I have a 2003 ZR900 with stock clutching, carbs, pipe, y-pipe, air box with tubes installed. The pipe has a slight dent in it. The sled has a 136 Extension kit, 1.5 inch lug track. I am only seeing 90MPH on the speedo and my gas mileage is awful at 8.5MPG
The sled seems to run fine and snappy on the trail. No bog. I idles real high until I choke it. Idles great cold, when you first start it up.
I don't know if the jetting is stock. I bought the sled used. Never really idle well from day one.
I need some help with this one. I would like to see the top end past 100mph and the gas mileage around 12mpg.
I want to address the high idle issue. I just picked up an 02 ZR 800 with 750 miles and the things is awesome. When it is cold it idles nice but once warm when you come to a stop it idles high; you have to blip the throttle or choke it down. I started a topic here two weeks ago and many responded that it was normal. I tend to beleive this as I bought a brand new 04 Viper S and it did the same thing from the day it was new. In fact, this issue was big in Snowtech back in 04 and I remember the cause being the flat slide carbs; design flaw that allowed air between the slides. It seems that most everyone on here has commented on a high idle. Some say it's normal, some say it's an air leak and a burn down would be innevitable if not addressed.
So here is my question to all of you. If you have a very high idle, and you choke it down and leave it, if you had a true air leak from a crank seal or boot, wouldn't she creep back up to a high idle????
I called the dealer that I bought it from and he said that it's a normal condition for the flat slide carbsed sleds. He is the largest cat dealer in the US; Livingstons in NH.....
I am always very cautious and I beleive in preventative maintenance but is this really an issue or not? I have a bumper- bumper season warranty on my sled so if they thought it was an issue, wouldn't they want it back to fix the problem before bigger damage occurs???
The exhaust is really hot after your riding and when you come to a stop the exhaust still draws air through the carbs causing the sled to idle high, I guess you could call this updraft .
All the flats exibit the same thing, its a fuel/air idle circut thing thats beyond my paygrade. Usually when its cold out its worse, leaner mix. Best luck i had wasnt to richen up the pilot jets but to open the fuel screws a little at a time (and yes its easier with the 90 degree tool made for it) until after you stop and it drops to proper idle within 10 seconds. I could make it drop right away, but then the damn things too rich. Be sure your off the post on the idle setscrew before adjusting it, just a turn makes a big difference.
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