Backfire

[Nate_450R]

now that its cold outside i have noticed a backfire after i let off the gas or downshift. the only thing done to the engine is an HP kit. and it wasnt doing it when it was warm. is there anything i can do? or is it just because the cold weather? im guessing it will stop when it warms back up?

[MR.BIG]

Adjust your fuel/air screw!

[danniheyj82888]

Originally posted by MR.BIG
Adjust your fuel/air screw!

Hey MR.Big, how do you like the power now? did you notice any performance difference?

[ghott]

Adjust your A/F Mixture screw out a 1/4 turn at a time. If you turn the A/F Mixture screw out a total of 3 turns (from all the way in), bump the pilot jet up one size, and put the mixture screw back at 2 turns out.

Then repeat if necessary the process with the larger pilot jet if necessary.

[MR.BIG]

Originally posted by danniheyj82888
Hey MR.Big, how do you like the power now? did you notice any performance difference?

I have the stock carb still and I did notice a little bit better throttle response.

[danniheyj82888]

Do you think it is worth the $100?

[ghott]

You guys referring to the powernow for carbs?

[MR.BIG]

My friend owns a quad shop so I got one for $75 so I think it is worth it. You will notice it.

[Elduner]

Originally posted by MR.BIG
My friend owns a quad shop so I got one for $75 so I think it is worth it. You will notice it.

Power Now is the biggest waste of money other than graphics..lol

there has been dyno's done just to prove it...

Dyno section (http://www.*******.net/forums/)

[MR.BIG]

Well obviously it isn't going to give you anymore horsepower it gives you better throttle response. That's it!

[ghott]

The powernow actually hinders performance on the top end significantly.

The colder the air the more gas you need cause more air you will be getting.

[cali42000000]

im still having problems with my 450 r i already changed the spark plug and air filter i cut the gas stem shorter and changed gas it still back fires and bogs out i even checked the carb need help

[ghott]

Originally posted by ghott
Adjust your A/F Mixture screw out a 1/4 turn at a time. If you turn the A/F Mixture screw out a total of 3 turns (from all the way in), bump the pilot jet up one size, and put the mixture screw back at 2 turns out.

Then repeat if necessary the process with the larger pilot jet if necessary.

....

[cali42000000]

Originally posted by cali42000000
im still having problems with my 450 r i already changed the spark plug and air filter i cut the gas stem shorter and changed gas it still back fires and bogs out i even checked the carb need help i just ordered a jet kit where should start for jetting if i only have a k&n filter need help

[cali42000000]

hey about to purchase some hyper rims does anybody now how good r these rims are in all terrain do they crack. need help thks

[spincr4hire]

Originally posted by cali42000000
hey about to purchase some hyper rims does anybody now how good r these rims are in all terrain do they crack. need help thks

best rims out, period. If you do crack one they will replace no questions asked, but its rare to crack or break one.

[cali42000000]

thks dude going for it

[400exrider99]

check your valve lash

[cali42000000]

when riding my 450 r my pipe glows i have a full exaust lrd they tell me its running lean i have 180 main jet and air lid off with k&n filter 2.5 turns out

[esr250r86]

yeah, I would say your running lean but?