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Remove restrictors?

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fgclark123
Four's a...something...
Four's a...something...

Posts : 159

Remove restrictors?

Post by fgclark123 on Thu 26 Apr 2018, 11:03 pm

Just came across this video - https://youtu.be/QvlJp3MDcW8?t=1293

Any idea if this worth doing? Anyone done it? Is the difference in power noticeable? Any negatives, like worse fuel consumption?

I didn't even know it had these fitted. Thanks
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Grarea
the 900
the 900

Posts : 294
Location : Cornwall

Re: Remove restrictors?

Post by Grarea on Fri 27 Apr 2018, 3:38 pm

That is funny you posted that.
I watched that just the other day.
Before I took my carbs off.

The restrictors are put in there to reduce the power so that you can ride them on an
A2(Or whatever it is called these days) licence.

They are not generally in there.
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Jameshambleton
Moderator
Moderator

Posts : 2843
Location : Bedale, North Yorkshire

Re: Remove restrictors?

Post by Jameshambleton on Fri 27 Apr 2018, 3:48 pm

Get them out, GETTEM OUT!!!

They mess with the fueling causing the bike to not run properly all the way through the range. It's like making you run for half a mile while breathing through a straw. It causes a massive dead spot in the middle of the revs, typically 6th gear at 70mph you won't be able to hold it constant without adjusting the throttle more and more open over a period of about 10 miles.

The metal of the restrictor causes the petrol to condensate on the restrictor rather than going into the engine. I found once I removed mine the engine ran much better and mpg improved, not only that but the engine responsiveness throughout the range was much improved all the way through the revs from 2k upto the redline.

@Grarea , A2 is now 46.6bhp and you have to retake mod1 and 2 to do your unrestricted licence unlike before where it was 33bhp for 2 years and then you automatically got unrestricted.

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