Friday, 20 April 2012

aprilia RS 125 decat exhaust derestriction RS125






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Aprilia RS 125 de-restriction

aprilia rs125 exhaust derestrcit de-cat 

aprilia rs125 exhaust derestrcit de-cat

Exhuast Derestriction
The aprilia rs125 bikes built after 2003  have a CAT inside of the expansion chamber.
 In the expansion chamber not the end can.


To get rid of this CAT which makes your bike perform differently to reduce emmisions nonsense 
, get an after market expansion chamber ie Sports exhaust or buy an earlier expasion chamber from an RS125 built before 2003 becarfull as ive bought old ones only to find they have been changed and it had a cat in !! , or take the expansion chamber off  cut it open, remove the CAT and weld it back together.

If you are going to buy a different expansion chamber then it you will need  to  to rejet your carb and test 
for running conditions ,  plug chop.

The bikes with a CAT in them are set to run rich (more oil) because the CAT requires the bike to run like this. Therefore you will need to buy a standard main jet for your carb. If you have a 28mm carb  then your standard main jet size is a 120. 

If your carb is a 34mm your main jet is more likely to be a 158 You can get these quite cheap. This means taking your carb off and removing the old main jet, and replacing it with a new one.
The snorkel in the air box can be taken out too, this will let some more air in  and make your bike sound a lot better.
 Just pull the rubber out the top, or you can cut the part that sticks out. This shouldnt affect your jetting since the bike is not jetted correctly from standard anyways. If you want to be sure stick a bigger main jet in (121 on a 28mm carb). Do a plug chop to confirm. 






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