[Discussion] Technical - Exhaust Systems

[jamesgoh13]

Actually backfire is due to the tuning of carbs or carbs prob. Normally pple do it "manually" while riding. If nt will be the tuning went haywired liao dat the intake of petrol or wadever is too much liao dat y will caused the sound or backfire.

 

 

So far mine is a new bike too only 3 mths old & had already clear my meter couple of times. But hav nt met into any probs yet & definitely wud nt wan to face any probs too.

 

 

Might be during the assembly of ur bike b4 collection or ur riding style dat causes the tuning to be off. U might wan to check wif ur mechs & solved the probs b4 it worsens. Make sure u r there to supervise the mechs when they touches ur bike, cause u might nt knw wad they will do to repair ur bike.

 

 

Juz hav to be careful.

[duckit]

Check ur Plugs . And Super 4 tunnnin wont so easily off , moreover urs is still a brand new bike . No worries ...

[alfred84]

I have this problem too. Mine is a new spec III, around one month old. I thought the pop was okie cause it happens only when we start the bike and not when we are riding it.

[hilfiger]

Wa i didn't know so many spec3 riders have this prob...I also have this prob for my spec3 which is now clocking 20k km. Sometimes loud, sometimes soft.

 

Changed plugs - no diff. Never throttle before switching off bike. Could be carbs not perfectly synchronised.

[Guest 6.5rpm]

So i m not the only 1

 

I haf tis problem after i changed to aftermarket exhaust. No prob with my stock pipe. But happen once in the blue moon, so i guess is okay n cant be bother abt it

[HondaSP]

my spec 3 nv give me popping sound lehz ... how come u all got sia ..

 

my bike onli got a problem wid the clutch it will vibrate hard when it jus start moving , ard 80km/h then the sound not really able to hear ... every time i start n move off there be a sound like loose parts sian ...

 

still cant solve lehz haiz

[episode2]

hmmm...weird ar... izznt this meant when there are certain amount of fuel enters to ur firing chamber when u park..or unburn fuel deposited a small amount there..when ignite...a small back fire will occurs..think so think so...no worries...for 2strokes bike will have a CHOOOO sound when somtime try to kick start..or even piak..

[f3nG]

hey i've experienced the same prob. too !

but encountered it abt 3 times in 3 months?

mine is also a brand new bike

not sure what the prob. is too..

hmmz...

[Razgriz]

sorry.. i m a wave-i rider ar... but i oso hv tis prob.. i think so la cos is while riding.. but ... long long happen 1 time .. i oso wondering wad happen... but is FI model de... so .. does it hv carb in 1st place? .

 

srry.. educate mi yi xia...

[juhzac]

Phew, so i'm not the only one.... Seems like alot of new Spec 3 riders have this problem. But no worries bros, i'll get to the bottom of it.

 

episode2 & jamesgoh13 - Yup i agree with you guys, have to be the carburator and the fuel/firing chamber problem. I guess there is a build up of fuel unburnt somewhere and it builds up after a long period of time, for my case it's over 12hrs. Then when i start the bike, "POW!!!" If i start my bike estimate before 12hrs, won't have the pop sound.... funny right? haha. Anyway where is the caburator tuning knob for super 4 ah? Can't seem to find it, hidden somewhere inside. Won't touch it, just wanna know where it is.

 

As duckit says, check the plugs. Could be it also. Anyway i'm planning to change to NGK Iridiums soon. Which is better? Denso or NGK?

 

No worries Spec 3 riders, i'll check with the Boon Siew mechanics and see what they have to say.

 

 

[Sretroyl]

start checking the air filter first b4 going further

[bt]

my previous yamaha t110 cub also like this.

 

it happen when i was just enlisted to NS and i left my bike there for weeks and didnt touch it. but after tt it kinda went "BANG" when the engine brake is applied.

 

some points for you research.

[pufferfish_76]

my bikes is 15mths old liao ... clocking 36k km liao ..

 

the pop sound only came a few mths back .. think 4mths ba ...

 

thinks is time to service carbs ...

[s4vtec]

hi to all... my comments here... might be right or wrong but its just my 2 cents...

a few reasons to who your bike will back fire...

-wrong types of plugs used...

-spark plug cables o/c or loose

-carbs tuning out

-carbon stucked up in engine or carbs area

the above seems to be impossible to all as your guys are using new bikes. but maybe all new spec 3 s4 bikes have this problem due to its too new? i cant confirm on this as i'm riding a Hyper VTEC but i had this similar problem some 1 year plus ago which was then a 6 years old bike. mileage was about 80k and it did backfire when i was riding like 20km/hr moving off from a junction... had my plugs changed and it as ok...

anyone, comments pls... the above is my 2 cent only... no offence to anyone.

[kennethy]

that is something very interesting...

 

this never happened to my spec III before... maybe cos mine is the 05 version of spec III.

 

even had left my bike unriden for weeks and nothing happen (except a bit difficult to start)

 

just a check, did you guys blow the throttle just immediately before you off the engine... know alot of people actually like to do that... as that might be the cause of backfire...

[Lass]

Originally posted by 6.5rpm@Oct 25 2006, 11:03 PM

So i m not the only 1

 

I haf tis problem after i changed to aftermarket exhaust. No prob with my stock pipe. But happen once in the blue moon, so i guess is okay n cant be bother abt it

likewise nv had any problems w my stock. only my yoshi pops hehe but has lessen. doesn't bkfire on regular riding so much any more as well. hmm asked ppl b4 but they say it's nothing one, just accumulated carbon or something like tat, so far no problem w my 1 yr old spec 3

[Manzz]

maybe during those 12 hrs someone fiddled with ur throttle and twisted a few times.. so when ignite, ... "POP!" Congrats and welcome to the backfire club.

[anric79]

juhzac,,

 

Have u ask ur boonsiew mechanic, what did they say ? cos i also got this pop sound morning when start . this happen only after 1mth time for my new spec3 bike..

 

i wonder is it because we all still run in never go fast alway remain 80kmph , then fuel never burn properly still left inside chamber so next morning then gana this sound ??

[juhzac]

Originally posted by anric79@Nov 8 2006, 05:48 PM

juhzac,,

 

Have u ask ur boonsiew mechanic, what did they say ? cos i also got this pop sound morning when start . this happen only after 1mth time for my new spec3 bike..

 

i wonder is it because we all still run in never go fast alway remain 80kmph , then fuel never burn properly still left inside chamber so next morning then gana this sound ??

Hi anric79,

 

Ok i just did my 2nd servicing afew days ago. Asked the mechanic and he ruled out spark plugs. he said new bikes won't have problem with plugs as spark plugs can last at least 10000km, aside from the problem, he says that while riding if there is backfire or pop-pop sound, then it might be the plug faulty. he also ruled out the tuning for carburator for he says if i didn't touch the tuning, then it's not it cuz new bikes are all factory settings and very unlikely for new bike's carburator to 'run'. He says it's likely to be the build up of fuel in the exhaust. But he says it is harmless, it's just like a release due to buildup and pressure. He says if the problem still exist until my 3rd servicing, he'll take a closer look. Hope this helps, if your bike still under warranty and have 3 free servicing, go ask the mechanic in detail lor, hope they might be able to give a solid solution to solve this problem.

[f3nG]

alas

my free 2 servicing is up

but heard the pop sound again this morning..

hmm..

whats wrong man..

[anric79]

Hi Juhzac,

 

Thks for ur advice. after hearing what u say i feel much more relieved now, Very expensive leh this bike, only 1 mth then give me pop pop sound, alway feed him 98 petrol still like tat , haha.. I will consult my LOOIS mechanic thks..

[TangoBoy]

Hi all,

 

Just wondering is it possible to spray design our exhaust pipes, unless you using yoshi or micron ..etc etc...

I'm using stock end can wrapped with chrome plate. Tot of air brushing the plate to suit my bike design. Is it possible and where cud I do it?.

 

Thanks.

[Mussolini]

i've seen pple spray black/gold. if u gonna do airbrush, u might wanna consider again cos the endcan is hot. it might damage ur paintwork.

 

let's see what others wanna say

[ah786786]

If one to change or spray colors....must use very high temp paint quality....but not worth it....Nice exhaust might be icthy to "sum" eyes... risky..morning exhaut missing,,just my 2 cents tots....

 

But good luck .

[iqiem]

well...my end can is golden and white bike....

paint work wise...

3 months liao....still quite okay....

maybe what u might experience will be some small bubles...