PAIR System removal - SV650 & 1000 '03 on.

Originally Posted by Dodgy

I've got twin Arrow's on mine and the PAIR is not disabled and I only get a pop or bang on the over-run

I suggest leaving it intact - it causes no harm

True but its a couple of 1lbs of useles kit its only for fiddling the clean air test so you can remove it and no harm or extra emissions will pass into the atmosphere.

Whent to the local bikeshop yesterday and yes its the very same system and parts fitted to the 650 so if you want to remove it you can all you need is the two blanking plates and a resistor. Easy to do and a lighter bike when done.

Originally Posted by chewy22

The PAIR system is for pollution control.
SNIP
it does nothing for your bike performance except give it cleaner emissions.

I don't beleeev it!

Here are the finest engineers japan can find working their socks off to give us bikes with reduced pollution outputs and we disable the system involved because it sounds 'better'?

Expalin that to your grandchildren when the sea is slopping over the Thames embankment and we're all dying from skin cancer. "I thought my bike sounded better with the pollution control system disabled...'

All it does and i think i have explained this is it just adds extra air into the exhaust port to fool the emisions test and i do mean FOOL. By adding extra air into the spent emmisions.It does not clean up it can`t if you look at how it works so indanger the planet by removing i think not.

Originally Posted by chewy22

All it does and i think i have explained this is it just adds extra air into the exhaust port to fool the emisions test and i do mean FOOL. By adding extra air into the spent emmisions.It does not clean up it can`t if you look at how it works so indanger the planet by removing i think not.

I thought the idea of introducing the air was to provide oxygen to allow the unburnt fuel to burn, hence removing the unburnt hydrocarbons, so not fooling anything.

Me - I don't like popping or backfiring on the overrun.

Originally Posted by chazzyb

I thought the idea of introducing the air was to provide oxygen to allow the unburnt fuel to burn, hence removing the unburnt hydrocarbons, so not fooling anything.

Me - I don't like popping or backfiring on the overrun.

And i stress this point.
The HOPE is that the oxygen in this air will react with the unburned gas to form carbon dioxide and water thereby preventing the release of unburned hydrocarbons,

[johnnyrod]

That's why we catalytic converters, cos the process won't go all the way, plus the catalyst removes nitrogen oxides (they lead to acid rain), PAIR won't. Presumably it is enough for CARB in the US to be happy with, without having to go for catalysts.

Perhaps I'm missing the point of this thread, but is there a particular question?

QUOTE That's why we catalytic converters

Mine on my SV1000 is in the end cans so when you put aftermarket cans one its gone.

[johnnyrod]

The US 650 has PAIR a well doesn't it? The catalyst does need some air to burn the hydrocarbons and carbon monoxide in the exhaust gases, but it does some of this by using up the nitrogen oxides first. I'm not up on exactly how the SV1000 decides how it does it though. What was it you wanted to know?

Popping on overrun could be an exhaust leak near the heads, not necessarily the PAIR system. Not uncommon on bikes with aftermarket pipes.

Originally Posted by johnnyrod

The US 650 has PAIR a well doesn't it? The catalyst does need some air to burn the hydrocarbons and carbon monoxide in the exhaust gases, but it does some of this by using up the nitrogen oxides first. I'm not up on exactly how the SV1000 decides how it does it though. What was it you wanted to know?

Popping on overrun could be an exhaust leak near the heads, not necessarily the PAIR system. Not uncommon on bikes with aftermarket pipes.

My plan is to totaly remove the pair system from my bike. The Popping on overrun is caused by this system but it does not always emerge untill you fit aftermarket cans.
The US 650 has PAIR a well doesn't it? Yes