Bike Talk Motorcycle Forum Bike Talk Motorcycle Forum


Go Back   Bike Talk Motorcycle Forum > The Garage > Motorcycle Tech Talk
Discussion on High altitude jetting within Bike Talk's Motorcycle Tech Talk forum.
Home Forum Register FAQ Sponsorship Search Today's Posts Mark Forums Read

High altitude jetting


Welcome to the Bike Talk motorcycle forum Contact Bike Talk Join Bike Talk

» Site Navigation
 > F.A.Q.
» Auction

» B-T Recommends:

Reply
 
Old Jul 31st, 2007, 05:12 PM   #1
humbucker
Newbie
 
humbucker's Avatar
 
Join Date: Jun 2007
Location: Nevada
Posts: 5
Model: 06 1200xlL
Interests: playing guitar
Occupation: engineer

Hello all ..thanks for many sleepless nights ..hehe My question is this, I have a 06 XL 1200L with only one mod V&H straightshot HS slipons, I get popping while im in a decell going downhill..I live at about 5000ft elevation and ride up to 8000ft I would like to ask for advice on if there is a special jetting for my altitude?(Im planning doing a stage 1 AC Also: ) and if the slipons that i have on are causing the popping? Thanks in advance to anybody who can help.....

Last edited by humbucker : Jul 31st, 2007 at 05:13 PM. Reason: mess up
humbucker is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links

Old Jul 31st, 2007, 07:18 PM   #2
ironhorse
Has posted 500+
 
ironhorse's Avatar
 
Join Date: Sep 2006
Location: cheyenne wy
Posts: 780
Model: 06 flhxi
Interests: family,fun, fast chrome
Occupation: causing hate and discontent
View ironhorse's Gallery
5 Images Posted
ok this is most likely a stupid question but first welcome, the question is for it being an 06 is it really carb if so put your breather on and yes you will need to adjust your fuel to air mix and ken will most likely chime in but if it is fuel injected re mapped and you will get input for ethier set up here lotta knowledge here.
ironhorse is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old Jul 31st, 2007, 09:03 PM   #3
chucktx
Moderator
Has posted 500+
 
chucktx's Avatar
 
Join Date: Jul 2005
Posts: 4,266
View chucktx's Gallery
31 Images Posted
if you are running a carb, it should adjust itself to that altitude....i would check the clamps on the pipes, as you are probably sucking in cold air and that is where the "pop" is comming from. also if efi the onboard puter should handle that altitude also....have fun and welcome to the forum!!!!
chucktx is online now  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old Jul 31st, 2007, 09:05 PM   #4
Peyts
Has posted 500+
 
Peyts's Avatar
 
Join Date: May 2007
Location: Calgary, Alberta
Posts: 667
Model: '07 Harley Davidson ElectraGlide Classic
Interests: Riding the bike (and the wife!)
View Peyts's Gallery
2 Images Posted
Humbucker... I presume that you have a high-flow air cleaner on it, and have also done some rejetting to the carb. If not, most likely your popping is being caused by the bike running too lean. You need the high-flow air cleaner (such as a Screamin Eagle one)... then you need to reject your carbs to get more fuel to the "delivery system".

A standard rejet kit that you buy off eBay won't do the trick because of your altitude. But if you buy a full rejet kit, then you will have the jets that you need.

As for the exact jet sizes... can't tell you. Perhaps someone else on the forum can help. Or ask someone at a local bikeshop... they will need to change the jets on all bikes that are sold in your area, as the jets are set to sea-level use when they come out of the manufacturer. Barring all that... you will have to figure out the jet sizes by trial and error.

Good luck!
Peyts is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old Jul 31st, 2007, 10:15 PM   #5
Hot01
Has posted 500+
 
Hot01's Avatar
 
Join Date: May 2004
Posts: 651
Model: '01 FXST
View Hot01's Gallery
22 Images Posted
I was wondering about this today. I came through Nevada on 50 and my bike was choking at 80 MPH. I wondered if it was the altitude. I've been getting really bad gas mileage all along too, so I'm not sure if it's the altitude or the jets. I'm having the dealer take a look at it tomorrow when I take it in for a new tire.

Good luck!
Hot01 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old Jul 31st, 2007, 10:51 PM   #6
kenfuzed
Administrator
Frequent Posting Club
 
kenfuzed's Avatar
 
Join Date: Jan 2005
Posts: 1,237
Model: Harley FLHX
Occupation: Web Developer by day, 25+ years of carb building by day, hey what happened to my day?!
View kenfuzed's Gallery
13 Images Posted
Typically your altitude would lead to a rich condition rather than being lean, so jetting larger could actually work against you. Adjusting your mixture screw could help slightly with the decel pop but be careful you don't go too rich (check your plugs). What you are likely experiencing is reversion from your pipes, and possibly even an exhaust leak. If your pipes or mufflers are drawing cooler air back in this will cause your decel popping.
kenfuzed is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old Aug 1st, 2007, 12:36 PM   #7
Red Rider
Has posted 500+
 
Red Rider's Avatar
 
Join Date: Jul 2006
Location: Churchill County, NV
Posts: 629
Model: '99 FLHR Road King
Interests: Ride, Hunt, 4X4, Fish, Cigars - the good things
Occupation: U.S. Navy - Retired
View Red Rider's Gallery
18 Images Posted
Yep, you need to be tuned for not just our higher altitude, but our even higher "effective altitude". Northern Nevada isn't just high up, it is also friggin dry & hot. When it is hot, the air density decreases even more than the standard for elevation. For instance, a 70 the effective altitude is relatively equal to the actual, but at 95 your 5000ft is effectively about 8000ft for volume of oxygen in the air. I've been told that the lack of moisture makes this effect more pronounced here than in other places. ie; the eastern slope of the Rockies or western Sierras.

Now for the disclaimer: this is what I have been advised, but I didn't see the actual equations. I do know I was running richer than I wanted before I went and got it dyno-tuned in Reno.
Red Rider is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old Aug 1st, 2007, 06:31 PM   #8
humbucker
Newbie
 
humbucker's Avatar
 
Join Date: Jun 2007
Location: Nevada
Posts: 5
Model: 06 1200xlL
Interests: playing guitar
Occupation: engineer
Thanks to all who replyed ..I will look into the exhaust first, because thats the only thing I did to the bike...I will get rid of the stock air box soon and rejet...and report back...thanks again and See Ya on the road
humbucker is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Reply

«- 06 St Bob Goes Boom « Previous | Next » Crane HI-4 Ighition -»



Thread Tools



Similar Threads to: High altitude jetting
Thread Thread Starter Forum Replies Last Post
Proper jetting for altitude/stage 1 kit rkortan Motorcycle Tech Talk 8 Nov 28th, 2007 05:41 PM
High idle sometimes cowboy Motorcycle Tech Talk 11 Jul 30th, 2007 09:13 PM
jetting bigsean Motorcycle Tech Talk 8 May 29th, 2006 09:36 AM
Idling High Nerodemus Motorcycle Tech Talk 6 Nov 7th, 2005 02:06 AM
re-jetting ronstar Motorcycle Tech Talk 2 Jun 30th, 2004 11:33 PM

Powered by vBadvanced CMPS v3.0 RC1

All times are GMT -7. The time now is 10:35 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.0.0 RC8
BikeTalk Motorcycle Forum Copyright 1997-2008 all rights reserved


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94