Crosswind sensitive GPZ (sorry - long)

Steve Northrop blackgpz at
Fri Apr 20 15:02:28 PDT 2007

Mr. Jameson hit the nail right on the head. Those vent tubes should be 
routed such that the ends see undisturbed atmospheric pressure. Stephen, if 
yours go inside the airbox, that is not a good place for them. I thread them 
up through the hole in the crossbrace beneath the gas tank so they are very 
high and in as still an air pocket as your going to find on a motorcycle. I 
don't have any crosswind problems at all.

Steve in Western NY
'96 GPZ1100
'02 Daytona 955i
"You Can't Fix Stupid", Ron White

----- Original Message ----- 
From: "Stephen Hampson" <shampson at>
To: "'Kawasaki GPZ1100 discussion'" <gpzlist at>
Sent: Friday, April 20, 2007 4:32 PM
Subject: RE: Crosswind sensitive GPZ (sorry - long)

>I have'nt experienced the crosswind problem but when I took the carbs of 
> another problem I had, just after I bought the bike. The two clear hoses
> from the carbs route into a hole in each side of the airbox. The hole is
> just behind the downtube and in the rear recessed part of the airbox.
> Now I don't know if this is correct it was just how mine was when I got 
> it.
> But by the ends being in the airbox they should not be affected by any 
> wind
> turbulence.
> On another matter of wind turbulence, I have just fitted some LSL type
> risers and have found that the bike is a lot more sensitive to cross 
> winds.
> Possibly due to the more upright seating position.
> Steve
> -----Original Message-----
> From: Bob Sims [mailto:bob.sims at]
> Sent: 20 April 2007 20:21
> To: 'Kawasaki GPZ1100 discussion'
> Subject: RE: Crosswind sensitive GPZ (sorry - long)
>> I could use some advice on this: Since the beginning of this
>> season my trusty old GPZ has become sensitive to gusty
>> crosswinds from the LEFT.
> Ped,
> I've noticed a similar problem w/my GPZ before, but normally only in very
> high winds (rare), and even then it was never enough to really bother me.
> I've heard of this happening with other bikes as well, some worse than
> others.  I think it may be the carb drain hoses that exit from the top of
> the carbs, and route beside the airbox.  These hoses are clear on my bike,
> and there is one per side.  The wind moving across the ends of one of 
> these
> hoses would create a vacuum within the carb bowls, momentarily starving 
> the
> engine.  If I remember, the hoses route between the airbox and the frame
> tubes, so the tips are close to the sides of the bike (and the wind).  I
> suppose you could try re-routing these hoses, or extending them, or 
> covering
> them with some type of breathable foam.
> A friend of mine many years ago had a Honda Hawk NT650, and this same
> problem would cut a lot of power to the bike when the wind angle was 
> right.
> Apparently, it was a "known problem" with the Hawks, and the fix was to 
> trim
> or re-route the carb drain hose so the tip wasn't exposed to the wind.
> Keep us updated, and hope this helps.
> Bob
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