[scott_nadeau]

Hi everybody,
I'm looking for jet recomendations.  The sled is a 1999 ZRT800, it has a D&D Power Breather and a D&D silencer...all else is stock.  I'd like to know how to jet for 0-2000 ft, 20-40 degrees F.  Can I trust the numbers on the stock airbox and add 20 for the Power Breather?

It had 370s in it before I added the silencer and airbox...

Thanks for any input,
Scott Nadeau
Concord, NH

 

[scott_nadeau]

just bringing this back up to the top...

 

[toydoc]

Scott, did you have the update done?
Arctic Cat ZRT800 '99 BULLETIN

Arctic Cat, Inc. has issued a service bulletin for the 1999 ZRT 800 for performance related issues. Update #637-193 provides correction for the factory setup of the sled and includes: Carburetor jets, needles and slides; clutching components including weights and springs; and a new muffler. Arctic Cat will also extend the engine warranty by one year. Arctic Cat recommends contacting your local dealer for details and update scheduling.

 

[Wink]

I had a 99 ZRT with the breather. At you altitude and temp. you should be able to run 350's.

 

[scott_nadeau]

Toydoc...I checked with the dealer Saturday, and the update was done on my sled at one time.  It looks like parts of the update have been undone though...the primary has a red spring in it.  The dealer is getting the full text of the bulliten for me today so I can go thru and check everything.

Wink...350s eh?  Wow!  I jetted up to 390 when I put the airbox on.  No wonder this thing is such a gas hog.  That would also explain why my wife's Ultra kept up with me across the lake yesterday.

I couldn't get any color on the plugs with a couple of full throttle blasts...I was worried that it was too lean!

Thanks guys...

 

[Darryn Duncan]

My brother in law is running 350's in his 99zrt800. He has all the recall stuff done.

 

[1000-IMP]

If I were you, I would not be asking people what size jets to run. Seeing as how differences in altitude, tempature, and air density play a big factor. Go out for a ride and just check the jetting with the plug and piston wash. And if you do not want to be jetting it every ride, just jet up a few sizes(one or 2 notches(if even 2) on the needles), and that will be it. the mods you did should not throw the jetting out too much.
Just make sure to check out the jetting on those cold days.