450 not starting good

[jaywoodsrider]

Well ever since it got cold my 450 hasn't been starting very well. It takes about 10 kicks for it to do anything and then it will backfire a couple more kicks and then finally start. Anybody else have starting problems. I put i drd pipe on it and haven't changed the jets because they told be that i didn't need to. I think they should be changed and i don't know what size i should go with. Can anybody help me?

[quadrcr161]

its the jetting, and yes they need changed anytime you mod the intake or exhaust you need to change it. take it to a shop and they can get it done for you.

[400exrider707]

even if you didn't put the pipe on its starting to get colder out now and the air is getting denser so rejetting for the winter would be a good idea. Now that you haven't jetted for the pipe and its cold out, its twice as noticeable

[sulnz450r]

First do a plug check and see where you are at . Did the pipe come with some jets ?? Just to give you a reference, I have a white bro. slip on and a ehs lid ( gets alot of air ) and I am running a 180 main with a needle jet that I got from a hop up jet kit. needle jet is in 3 rd clip. I believe it is 2 and a half turns on the air screw and it runs great. Got down to 15 degrees here tonight. Hope this will help !:)

[jaywoodsrider]

Does anydody have just a slip on pipe on your 450 with the stock filter and air box. I'm curious what i need to change my jet to.

[spindles]

well you need to change your jetting up regardless, but that will not affect your starting problem. I am from canada and we are probably 20 degrees colder than you right now. what works for me is first make sure your headlights are off. on start up they rob a lot of power from the stator and believe me it really helps to have them off. next , pump your throttle 3-4 times to give it some fuel. do not give it any while kicking (only before) choke of course and should fire. do this a couple of times if ness. its soo cold here that through the site glass on the side my oil dont even move for a couple of minutes but it starts fine. jetting only affects 3/8 throttle and more not idle or start. the spark is definatly stronger w/lights out

[rowlrag]

Originally posted by jaywoodsrider
Does anydody have just a slip on pipe on your 450 with the stock filter and air box. I'm curious what i need to change my jet to.
Stock box, lid and slip-on=stock jetting.
I work on 5 450r's and run stock jetting on all with lids and slip-ons and full systems, HRC motors run the HRC needle there main=185, and a 52 pilot.
Blip the throttle a once or twice , then see if it starts better.

[Hammer trx450r]

Originally posted by rowlrag
Stock box, lid and slip-on=stock jetting.
I work on 5 450r's and run stock jetting on all with lids and slip-ons and full systems, HRC motors run the HRC needle there main=185, and a 52 pilot.
Blip the throttle a once or twice , then see if it starts better.

My HRC didn't come with a diferent pilot. Is this the reason why it keeps stalling when i give it alttile blip of throttle in gear?

[rowlrag]

Originally posted by Hammer trx450r
My HRC didn't come with a diferent pilot. Is this the reason why it keeps stalling when i give it alttile blip of throttle in gear?
Possible, HRC uses stock pilot, and it was too lean so i went 52.

[Hammer trx450r]

Originally posted by rowlrag
Possible, HRC uses stock pilot, and it was too lean so i went 52.

Could u explain what it was doing that made u think it was too lean? Mine is playing mind games with me:mad:

i tried putting the needle all the way up and it didnt help. Im also running TC full exaust

[Z-135]

Jaywoodsrider you need to run a 124 main jet with a slip on!

[Jersey450R]

Originally posted by Z-135
Jaywoodsrider you need to run a 124 main jet with a slip on!
I have just a slip-on and ran a 125 when it was warm, but the past 2 weeks i've been stalling occasionally so i just upped to a 130...problem fixed.
Question...If i switch to a uni filter from stock with a closed box, do you think i would have to re-jet?
...And can i run an outerwear with a uni-filter? I'm thinking about a HRC lid. thanks.

[Z-135]

There is no need to run outerwear with a foam filter. With the HRC lid my GUess on the main jet would be a 175 or somewhere closes.

[Jersey450R]

yea i know but the uni filter isnt exactly foam, it has foam underneath, but the outside of it is that other kind of stuff, lol.

[Z-135]

I run a 155 main jet with a 2" hole in the back of the air box. I have a full exhaust.

[jaywoodsrider]

Thanks spindles, i pumped the throttle 3 times and it fired right up. z-135, thanks for the input on the jets, i'm gonna switch to a 124 and see if it runs better.

[rowlrag]

Originally posted by Hammer trx450r
Could u explain what it was doing that made u think it was too lean? Mine is playing mind games with me:mad:

i tried putting the needle all the way up and it didnt help. Im also running TC full exaust
GT-Thunder dyno runs:D