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gots me a 450
alright i have a 400ex with a lrd full system and a stock carb bored to 38 or 39. my main jet is 170 my i lowered the clip one and i left the pilot at what its at. every time im on the gas and let go it back fires. any suggestions. im going to try and play around with it a little more but what does backfiring mean? any help would be appriciated thank you.
2004 Honda 450R, +4 lonstar, ss front lines, nerfs, +2 LT housers, longtravel Pep big bottle comp and reb adj. triple rate shocks with rezzies and clamp.. , 13:1 compression piston, hrc cam,full belly ac skid plate. 8x8 beads with mxr's powdercoated red with black ring, Kumho radials on powdercoated red rims. lots more pc'd items. renthal fatbars, stealth black powdercoated frame, and guesseted, also powdercoated fire red clutch cover and valve cover,,
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www.sponsorhouse.com/Members/quader400
ECPerformance
It's your set srew. Play with that . If that doesn't work change the pilot jet to a 42. That sould clear the problem.
ECPerformance 450R
E-mail: trx500ex@hotmail.com
C&D Racing
just put the 42 pilot in the carb and be done with it.
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Registered User
your lean on your fuel skrew. you can try to turn it out a little bit or just get a new pilot. my built engine is acting wierd. actually, many others told me theirs does this too. i have a 42 pilot jet in and its pretty rich at idle. i have to leave my fuel skrew at only 1 turn out to get a air/fuel ratio at idle. i may go down to a 40 if i have any other problems.
2005 450r
*sold* 2001 400ex
"If you think you can, you can. If you think you can't, your right."
"A leader will take you where you want to go. A great leader will not necessarily take you where you want to go but where you ought to be."
"If you want to do something, you will find a way; if you don't, you'll find and excuse!"
"Its not aptitude but attitude that determines your altitude."
Member
It may also be a leak in your exhaust system....when you just start it up and when its COLD, hold your hand over the end and listen for any "puffing" sounds
Senior Member
Its not the exhaust leaking, I was running no header gasket and it didnt back fire, he is running lean down low. And I wouldnt hold your hand over the end of the exhaustOriginally posted by whatwasthat
It may also be a leak in your exhaust system....when you just start it up and when its COLD, hold your hand over the end and listen for any "puffing" sounds. Basically what it happening is you are going from posssibly running rich in the mid to top, but when you let off you go into your low fairly quick and it starts to get lean from the pilot screw. Up it to a 42. My brothers was having this problem and I kept wanting to go down on the pilot, but then my buddy told me to go up 2 sizes and it deosnt backfire anymore and starts way easier.
gots me a 450
sorry one more thing i looked and there already is a 42 pilot in there. so should i get an even bigger pilot or what should i do. and i changed the maind to a 165.
2004 Honda 450R, +4 lonstar, ss front lines, nerfs, +2 LT housers, longtravel Pep big bottle comp and reb adj. triple rate shocks with rezzies and clamp.. , 13:1 compression piston, hrc cam,full belly ac skid plate. 8x8 beads with mxr's powdercoated red with black ring, Kumho radials on powdercoated red rims. lots more pc'd items. renthal fatbars, stealth black powdercoated frame, and guesseted, also powdercoated fire red clutch cover and valve cover,,
http://atvnews.s4.bizhat.com/index.php?mforum=atvnews
www.sponsorhouse.com/Members/quader400
gots me a 450
what is the set screw. i played around with the one screw that is behind the idle screw and now my quad idles really really high and i dont know what to do. im going to take it in soon if i dont figure it out so any help would be greatly appriciated. thank you.
2004 Honda 450R, +4 lonstar, ss front lines, nerfs, +2 LT housers, longtravel Pep big bottle comp and reb adj. triple rate shocks with rezzies and clamp.. , 13:1 compression piston, hrc cam,full belly ac skid plate. 8x8 beads with mxr's powdercoated red with black ring, Kumho radials on powdercoated red rims. lots more pc'd items. renthal fatbars, stealth black powdercoated frame, and guesseted, also powdercoated fire red clutch cover and valve cover,,
http://atvnews.s4.bizhat.com/index.php?mforum=atvnews
www.sponsorhouse.com/Members/quader400
Senior Member
The 42 pilot should be fine, I has to up my pilt 2 sizes when winter cam around, but a 42 should be plenty for you, I dont have stock carb so I dont know where the fuel screw is, but I would back the fuel screw about 1/2 turn or so.
Registered User
i am betting you just fouled the plug. try turning the fuel skrew 2 turns out from lightly seated. take the plug off and clean it or put a new one in. make sure your fuel is on and just hit the start button without hitting the gas.
2005 450r
*sold* 2001 400ex
"If you think you can, you can. If you think you can't, your right."
"A leader will take you where you want to go. A great leader will not necessarily take you where you want to go but where you ought to be."
"If you want to do something, you will find a way; if you don't, you'll find and excuse!"
"Its not aptitude but attitude that determines your altitude."
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