Performance mod quick qiestion - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 14 (permalink) Old 02-10-2004, 02:50 PM Thread Starter
 
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Performance mod quick qiestion

allrighty on my bone stock 98 F3
D and D sho in Go alum. slip on
K and N factory replace filter

would i need to re jet or would i be fine?
thanks
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post #2 of 14 (permalink) Old 02-10-2004, 05:27 PM
 
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you dont need to. but you might anyways just to get alittle more
out of your ride.

im running a full D&D pipe, factory ignition advancer and a K&N
filter. i had to have mine jetted. stage 2.
it makes 87.7 hp at the wheel at 11,800 rpm
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post #3 of 14 (permalink) Old 02-10-2004, 05:44 PM Thread Starter
 
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thats pretty nice specs....i'll prob stay stock jets if i sont have to go bigger....my air filter is so dirty right now its almost all black...i bet when i throw the slip on and air filter i will noticed a differnce
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post #4 of 14 (permalink) Old 02-10-2004, 08:09 PM
 
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honestly your stocks are like 138 and 140
im running like 122s jets

so your actually running richer then i am.
when i did my motor swap i used 94 motor. which has smaller
carbs then a f3 motor. only 2mm difference. im running f3 carbs on the f2
motor.
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post #5 of 14 (permalink) Old 02-10-2004, 08:25 PM Thread Starter
 
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so if i got the full exhaust i could stay how i am....or it would be too rich?
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post #6 of 14 (permalink) Old 02-10-2004, 08:34 PM
 
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you dont really need to jet it. but it will be flat in response. if my scanner was
working i would post my dyno sheet.

my power curve is idle to 2400rpms then flat to 2800rpms then a straight all the way up to 11,800 no dips

the flat spot is because of the low speed and high speed valve being permanlety adjusted slightly opened for the low speed adn fully opened for the high speed one.

these valves is the thing that is on the back of yoru airbox with all hose on it.
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post #7 of 14 (permalink) Old 02-10-2004, 08:36 PM Thread Starter
 
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that would be the three hoses with a filter looking object connected between then or youre talking about the power valves in the venturi of the carbs?
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post #8 of 14 (permalink) Old 02-10-2004, 08:50 PM
 
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you got it. the hoses run up to the front of the bike. they look
like deer whistles. one is for the low speed and the other is
high speed they run off your speedo. but since i dont have the
electric speedo anymore since a f2 motor doesnt have the
sensor for the speedo. the shop that tuned my bike had to
bypass my valves so the would stay where they are.
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post #9 of 14 (permalink) Old 02-10-2004, 09:09 PM Thread Starter
 
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ohhh now the mystery is laid to rest....i know what they are for now....so if i put the full exhaust the flat spot would be really noticeable? or would i have one at all?
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post #10 of 14 (permalink) Old 02-10-2004, 09:12 PM
 
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youll have power but not like it would with it being tuned for the system. you can ride with the pipe on depending on how much the pipe is for performance. and might be happy with it but for optomize performance youll need to have it properly jetted.
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