Friday, 16 September 2011

What causes Carburetor motorcycle engine to backfire on start-up?

Bike: 2007 Hyosung GT650R (Stock, still original parts except normal service replacements oil and filter and adjustments)



My bike has backfired on me three times now since its last service in Sept. twice in october 2 weeks apart and just last week. I have not taken it back to the mechanic yet as it鈥檚 not happening all the time, and I'd like to give some direction on the problem.



The engine is a 90 degree V-twin, with Carburetors. The mechanic adjusted the fuel mixture since he said the bike was running lean. Don't know if that's relevant or not. Prior to the last service, the bike never backfired. each time, it occurred during stat-up. either just as i press the starter button, or it cranked once and then backfired.



I looked on the internet, and other people have had similar comments, but they say it's normal or not a big deal. Needless to say, when my bike goes bang like a gun, it concerns me greatly. Other people didn't mention having this happen, but the tail light bulb was broken twice from the shock.



The weather was not cold (not below 30 F) but wasn鈥檛 really warm either (not above 50 F). Always start the bike with at least 戮 choke, and in neutral.



So basically, any idea what the cause could be, and recommend how to fix it (beside sell it)?



Also, don鈥檛 know if this is related or not. There is a hose between the rear shock and kickstand that I noticed has a liquid dripping slowly out during idling. Revving does not change the rate of drip. But it smells like gasoline. Don鈥檛 know where the hose originates yet. But if this helps of you know what this hose it, please let me know.



Any help will be greatly appreciated.
What causes Carburetor motorcycle engine to backfire on start-up?
Mine will backfire if I give it too much choke. Try a little less choke, increasing as you start if needed.

Could be the timing, also.

The hose dripping liquid that smells like gas most likely is an overflow from the carburetor. Probably a float needle not seating properly. Very well could have happened if the mechanic was in the float bowl of the carb. Would also contribute to an over rich condition, flooding carb, possibly the cause of your backfire.
What causes Carburetor motorcycle engine to backfire on start-up?
backfire usually indicate fuel mixture being incorrect. you stated the bike shop adjusted the carbs then = backfire. have them readjust the carbs since you paid for good service not a backfire services..hehehe.



those hoses you see are overflow for carbs. any unused fuel get dump out using those hoses.
Too much advance on timing and excessively rich fuel mixture. Or too tightly adjusted exhaust valve (most likely not on a new bike), causes excess intake reversion and back fires. Rev it quickly and see if you get a black cloud (rich).

Bought a 2nd hand LML NV-Spl (150 cc vespa).........Need Advice Please?

Hi all,



this is Sami from Bangladesh. I am a two wheeler fan (mainly motorcycles...have 1, will buy more soon) and bought a LmL NV last month. initially it was just to collect. however, the scooter is serving me in many ways lately. its a second hand one and its a 1987 model. 20 years of age !!



1st let me share the condition of my scooter.

%26gt;well its 20 year old

%26gt;none of the indicator lights or horn work. none of the switches work. The head light and the tail light have direct connection. Its kind of funny... when I go out at night, I pop a male-port in a female-port ( created by a claver mechanic).. Then both the head and tail light blows up...............!! however, the headlight is poor (any suggestions ?)

%26gt;the front breaks didn鈥檛 use to work. (Got it corrected last week).



Now there are few things I would like to share:



1. The scooter has amazing pickup. its really good.... even after 20 yrs



2. Its a fuel hungry machine.....(too bad) my one goes only 25-30/ liter.



3. The scooter is not very well balanced. the right side is far more heavier than the left side and the scooter tends to shift to right side of the road if you do not have previous experience. (Probably scooters that have engine on one side are less balanced).



4. If I apply-break to the front wheels while running, the scooter tends to shift right...!! Got no idea why. (Please suggest if you can)



5. i went up to 80kmph with this scooter..........it was so great. BUT wait...suddenly the engine sized at 80kmph speed!!! My rear wheels skidded badly... however, I clutched just at the right time... the rear wheel got freed up form the engine and slowly came to a halt. then I tried to start the scooter....it did start, but couldn鈥檛 go far..... It stopped again. I went to a workshop. There they said that my Fuel-Oil (2 stroke) mixture was not proper. I used too little oil while taking fuel and the piston almost seized.

I was lucky that time. The mechanic poured 2stroke oil directly in to the carburetor while running the engine high.



However, here in Bangladesh no one could tell me the right ration on fuel oil mixture.........( scooters are not at all popular here. 95% of the 2 wheelers are bikez)....Please advice if u can.



That鈥檚 all about my scooter...





But I need your help...........please advice me on a few things...



1. How can i make my scooter more fuel efficient ? (piston change ? carburetor change ?)



2. I am planning to install horns and indicator light. my mechanic told me he can do it without a battery or rectifier by a direct connection.... (should i take his advice ? dose LmL NV (ks) normally have battery ?



3. What is the oil-fuel mix ratio ? please provide a reasonable measurement.



4. How do I improve the head-light quality? Bulb change?



5. Is there any way to improve balance ? (My one doesn鈥檛 have the spare wheels. is it affecting?)



6. It takes a lot of energy to start the scooter in the morning.. 15-20 kicks. This is really painful. Please advice what can i do to get rid of this problem.....any simply solution?



7. Please provide ANY additional tips and info.............



*had to type fast. Pleases forgive the spelling errors..............



You can send your answers to



samihasib@gmail.com



or,



samihasib@yahoo.com



I am eagerly waiting for your advice and help.



Thank You.
Bought a 2nd hand LML NV-Spl (150 cc vespa).........Need Advice Please?
Your problems appears to be big but just to tell u that these kinda problems are very common in LML NV Spl. I would try to give the answers to your questions accordingly.



1) To make your scooter more fuel efficient u must need to change the carb with a brand new one as u bought a scooter which is 20 yrs old and people in India and Bangladesh never even think to change the carbs. So the carb which u have in your scooter must be 20 yrs old. Also check the piston and ring of the scooter with a good mechanic as it might be possible that the scooter has never been overhauled in last 20 yrs. If needed change both of them. Ask the mechanic to check the fuel tank also and if needed asked him to clean the tank internally.



2) This 20 yrs old scooter never had a batter ever, so there is no need to put a battery. Yur mechanic is right as he said that he can make all the lights and horn work without a battery. Go with the advice of your mechanic and if possible ask him to change the whole wiring of the electricals in your scooter with a new one. It will work perfectly.



3) The oil-fuel mix ratio should be 100:2, It means that if u r taking 1 ltr of petrol then 2% of that should be the 2T. So in 1 ltr the 2T should be 20-25 ml, not more than that otherwise your scooter will start emitting white smoke.



4) U can try using the halogen bulb available for the new LML's however its not recommended as u must need an alternator to enhance the power for it. The best option would be to use a new regular bulb and changing the headlamp's reflector and the glass with a new one. It should work perfectly and the light's intensity can be doubled doing this.



5) If u dont have a spare wheel then try to get a new one installed there. It will surely help to maintain the balance greatly. Also, do check the rear wheel's rim for any malfunction. If it is bended or has any cracks on it then change it immediately with a new one. Also do check both of the tires. If they are old ones with no treads on them then do change them also.



6) Try using choke always after changing the carburettor. It should not take that many kicks to start. Also u can try tilting your scooter a bit on the right side for 15-20 seconds after opening the fuel. Then try to start it, it will start in 2 kicks for sure. This process can sound funny to many people but its a big reality for all the LML scooters. By doing this a rich mixture of fuel and air will go in the piston. Finally, check the spark plug and change it with a new one if u have'nt changed it after buying the scooter.



At last I would like to say that never try to apply front brakes directly while riding your scooter at high speeds. It will never work perfectly and the scooter can easily skid. Always apply the rear brakes first then if needed, apply the front brakes. It will provide u a better stopping st high speeds and the scooter will maintain the straight line.



One more suggestion for u...Ask your mechanic to check the rear and front shockers and if needed then change them with a new pair as they must be 20 years old now. It will not cost u much as the shockers come real cheap.



Remember that the scooter u have purchased is the sturdiest scooter ever made in India by LML after Lambretta. It will serve u 20 more years beutifully if u take just little care of it. Do not try to push this scooter to its limits. Handle it with ease and try to enjoy the ride....

My tail lights keep going out. why do they keep burning out?

I have an acura and i keep having to buy new bulbs. I changed one, then the other went out, so i decided to change them both, then a few months later, they went out again, both at the same time. why do they keep going out? how should i fix it, or do i just need to keep buying more bulbs every few months....
My tail lights keep going out. why do they keep burning out?
Be glad you are at least getting a few months wear before they burn out. My Chevy Camaro was eating bulbs daily last spring.



My husband never did learn what was causing it. He suspected a broken wire causing a short but couldn't find it. Tracing an electrical wiring problem is right up there with searching for a needle in a haystack.



Here are some of the things we tried. Maybe one of them will help you.



1. Check the brand bulb you are using. If it happens most often with one brand over another, stick with the brand with the longest lifespan.



2. Check the light sockets. Are they clean? Do they have any loose wires connecting them to the wire to the battery?



3. Get a wiring diagram (Haynes Repair Manuals and some Chiltons have them. Check for the diagrams before you check out the book from the library or buy it at the parts house.) Trace the lighting wires back to their source and check every section for breaks.



4. Does weather affect the light going out? Do they go out after a rain or when it's really wet? There may be water splashing or dripping somewhere that's causing a short.



5. If none of these apply, look for patterns (like the rain or the brand of bulb) that might be related to the problem. Experiment with changing that variable to see if it makes a difference.



Good luck.
My tail lights keep going out. why do they keep burning out?
Believe it or not, it is VERY common for bulbs to burn out close in time if they were replaced at the same time. The reason is that quality control for bulbs of all types(auto or home) is very good at the manufacturing level. There are also some other factors that COULD be affecting your situation.

On any car the electrical system CAN be the hardest to diagnose unless you have a lot of training or are just lucky.

Have a trained pro look at your system.
The main reason: Brands of light bulb used, do not use the Chinese crap.

Shorts in the electric circuit do not blow bulbs - they blow fuses -

The only way to blow a bulb is to put more volts than what is designed for.
Have the voltage output of you alternator checked with it on the car and running. If the voltage is high bulb life will be shortened considerably. Leaks in the tail lights letting water enter is a common problem. Not from shorting but sudden temp change when the water hits the hot glass.



A short will not cause this problem even though others have mentioned that.



Always use name brand quality bulbs, avoid fingerprints on the glass and get LL (long life) bulbs. Make sure the bulb number you are using is correct. Many bulbs look similar and fit the socket yet are incorrect.
The only reason they would burn out so quickly is that there's a short circuit in your electrical system somewhere.



Tracing shorts is hard, and for someone to do it it's pricey. If you're good with electricity and electronics, you might be able to find the problem, otherwise, you're going to go through a lot of light bulbs.
could be that you are using a higher voltage bulb than your fuse can handle and it is causing you to blow your lights so to speak, double check your bulbs, and try changing the fuse out. The simple things are usually the problem on something like that and its pretty cheap to fix as well. Also make sure that you have no cracks and a good seal at the taillights, water (rain, etc..) can really have an effect on that as well. After all that, then its time to check your wiring, for corrosion, rust, broken, etc...
Try driving an American car!
It may be because your car is lowered to the point where it shocks the bulbs excessively, or perhaps your boombox in the trunk is causing too much vibration than the bulb can handle. The long life bulbs could be the answer in these scenarios.

Shorts don't blow out bulbs. Check the grounds back there at the taillamps. A loose ground(a long) could cause them to appear as if they burned out and also make them act strange when you step on the brake at night.
sounds like water is getting in the lenses, or a coroded wire.
try adding an extra ground wire from your metal part of the light frame to the body of the car, poor grounds make a puzzling problem
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  • How do I remove the tail light from a 2004 Cavalier?

    I own a 2004 Chevy Cavalier and I need to replace the rear Driver side turn light, but for some reason I am unable to get the bulb loose. Any ideas as to how I can get the bulb loose so I can change the bulb without any damage occuring?
    How do I remove the tail light from a 2004 Cavalier?
    pull out the socket and twist the bulb out, if it won't come out apparently it has gotten water in there and rusted and if you can't get it out you will have to clip the wires off and get a new socket at the dealer or junk yard.
    How do I remove the tail light from a 2004 Cavalier?
    yea..you have to pull the lamp assembly out 3 10mm nuts..for some reason they didnt leave enough room to twist the socket out
    OPEN THE TRUNK REMOVE CARPET AROUND LIGHT THEN REMOVE THE LIGHT ASSEMBLY THEN YOU SHOULD BE ABLE TO REMOVE THE BULB

    3 series bmw all tail lights out how to fix?

    My right tail light has been out for 2 years, changed the bulbs and even got new lights. However, the right light was still out had it fixed with new wire, worked fine. Turned the check engine light off and now none of the tail lights work at all, its not the fuse and and there is no power connecting to the break lights. Please help!!!!! Can not pass inspection or legally drive now :(
    3 series bmw all tail lights out how to fix?
    Bad headlight switch if the wiiring isn't broke.

    How do I use a multimeter tester to find a problem with my brake lights?

    My tail lights work and when i hit the brakes the samb bulb should light up brigher. When i hit the brake they dont light up brighter. I changed the bulbs and I still dont seem to get rid of my problem. Somone told me to use a multimeter tester to solve my problem. What do i have to do with it to solve it?
    How do I use a multimeter tester to find a problem with my brake lights?
    First check your brake light fuse!

    The black wire should be grounded,have someone depress the brake pedal.with the tail light bulb out of socket, test both contact inside the socket.if you have your park light on ,both contacts should be energized.if only one works then you have to decide which one by eliminating the tail lights.



    %26quot;BRILLIANT%26quot;!!!!

    Thursday, 15 September 2011

    Reindeer Jokes..............?

    What do reindeer hang on their Christmas trees?



    Horn-aments!





    What would a reindeer do if it lost its tail?



    go to a re-tail shop for a new one!





    Why is Prancer always wet?



    Because hes a rain deer!





    Which of Santa's reindeer has bad manners?



    Rude-olph!





    What do you call a reindeer wearing ear muffs?



    Anything you want because he cant hear you!





    What do reindeer always say before telling you a joke?



    This one will sleigh you!





    How does Rudolph know when Christmas is coming?



    He looks at his calen-deer





    How many reindeer does it take to change a light bulb?



    Eight! One to screw in the light bulb and seven to hold Rudolph down!
    Reindeer Jokes..............?
    LOL. Great way to cheer me up.

    thanks for the laugh.
    Reindeer Jokes..............?
    HAHAHAAHAHAHAAHAHAHAHAH!!!!





    THATS SO FUNNY, WERE DID U GET THEM? :-)
    Those were pretty cute.
    a little childless!!