What is the leading cause of backfire when I engine brake (decelerate)??? I'm talking about a 350x with stock motor, carb, and exhaust. The muffler has the small plate removed from the back. Could that cause it?
Just Too Addicted
Arm chair racerJust too addicted
What is the leading cause of backfire when I engine brake (decelerate)??? I'm talking about a 350x with stock motor, carb, and exhaust. The muffler has the small plate removed from the back. Could that cause it?
Honda
86 350X - Full Restomod
85 250R - Legend
85 Big Red - Clean Original
85 Big Red - Custom
Not Honda
85 Yam Badger 80 - Kids
99 Pol Sport 400 - Got it FREE
At The Back Of The Pack
Arm chair racerAt the back of the pack
well i heard somewere that timing has a big thing to do with it. but i dont know much bout honda.
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Just Too Addicted
Arm chair racerJust too addicted
The timing can cause it to backfire. If you have a manual it will explain exactly how to check timing.
Power User
Teaching quads a lesson
running rich and valve overlap also causes backfiring. i dont know about a 350x but it could be perfeclty normal. it is normal on some engines. **edited by moderator**
**Warning - You know better than to bait someone into an argument.
Power User
Teaching quads a lesson
LOL, he self proclaimed it, that is not baiting, it is just repeating his words!!!
there was no cussing, no name calling, and no lying, i think you need to relax a tad and have some fun.
Banned
The day begins with 3WW
Im not into loopholes and technicalities, so please dont quote the rules to me. You are trying to start a fight, plain and simple. If you want to "have fun" with somebody, selecting someone who you obviously have a problem with, and who obviously has a problem with you is not a good idea, and your intentions are obvious. You wanna fight, do it in private.Originally Posted by 200x Basket
LOL, he self proclaimed it, that is not baiting, it is just repeating his words!!!
there was no cussing, no name calling, and no lying, i think you need to relax a tad and have some fun.
Got The Holeshot
Just too addicted
backfiring is caused by excesive unspent fuel that builds up in the exhaust and gets ignited. stock 350X's are jetted rich and are known to backfire when decelerating. anotherwords its normal.
Tim, i have no problem with basket. or anyone else.
At The Back Of The Pack
Arm chair racerAt the back of the pack
Another sort of noise when decellerating can be caused by the mixture being a bit on the lean side, it is heard as a soft popping, not bangs and is also caused by air leaks in the exhaust system, usually on cars, but sometimes heard on bikes.
Nat
1979 Suzuki TS100
1984 ATC70, Broke
1984 ATC110, Repainted and Rebored.
1990 Suzuki SJ410
Unsuspended Antics.
First Time Rider
Arm chair racerNew to the board
Not to argue or disagree with anyone, but I thought a lean mix would make an engine backfire too, That's why some carbs have an air cutoff valve. When the engine suddennly decelerates the mix becomes lean, which can cause popping and backfiring, then an air cutoff valve shuts-off some air flow to make it temporarily rich to stop that. Now I'm not saying i'm right and i know nothing about the machine at hand, just kinda puttin in my 2-cents.
Power User
Catch me if you can
Call me a crack head.... But after putting on a COBRA pipe - 250SX it backfired like nuts, especially after a hard run. It was lean and I tossed in a 350X #138 main and it still popped but had better top end. I turned out the air screw 1/2 turn and the deceleration backfire stopped almost completely - yet were all told the air screw on affects idle to 1/4 throttle? :? Why was that?
Registered User
New to the board
Kris,
knowone seemed to touch on the basics.
#1 Fouled or improperly gaped spark plug
#2 Improper ignition timing
#3 Improper Carb main jet selection
#4 Weak ignition coil, CDI unit or Pulser generator
#5 Obstructed fuel line or shut off valve
#5 Improper ignition advancer unit
#6 Clogged fuel cap vent or fuel filter
process of elemination...good luck! :-D
Power User
Teaching quads a lesson
Someone copied their Clymer .....
J. Jonny D, --- Quad - Trike relations committee Chairman and all around swell guy.
Rides: '91 Warrior, '87 TW200, 1984 YTM225DX, 1984 ATC125M, '71 CL350 Scrambler
Registered User
New to the board
I did that all from memory.... :shock: ...LOL
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