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View Full Version : stock jetting with open lid and k/n


TRX450RKEN
04-24-2005, 10:10 AM
Anyone have any answers to the jetting of my stok trx 450r carb when i install a pro design filter kit?
i took off the air box lid and it sucks a lot more air....any ideas where to start?

thanks!
Airik79mx
04-24-2005, 10:24 AM
185 main, drop the clip on the needle or get the HRC needle
TRX450RKEN
04-24-2005, 01:11 PM
which way do i drop the clip towards the blunt end or the needle end?:macho
Airik79mx
04-24-2005, 02:04 PM
Down towards the needle, it raises the needle to allow more fuel threw the main jet
TRX450RKEN
04-24-2005, 02:15 PM
you think i have to change my slow jet from a 48 to a 50?
Airik79mx
04-24-2005, 02:43 PM
nop

-Stock Pilot-
-HRC needle-middle clip-
-185 Main jet-
-3 full turns out on screw-

That's what I had with my stock carb with a Pro Design, no lid, full pipe.
TRX450RKEN
04-24-2005, 03:23 PM
but if i have the stock needle jet its all the way down and i have a stock pipe will that make a diff? also three turn out on what screw?
Airik79mx
04-24-2005, 03:37 PM
Ya, the stock needle will work but you have to change the main. And it's the air/fuel mixture screw on the bottom of the carb.
TRX450RKEN
04-24-2005, 04:52 PM
WOW!!!! what a differnce its on the rear wheels in 1st second and third its like night and day....and ideas of hp gain? thanks again im real stoked now

ken
Airik79mx
04-24-2005, 05:06 PM
Cool, you probably gained about 2 HP with increased Torque too. Next throw on a full pipe to get that air out faster to and it will rev much quicker.;)
Airik79mx
04-24-2005, 05:07 PM
Then get a good drop-in cam and you'll really bring that motor to life:D
TRX450RKEN
04-24-2005, 05:28 PM
any ideas on cam and full pipe
combos?

thanks ken
Airik79mx
04-24-2005, 05:44 PM
For a pipe the Sparks pipe is good, Baldwin, White Brothers Carbon Pro, Roosier, HMF, etc.....

The cam depends on where you want your power. The HRC cam makes nice top end power but if you want a strong bottom/mid cam the Baldwin MX cam is nice. I had the HRC cam but changed to the Baldwin mx cam because I race mx and it fits my needs beter. On the other hand if your ripping in the dunes, drag racing, etc... the HRC might be for you. Alot of people seem to like the Hotcams stage 2 cam for the price but it feels flat to me.