sparks jetting?

[Hammer trx450r]

hey i have to do a jet kit for my buddies quad anyone do it and have any usefull info on it? air screw settings?

[tkwarrior]

What is getting changed?

[Blown 331]

Buddy of mine has an HRC kit with a Sparks and he is running a 190 main and a 62 pilet. Runs great. The pilet change got ride of the poping while letting off.

[Hammer trx450r]

He put the pipe on and never jetted it and now it is breaking up under load even with stock pipe on it

[Hammer trx450r]

i would just like to familiarize myself with it before he brings it over

[Pappy]

if he is running a stock filter and lid, id start with a 125or 135 main and 2 1/2 out on the airscrew (might be a bit different depending on what sparks say's) and no hrc kit

if he has the hrc kit and no lid then 170 or 180 on the main and see how she does

[Hammer trx450r]

Originally posted by Pappy
if he is running a stock filter and lid, id start with a 125or 135 main and 2 1/2 out on the airscrew (might be a bit different depending on what sparks say's) and no hrc kit

if he has the hrc kit and no lid then 170 or 180 on the main and see how she does

Excelent pappy, thats just what i was looking for;) is that what u have on your 450r?

[Pappy]

i have the ballance hmf carbon pipe, lid on and stock jetting. its been running fine. i tried a 135 main and it was way too fat.


today, at the mx track, my quad started braking down under WOT. i cant figure it out tho, it acted like it was just dying, id let off the gas and sometimes she would bark back to life, others she would spiiter sputter. i checked everything and didnt find anything wrong at all.

when i got home, i ran the hell outta it on my track and it didnt miss a beat:confused: the only thing i did at the track was to remove the gas tank and remove the twist throttle and reinstall the thumb. i checked for pinched lines etc but found none:( so who knows:)

[Hammer trx450r]

wow it sounds like my buddies bike. what is the stock jet size?

[Pappy]

stock is 118

[Hammer trx450r]

Hey pappy have you heard anything on the TC pipe? I was told its the pipe to go with by pretty good source.

[Pappy]

i geuss for max power they probably are the ones to beat....however the noise they produce is insane:p and seeing how the ama is now applying the noise sanctions on the mx crowd, id say tc's current design will be used only by local riders because i cant see how they would ever meet the required DB levels

[911]

just some info i put on an fmf sil and mid and opend the air box with 3 1in holes. i changed my main to a 170 and moved the clip on th needle all the way up. it runs great!!!!!! Papy yours sounds like mine when it was too lean...... it would just shut off at WOT..... good luck:)

[Parrella450]

wat u think i should run in my bike? i got full sparks pipe...K&N proflo kit with billet adapter...no airbox lid...i was thinkin around 190 mainjet...that sound about right?

[twisted threads]

Originally posted by Parrella450
wat u think i should run in my bike? i got full sparks pipe...K&N proflo kit with billet adapter...no airbox lid...i was thinkin around 190 mainjet...that sound about right?

I think your in the area you should be maybe a little high. But try it and see how she runs then start going down. My buddy has the same set up as you and he is running a 180 main.

[RedRacer44]

I have a full Sparks system with Sparks Filter kit and no lid. Sparks told me to use a 190 main and 2 turns OUT on the air/fuel screw....quad runs great. I used the same jetting specs on my cousins 450R last night and it runs strong as well. No back-firing or anything....

Just my 2 cents!

[400exBro]

Bump...
i thought i would just add on here instead of making a new thread...

I just got my Sparks exhuast and his supercharger kit for the 450r and was wondering what jetting to run with an open air box lid?? I am about 950-1000 feet above sea level, i also plan on running the HRC needle, if someone could give me pall park figures that i could work with would be great.
thanks