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Conference csc32::fxrs89::cycles

Title:The NEW CYCLES Notesfile
Notice:NEW NOTERS READ NOTE 1, FOR SALE/WANTED NOTES 3,4,5
Moderator:CSC32::BUTTERWORTH
Created:Fri Apr 06 1990
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:493
Total number of notes:25675

491.0. "High alt carb adj ?" by CSC32::FRSBEE::BOHANEK () Wed May 14 1997 08:47

    
    
     I am planning a trip to Sturgis S.D. this August and am wondering if
     I have to make carb adjustments before I go, due to the higher altitudes
     thinner air etc.
    
     Any inputs/experience 
    
    
     Brian 
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491.1NopeCSC32::MDS002::FRASERWed May 14 1997 09:3210
Hi,
If you lean out the carbs for the high altitude, you will be too lean where you
are at. Unless you re-jet as you go, which is a pain in the butt, I'd just leave
it alone. I live at 6500 feet and just ride my street bikes as they came from
the factory. I've ridden my CBR1000 from home (6500 feet) over several passes
(11000+�feet), down to Phoenix AZ. (~1500 feet) and back over more passes
without a problem. Unless you run into real drivability problems or are
concerned with max performance at a particular altitude, just ride it as is.

			Brian... 
491.2CSC32::NWD002::SCHWENKEN_FRSurrounded by Gotcha'sWed May 14 1997 10:087
    RE: -.1
    	Right on. Sturgis Municipal Airport is at 3280'. I rode from Boise
    (2850') thru Montana (4000+') and Wyoming (lotsa miles >7000') to S. 
    Dakota thru passes over 10,000' and didn't notice any performance
    degradation with the Maxim 1100. 
    	I'd only consider carb adjustment/re-jetting if you're going to
    race once you get there.       
491.3The bike should be OK as long as its not already running richCSC32::T_ABDELLARunning wild through the mountainsWed May 14 1997 17:2015
    
    Colorado Springs is at 6000 ft and when I bought the Concours it did
    not run correctly. The factory rep said it would need to be rejet for 
    the high altitude. They ended up doing a number of other things to get
    the bike to run correctly in the end. When I checked to see if
    rejetting was something done for all bikes sold in Colorado, I was 
    told no. To pass EPA most bikes are tuned very lean from the factory   
    so they do not need to be rejetted.
    
    You will loose power as you increase altitude but that would happen 
    even if you rejet. Two stroke motors are a different case and they
    normally need to be rejetted. 
    
    	My thoughts,
    	Tony
491.4CSC32::CSC32::CSENCSITSWed May 14 1997 19:206
I've had several bikes that I've run from sea level to 14k feet.  If you have
standard CV carbs the most you should have to do is turn up your idle.  Just
keep in mind your bike will not be as fast or pull as hard at the higher
elevations.  Can be a problem when passing!

John C.
491.5CSC32::KAONIS::HYNDMANFire Storm TrooperThu May 15 1997 11:5511
    
    
    I wouldn't worry about it.  I've riden my zx-11 and a concours that
    live near sea level out to strugis and all around through the rockies 
    without any problems.  If you were moving to the springs of similar
    location it might be a concern but not for a trip.
    
    
    Scott