Kawasaki GPZ500 Restrictor Dimensions

MattieG · Derestricted Danger Joined: 26 Sep 2009 Karma :

Hi all,

Just bought myself a 03 GPZ500 which I need to restrict. Does anyone know the dimensions of the restrictors? Or even better, does anyone have a set they don't need anymore?

Cheers

c_dug · Super Spammer Joined: 04 Sep 2007 Karma :

https://i235.photobucket.com/albums/ee81/paddy2007dug/GPZ500restricters.jpg

c_dug
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That_Hornet · World Chat Champion Joined: 23 Apr 2009 Karma :

Got a set for a 92 gpz. Probably different tho. Rolling Eyes

MattieG · Derestricted Danger Joined: 26 Sep 2009 Karma :

Thanks a lot c_dug. Am I right in saying those washers simply sit in the air intake manifold?

Don't think it's worth the risk using washers for a pre-94 gpz ThatHornet. Would kick myself if the bike turned out at 34bhp or something.

c_dug · Super Spammer Joined: 04 Sep 2007 Karma :

I believe so, never got them made in the end, didn't bother with restriction for my 2 years. My TDR was restricted when I got it, the restriction went between the carbs and air box on that.

Just measure the inlets and see where they would fit I guess Laughing

c_dug
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

gwion · L Plate Warrior Joined: 17 Apr 2010 Karma :

Am I right in assuming this would work on a 2000 GPZ500 as well?

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

The carbs, ignition curve and valve timing are identical (on paper) between the "new" and "old" ex500 motor.

The only major difference seems to be on the alternator where one has one pickup and the other has two. This is pretty irrelevant in terms of power output, just two ways of doing the same thing.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

GPZ_chris · L Plate Warrior Joined: 28 Aug 2010 Karma :

c_dug · Super Spammer Joined: 04 Sep 2007 Karma :

Hi,

Yes, the picture above is for the 33bhp restriction washers, should be able to get a set cut for next to nothing if you take a wander around a local industrial estate, don't pay the rip off price from the net.

c_dug
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

Nexus Icon · World Chat Champion Joined: 26 Aug 2010 Karma :

Out of interest, does anyone know what sort of temps get seen between the carbs and the airbox? I possibly need to sort a set of washers, like those above, but I've easier access to plastics and composites than steel and could make some carbon ones at work.

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

Well considering that the inlet manifolds tend to be rubber, not very high.