View Full Version : power increase and jetting question
07250ex
03-28-2009, 04:05 PM
I just bought a hmf sport series and a k&n air filter when i rejet how much of a power gain should i notice with these ? also what should i rejet to if i run airbox lid off k&n with outerwears and a hmf with quiet core ... also what should it be jetted to without the quiet core?
dirtdawg
03-29-2009, 09:22 AM
in the performance thread it says 110. i run a 102 with a twinair filter and hmf full but not the quiet core. i putting a k&n in soon w/ outerwears so i'll let you know what i come up with to help you out.
hondariderdylan
03-29-2009, 06:49 PM
yea
read the first thread on here
then if it doesnt answer your question, post a thread
but i dont think it gives horsepower #'s
not sure maybe 20-25?
86250rrider
03-29-2009, 07:32 PM
Originally posted by hondariderdylan
yea
read the first thread on here
then if it doesnt answer your question, post a thread
but i dont think it gives horsepower #'s
not sure maybe 20-25?
maybe 20 TOPS...........these are no firebreathers here ! but still fun
hondariderdylan
03-29-2009, 07:51 PM
i figured 25 if he added all the stuff people normally get along with exhuast
jets
filter
rev box maybe
etc.
the motor already puts down 17 horses
not sure
wish i had a dyno in my back yard:p
Originally posted by hondariderdylan
i figured 25 if he added all the stuff people normally get along with exhuast
jets
filter
rev box maybe
etc.
the motor already puts down 17 horses
not sure
wish i had a dyno in my back yard:p
That must take a huge bore to get a 250ex to 25HP. Dont think you realize a stock 400ex puts down 27HP and it would beat any modded 250ex motor. Not trying to put it down just throwing around some facts.
07250ex
03-30-2009, 05:32 PM
Originally posted by hondariderdylan
i figured 25 if he added all the stuff people normally get along with exhuast
jets
filter
rev box maybe
etc.
the motor already puts down 17 horses
not sure
wish i had a dyno in my back yard:p
you'd have trouble getting me to believe a 250ex puts out 17 without a dyno ... yes i know the sticky at the top exists also anyone with hmfs is it truely necessary to rejet if ur switching to quiet core or removing the quiet core?
hondariderdylan
03-30-2009, 06:14 PM
Originally posted by 07250ex
you'd have trouble getting me to believe a 250ex puts out 17 without a dyno ... yes i know the sticky at the top exists also anyone with hmfs is it truely necessary to rejet if ur switching to quiet core or removing the quiet core?
true
i was overstating when i said 25, my bad
the sticker on the front of the 250's frame has net HP #'s and its 16.8
look for your self
07250ex
03-30-2009, 06:20 PM
Originally posted by hondariderdylan
true
i was overstating when i said 25, my bad
the sticker on the front of the 250's frame has net HP #'s and its 16.8
look for your self
wow i honestly never knew that ... you dont happen to know what the 300ex pushes out do you?
hondariderdylan
03-30-2009, 06:24 PM
yep, its pretty cool
no but i can find out
i will post up in a minute
hold on
hondariderdylan
03-30-2009, 06:30 PM
well heres a shocker:
250EX:16.8 Hp
300EX:17-18Hp
wow
big jump.......:eek2:
07250ex
03-30-2009, 06:42 PM
Originally posted by hondariderdylan
well heres a shocker:
250EX:16.8 Hp
300EX:17-18Hp
wow
big jump.......:eek2:
yeah how do you find all this out i would love to get my hands on a link to a website with such knowledge ... and man im tellin ya if they would cut out this shaft drive **** our 250s would be damn near equal the 300 (even though it pretty much is) with all the weight it would save.
hondariderdylan
03-30-2009, 06:48 PM
you just took the words from me
i hate the driveshaft even though you dont ever have to worry about it
thats the 2 things i dont like about it, weight and shaft
oh yea, i just typed in "300ex stock horsepower" on google and the first 2 results said 17-18:)
17HP on a 250ex might be at the crank. 300ex being 17-18 sounds more like at the wheels. Its a bigger motor and all.
hondariderdylan
03-31-2009, 12:33 PM
Originally posted by FlewByU352
17HP on a 250ex might be at the crank. 300ex being 17-18 sounds more like at the wheels. Its a bigger motor and all.
either way, they arent firebreathers but i expected a bit of a jump besides 1 or 2 hp
crank or back tires
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