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flat low to mid rpm performance

Joined
Dec 18, 2002
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#1
i have installed a fmf gnarly pipe, removed the air box lid, k&n air filter, rad reed as suggested on the forum and the bike is very sluggish up to mid rpm after that it rips. I live at 6800' above sea level and would like a little more low end performance any help would be appreciated thx in advance
 

moridin

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Dec 30, 2003
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#2
If you are running stock jetting - you are way rich (sultan like) up there in the clouds.

Check the jetting section on the FMF site for your bike and try dropping 1 on both the main and idle. That would be a good place to start. You will probably have to go even more.

sn
 
Joined
Aug 19, 2003
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#3
like mordin said , time to jet it :) your running a little rich , i'd start off going 1 leaner on the main and doing a plug chop and see where your at . read the jetting tips it helps understand whats going on with your carb. , it helped me through it .
 

moridin

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Dec 30, 2003
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#4
I came across this really nice matrix that broke jetting apperature size down by altitude. While it isnt 100% accurate - it is probably 99% there.

You basically get your bike baselined at sea level and use the percentile adjustment from there. Ie if 152 main at 700 feet - then at 6000 feet would be 155*.94=145 (or something like that).

I used this several times on previous bikes and it is dead on for trips out west.

I will see if I can find the link.
 
Joined
Sep 29, 2003
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#5
moridin---the matrix is on this site under tech tips/carb tuning---and it IS very accurate per my experience!
 
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Apr 15, 2002
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#6
At those elevations you will be way down on power and you would probably enjoy a 12 tooth countershaft sproket, but jetting is the key.