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Derestricting aprilia rs 125

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TDean122
Two Stroke Sniffer



Joined: 13 Jul 2014
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PostPosted: 17:13 - 13 Feb 2015    Post subject: Derestricting aprilia rs 125 Reply with quote
Hi, I'm going to derestrict my aprilia rs125 2002 it's got a power valve I'm going to put a de restricted cdi in it and remove the cat in the exhaust I plan on keeping the 28mm carb is there anything else that should be changed with these will I need to go with the colder plug if I do this ?

Thanks

Dean
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 17:16 - 13 Feb 2015    Post subject: Re: Derestricting aprilia rs 125 Reply with quote
TDean122 wrote:
Hi, I'm going to derestrict my aprilia rs125 2002 it's got a power valve I'm going to put a de restricted cdi in it and remove the cat in the exhaust I plan on keeping the 28mm carb is there anything else that should be changed with these will I need to go with the colder plug if I do this ?

Thanks

Dean


Any chance you can go back to school and learn a bit of punctuation?
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 19:33 - 13 Feb 2015    Post subject: Re: Derestricting aprilia rs 125 Reply with quote
TDean122 wrote:
Hi, I'm going to derestrict my aprilia rs125 2002 it's got a power valve I'm going to put a de restricted cdi in it and remove the cat in the exhaust I plan on keeping the 28mm carb is there anything else that should be changed with these will I need to go with the colder plug if I do this ?


The cdi mod does nothing for peak power. It removes a massive flat spot between 4750rpm to 6000rpm where as standard there is a massive amount of ignition retard. It does nothing outside that rev range.

Modifying the exhaust will help a little, but without fitting a power valve (or at least chopping the restricted one down) the difference will be minimal.

All the best

Keith
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 19:53 - 13 Feb 2015    Post subject: Reply with quote
Off topic?

OFF FUCKING TOPIC?

You fucking nob jockey.

https://www.bikechatforums.com/viewtopic.php?t=21811

https://i.imgur.com/lpC95p3.jpg
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TDean122
Two Stroke Sniffer



Joined: 13 Jul 2014
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PostPosted: 21:24 - 13 Feb 2015    Post subject: Re: Derestricting aprilia rs 125 Reply with quote
Kickstart wrote:
TDean122 wrote:
Hi, I'm going to derestrict my aprilia rs125 2002 it's got a power valve I'm going to put a de restricted cdi in it and remove the cat in the exhaust I plan on keeping the 28mm carb is there anything else that should be changed with these will I need to go with the colder plug if I do this ?


The cdi mod does nothing for peak power. It removes a massive flat spot between 4750rpm to 6000rpm where as standard there is a massive amount of ignition retard. It does nothing outside that rev range.

Modifying the exhaust will help a little, but without fitting a power valve (or at least chopping the restricted one down) the difference will be minimal.

It dose have a power valve what do you mean by chopping it Down?
All the best

Keith
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RhynoCZ
Super Spammer



Joined: 09 Mar 2012
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PostPosted: 21:42 - 13 Feb 2015    Post subject: Re: Derestricting aprilia rs 125 Reply with quote
TDean122 wrote:
Hi, I'm going to derestrict my aprilia rs125 2002 it's got a power valve I'm going to put a de restricted cdi in it and remove the cat in the exhaust I plan on keeping the 28mm carb is there anything else that should be changed with these will I need to go with the colder plug if I do this ?

Thanks

Dean


Can you actually talk like that? One long inhale and then spitting out all those words at one exhale? Impressive, if so. Thumbs Up
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 22:45 - 13 Feb 2015    Post subject: Re: Derestricting aprilia rs 125 Reply with quote
TDean122 wrote:

It dose have a power valve what do you mean by chopping it Down?


Does it have a working power valve, with control unit, solonoid, etc? If so make sure it is clean and free to move (and the right way up).

If it has the blanking plate then you can remove this, machine a bit from the end (~5mm), drill and tap the screw hole again and put back in so the chamfered end is flush with the roof of the exhaust port. This will give you the top end power of having a power valve just with stuff all at low revs.

The power valve doesn't so much give you top end power, rather allows so bottom end power to be salvaged when the exhaust port, etc, is set up for decent peak power.

All the best

Keith
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TDean122
Two Stroke Sniffer



Joined: 13 Jul 2014
Karma :
PostPosted: 22:49 - 13 Feb 2015    Post subject: Re: Derestricting aprilia rs 125 Reply with quote
Kickstart wrote:
TDean122 wrote:

It dose have a power valve what do you mean by chopping it Down?


Does it have a working power valve, with control unit, solonoid, etc? If so make sure it is clean and free to move (and the right way up).

If it has the blanking plate then you can remove this, machine a bit from the end (~5mm), drill and tap the screw hole again and put back in so the chamfered end is flush with the roof of the exhaust port. This will give you the top end power of having a power valve just with stuff all at low revs.

The power valve doesn't so much give you top end power, rather allows so bottom end power to be salvaged when the exhaust port, etc, is set up for decent peak power.

All the best

Keith


Yea it's a working one connected to solonoid. I cleaned and replaced the seals on it when I rebuilt the top end.

Thanks
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 22:52 - 13 Feb 2015    Post subject: Reply with quote
Hi

In which case, sort the exhaust (or replace with a decent one), use a colder plug and adjust the jetting maybe (rich is safe, so jet up a bit to check it is ok, then work down).

All the best

Keith
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