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4ride CAT removal

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Hi, in need of a little help, have sourced a 2nd hand ( new)  4rt front pipe ( without the cat) what do I do with the 02 sensor connection?

1 dealer told me just to disconnect and lose the wire and it would be ok ???

another knew what to do, but wouldn’t tell me, because I didn’t buy the pipe of them !..... great eh?.... they did tell me tank and air box needed to come off , but wouldn’t tell me anymore.....

help please..........cheers

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15 hours ago, northumbrian said:

Hi, in need of a little help, have sourced a 2nd hand ( new)  4rt front pipe ( without the cat) what do I do with the 02 sensor connection?

1 dealer told me just to disconnect and lose the wire and it would be ok ???

another knew what to do, but wouldn’t tell me, because I didn’t buy the pipe of them !..... great eh?.... they did tell me tank and air box needed to come off , but wouldn’t tell me anymore.....

help please..........cheers

It’s only the profit that makes things expensive, but that’s what keeps businesses going? It’s the same in most trades but some are helpful but others have manufacturers warranty and disclosure restraints imposed by their agreements. You’ll get all the help on this site though?

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20 hours ago, Nebulous said:

http://inside.hondamc.com/upload/techdoc/Microdata PDF/COTA/Kit Full Power Cota 4RT 260 (YM14-Eng).pdf

This link may help possibly. They remove restrictors in the inlet , in order to exploit the new un-restricted manifold. This would necessitate tank , injector and airbox removal. Remove cable , raise idle rpm back to 1,800.  Enjoy.  Check there is at least a 5mm gap between throttle-body and exhaust before re-assembly.

edit- possibly there might not be restrictors in the uk inlets.  But if there are , then it is likely that you would need a remap to achieve any true linear power benefits from your exploits.

The step of disconnecting the white/green wire on pages 5 and 6 causes the ECU to use a different map to allow for the extra fuel needed.

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Ok guys, on letting your info digest......

1) the full power mods allow more air, ( lid mod).........more fuel white / green wire mod and the  removal of the restrictor washer........then exhaust mods to get complete the flow improvements.......got it.

what happens if I just want to change the front pipe to get rid of that horrible looking CAT, and not  perform the remaining power up mods as above......

2)  can I fit front pipe and just disconnect the 02 sensor ( reading about 02 sensors tells me they do very little, only trying to optimse the fuel / air ratio which allows the CAT to be most  effective

thanks again guys !!

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Hard to say for sure but if I was going to try it I would not do the wire mod to prevent running the high fuel map.

I simple terms your risk when not doing the full switch is if you run to rich or to lean.  I would think it would run a bit rich maybe (best guess) and be ok... but I could be very wrong.

Edited by jonnyc21

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11 hours ago, Nebulous said:

 

If removing the O2 sensor cable switches the map in the ecu to a different mode - then it will “guess” the mixture needed across the rev-range from pre-programmed data - rather than O2-sensor feedback.  The ECU is now relying on air-temp sensors and flow/mass readings to address injector pulse-width.  All perfectly ok.

Leaving restrictions in the inlet , and removing them from the manifold - will not change the ecu’s ability to present a workable mixture to the combustion.  So no damage will ensue.  

Best to come back later , and tell us what your “seat of the pants” dyno tells you - after riding the bike with the new pipe.  But you may find the difference is small , the exhaust-note richer/deeper/sexier/barkier whatever - and the placebo effect of that gives you the feeling of a meatier bike under you.  Money well spent then!

O2 disconnect and ecu will not be able to match output to input and vic versa. Dump the cat but keep the O2 sensor that’s what a lot of tuners use to keep exhaust gas at optimum. ?‍♂️?

Edited by section swept
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Well got  round to changing the front  pipe on the 4 ride.

so, tie wrapped the 02 sensor out  of the way, and it fired up ....

1) engine management light cleared as normal,

2) when warm rick over as before ( seat of the pants tachometer)

3 no noisier than before

4) Runs clean through the Rev tprange, and pick up  does seem a bit sharper ( might be  my imagination, but front wheel does seem to lift easier)

5) and best of all that horrible looking (and heaviy) CAT is gone!

thanks again guys for all your support on this one ?

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Has anyone carried out this de-cat/power-up conversion on a standard 4-Ride?

http://inside.hondamc.com/upload/techdoc/Microdata PDF/COTA/Kit Full Power Cota 4RT 260 (YM14-Eng).pdf

Any recommendations for exhaust headers, or other parts?

Thanks in advance.

 

Edited by riffraffretro

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