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how to remove AIS from R1 quicky
bitsilly - 4/7/08 at 12:29 PM

I know I should block the ports left into the exhaust chambers, and the pipe from the crankcase breather can be replaced by a breather, but can anyone tell me the best thing to do with the small pipe that runs from just under one of the carbs to the AIS,
ie should I block it or leave it open?
Cheers

richardh - 4/7/08 at 12:52 PM

i left mine open
haven't noticed any issues so far............

bitsilly - 4/7/08 at 01:01 PM

Good to know as mine currently open but...
As far as I can make out, it seems to carry a vacuum to a switch like a vac advance in the AIS, which I guess is a sealed unit, and so I would be inclined to seal it?

Anyone know definitely??
cheers

StevieB - 4/7/08 at 04:51 PM

Malc at Yorkshire Engines told me to take off the AIS and just link one outlet back into another with some hose, so you have two loops.

If I have time, I'll be making something using copper pipe (or maybe ali, if I can get it TIG'd somewhere)

bitsilly - 4/7/08 at 05:05 PM

Guess that would work, but the fittings can slip off quite easily and with the weight of the pipes unsupported...
I just cut my tubes, squashed them in a vice, bent them over and squashed them again!

Still need to know best thing to do with the carb narrow pipe though!

Ed

bitsilly - 4/7/08 at 08:21 PM

Anyone??

Coose - 5/7/08 at 09:57 AM

Leave it in place. It doesn't cause any problems.

StevieB - 5/7/08 at 02:47 PM

I was under the impression it causes problems with the SVA emissions test for a car application.

bitsilly - 5/7/08 at 07:17 PM

It can also make it impossible to be properly tuned on a rolling road as the action of mixing air in confuses the readings etc.
Anyway, it's already off!

Coose - 6/7/08 at 10:55 AM

quote:
Originally posted by bitsilly
It can also make it impossible to be properly tuned on a rolling road as the action of mixing air in confuses the readings etc.
Anyway, it's already off!


It doesn't if you don't connect up the rubber hoses. The valves stay closed as if they're not there as they only open on a vacuum in the inlet tract.

Mine did 7000 flat-out miles and ran perfectly!

StevieB - 6/7/08 at 10:56 AM

t shouldn't cause much of an issue on a rolling road because IIRC it's only active when the engine's cold. I think. Maybe.

bitsilly - 6/7/08 at 11:12 AM

That makes sense. But my power to weight ratio has shot up since I took it off, by at least, oh I dunno, but I also plan to have a pee before next track day and wear no socks...whohoooo!

That tract is the one I'm trying to find out about I would guess. I presume it should be closed off then?

StevieB - 6/7/08 at 11:59 AM

Eat plenty of fibre for a week before too -hed a bit extra weight

A u2u to either Malc (Yorkshire Engines) or a call to MNR will probably give you the answer