Can I change the restrictor?

5 messages
17/11/2011 at 16:31

Hi all

I am just wondering the washers they put into the carburetor on a bike to restrict it to 33bhp can you take them out and make the holes bigger in the washers to allow more fuel and air into the engine. I dont want to take the washer out completely but i just want that extra power out of my bike.

Or would this not make any difference to the bike what so ever.  

Many thanks josh

17/11/2011 at 20:07
Depends what bike your talking about as some have different restrictors.

"WE LAUGHTED,IT WAS FUN."
17/11/2011 at 21:41

It's a kawasaki zx6r 2001 model carb fed

You place these washers in the carburetor wich restricts the amount of fuel that goes into the engine they have holes in them which i was just wondering whether or not i could make them bigger to allow more fuel to flow through them?

18/11/2011 at 02:19
If you place the washers in the carburetor to restrict the bike then the obvious derestriction is to unplace them - hoik them out to unrestrict it! Why so tentative about their removal?
Edited: 18/11/2011 at 02:22
18/11/2011 at 12:20

Sensible:

Taking a wild guess I'd say his license is still restricted & he wants it to "look" legal but have more power.

That said, a gradual increase in power seems emminently sensible compared to 2 years on 33bhp & bang! straight up to 100+.

Kawasaki:

Yes - larger holes will give less restriction. Roughly the power should increase with the hole area, i.e. with the square of the diameter. So if you make the hole twice as large, the power will be four times higher. If you want say, 66bhp instead of 33, the hole needs to be about 1.41 times larger.

You'll need to keep the hole very circular & very concentric, and also need to 

Do us a favour & upload a good quality picture of the washer - particularly noting if the hole has been "sharpened". Measure its diameter before & after, & note the difference in top speed.

It would be much more sensible to make up a 2nd set of restrictors - that way if you cock up making the holes you can have another go & still ride your bike in the mean time.

I do have a lathe & if you give me enough information I could possibly make you some - tho' not for a week or two as I'm recovering from a shoulder operation.

A point of caution:

If the police suspect your bike is illegal & inspect it, they will have seen more than enough restricted bikes to spot that the holes are larger than usual, will dyno test it, & plonk you into a world of fines & bans. And I suspect that because it would invalidate your insurance they would also have the right to seize your bike anyway.

Personally I'm in favour of a gradual power increase but the law is the law.


arrrf.
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