize the potential of the stock head.but if there's too much compression that can't be handled by a full potential stock head,then we need to replace the stock valves with a bigger diameter and bigger passage for the intake and exhaust..it's like this, gasoline from the tank to the carburetor,gas throttle,the carburetor will pump gasoline to the manifold to the head via the intake valve and to the combustion chamber=where the compression is converted to power then to the exhaust valve and to the pipe..hays sana tama
Click to expand...
here oh. they shared na:p !!!bad English hehe
 
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