High altitude jetting?

[3TV]

I will be going on vacation next week to the Skyline Drive area of central Utah, and would like to get my jetting somewhere in the ballpark before going.

 

Stock Banshee with K&N filter and K&N power lid on the airbox (essentially an open airbox).

 

Altitude will be 9000 to 11000 ft.

 

I'm guessing that stock jetting with no airbox lid will be "in the ballpark". Am I going to be close?

 

Thanks.

 

3TV

[sredish]

In my "Troubleshooting your jetting" thread stickied at the top of this forum, there's a good section on jetting to different altitudes. Just use what you have now and then it'll explain how to get your new baseline for a different altitude, or at least it should...

[3TV]

Thanks for the good post on jetting.

 

I guess what my real question is: . . . Is the removal of the airbox lid going to be enough to offset the increase in altitude? My Banshee is jetted a tad too rich at 5000 ft with the airbox lid on. If I remove the airbox lid, keep the same jetting, and go up another 5000 feet in altitude, will the jetting still be ok, or will it be too lean, or too rich?

 

3TV

[sredish]

Thanks for the good post on jetting.

 

I guess what my real question is:  .  .  .  Is the removal of the airbox lid going to be enough to offset the increase in altitude?  My Banshee is jetted a tad too rich at 5000 ft with the airbox lid on.  If I remove the airbox lid, keep the same jetting, and go up another 5000 feet in altitude, will the jetting still be ok, or will it be too lean, or too rich?

 

3TV

400920[/snapback]

 

Honestly, we can't really answer that. That's in the "every quad is different" philosophy. Chances are, it might be alright, but no one can really tell you. You just have to get there, try it and see how it runs. If it's good, check the plugs and then go for it, if not, then you might have to do a little bit of jetting. My guess is that it'll be just fine.

 

Also, you won't be able to jet for the climate before you get there. You can't put in a "baseline jetting" for somewhere your not because you won't know how it'll run there. You'll have to wait, try the airbox lid and see how it performs, THEN decide if a change in jetting is needed.

 

Hope that helps.

Scott

[bansheeryder_69]

what sredish said, my guess would be that it would work but take extra jets just in case

[rzcolobanshee]

I go from 5000 to 10000 fairly often and you really don't notice a huge difference, taking off the lid would probably be enough, or one jet size

[3TV]

Just in case anyone is doing a search on high altitude jetting in the future, I'll post this for follow up. With an otherwise stock Banshee, going from a stock airbox to an airbox with a K&N powerlid required changing from the 4th to the 6th notch with the needle clip, and changing from the stock 200 main jets to 340 main jets. I thought that was surprising, considering the 8,000 feet altitude we did the jetting at. The bike ran strong though.

 

3TV

[rzcolobanshee]

ummm BS you could run without an airfilter and still not need that big of a main on a stock banshee, and there's only 5 clips on a stock needle

[Banshee~]

Just in case anyone is doing a search on high altitude jetting in the future, I'll post this for follow up.  With an otherwise stock Banshee, going from a stock airbox to an airbox with a K&N powerlid required changing from the 4th to the 6th notch with the needle clip, and changing from the stock 200 main jets to 340 main jets.  I thought that was surprising, considering the 8,000 feet altitude we did the jetting at.  The bike ran strong though.

 

3TV

403262[/snapback]

What are you talking about? There isent a 6th notch on a stock needle, you might have a toomey needle. Im running a 320 main with pipes, K&N, lid off. What kind of elevation change did you do when you added the filter lid?

[3TV]

The needle clip is in the bottom groove, which is two lower than stock. So my bad, I thought there were six grooves. We went from 5000 ft and 95 degrees with the lid on, to 8000 ft and 68 degrees with the K&N powerlid. Our first attempt was with the stock jetting, and it was way way way too lean. We settled on what I reported. Have a good one.

 

3TV