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Cb250ne 12/81 require manual for bike engine & carburettors

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When I start my bike "Enfield bullet 1976 model" I dont notice any problem but while moving it, it misfires and and even brings me to a halt.when i start again it wont start immediately.


The more older a vehicle gets the more attention it requires. Go to a reputed me hanic and clean up the carburettor airfilter and spark plugs as these three are the main components which help in the start stop and running of fhe bike also misfiring occurs mostly due to unclean carburettor newly fitted airfilter or if engine is running rich.

Jan 04, 2016 | Motorcycles

Tip

Bike Maintenance Tips


  • Regularly check tyre condition and air pressure. Optimum air pressure in the tyres of the bike is important for maximum road grip, stability, riding comfort and longevity of the tyres.
  • While under-inflated tyres wear unevenly, adversely affect handling, and more likely to fail from being overheated, over inflated tyres make the motorcycle ride more harshly, and more prone to damage from surface hazards, and wear unevenly.
  • Check your tyres for cuts and scrapes on your tires, which could cause a blowout. Also check the tyre treads once a week and have the wheels balanced and the alignment checked if the wear is uneven.
  • Engine oil plays an important role in ensuring smooth operation and maintenance of the bike and maintaining a correct engine oil level is important. Check engine oil level each day before operating the two–wheeler. Oil level should be between upper and lower marks. Top up engine oil if required. Check for oil leakage.
  • Clean the two-wheeler body surface regularly to maintain the surface finish. Before cleaning the motorcycle, ensure that the ignition switch unit, H.T. Coil and silencer are covered using plastic sheets.
  • Clean the motorcycle using low-pressure water. All painted surfaces should be washed only with water, as kerosene or detergent will damage the paint.
  • The motorcycle battery needs periodical maintenance to ensure a long and trouble free life. Check the electrolyte level against the top and bottom markings on the battery shell. Always top up with distilled water whenever required.
  • Check for any leakage from battery. It should be clean and free from any leakages. In case of non-use of motorcycle, battery should be kept fully charged and electrolyte level should be at Top mark.
  • Clean spark plug regularly. Every 750 km for two-stroke bike and every 1,500 km for four-stroke bike. Clean spark points (electrodes) with emery paper.
  • Keep carburettor clean. Every 1500 km, clean out the carburettor float chamber and other parts. Clean jets by forcing compressed air through them.
  • Keep both brakes properly spaced. Keeping them too tight (too urgent), or too loose (too late) is dangerous. Brakes should be tightened as per the rider’s personal style and requirement.
  • Check cables regularly for kinks, bends and frayed ends. Especially check ends. If one or more strands appear broken, replace immediately.
  • Always ensure that the tax is paid and Insurance cover (Insurance policy) is within validity period. Keep Tax Receipt and Insurance policy at home and keep xerox copy in bike.
  • on Mar 03, 2010 | Cycling

    1 Answer

    With apprila Rs 125cc 2 strokes bike. I fill up with 98 octane unleaded and I poured 2 strokes oil Into petrol tank. is it possible can damage the engine?. at the moment I couldnt start the engine.


    well you cant damage it by doing that but if you put too much n and didnt shake it well it will settle at the bottom of the fuel tank and fill the carburettor up with oil as oil is heavier than petrol.why are you not using the oil tank and oil pump fitted to the bike ?best thing to do is put a new spark plug in it turn the fuel tap off roci the bike bacwards and firwards to mix the oil and fuel in the tank,and drain the carburettor by undoing the 14mm nut in the centre of the bottom of the carb,then turn the fuel back on and try and start it up.

    Dec 10, 2015 | Motorcycles

    1 Answer

    2002 650 Vstar bike hasnt been started in 1 1/2 years. drained gas and put in new with seafoam, also changed plugs and air and fuel filters. bike is very cold blooded. will not start or run with out the...


    G'day. Sounds very much like you have blockages in the carburettors- probably the main jets & emulsion tubes.
    You will need to remove the carburettors, diss-assemble them & thoroughly clean them.
    I thought that this link may help if you want to do it yourself.
    It will show exploded diagrams of them.
    http://www.mrcycles.com/fiche_section_detail.asp?section=281601&category=motorcycles&make=YAMAHA&year=2002&fveh=6827

    Particular attention to parts-8,9,10,11,& 12.
    I feel sure you'll find part 11(main nozzle) will have blockages in the pin size holes in the side of it.
    These are critical for proper fuel atomization. They commonly get blocked by a goup that forms in the carbies when fuel has been left in them for a long time.
    I jope this has been of some help
    Regards Andrew Porrelli

    Jun 05, 2011 | 2002 Yamaha V Star Classic

    2 Answers

    When turn on petrol and kick bike, petrol is running out of overflow pipe on carb and bike wont start, and bike sounds flooded.


    You have a sticking float in the carburator, due to old gas, or dirt. The float moves a needle that turns on and off the flow of fuel into the carb bowl.

    Mar 23, 2011 | 2003 Suzuki RM 125

    1 Answer

    How to tune for millage for hero Honda bike please show with diagrams


    when it is coming to mileage TUNING, it covers only carburettor area, for tuning carburettor tuning first you should want to make the engine to run upto 4000rpm and in that engine rpm only you should want to adjust the Air Screw for 1.5 turns and at last maintain the engine idling condition at 750 ± 10 rpm. then check for 100ml test, or else check reserve to reserve check

    Apr 06, 2010 | 2006 Hero Honda CD Deluxe

    1 Answer

    How and where do you adjust the synch on 1986 gsxr


    I can help with this.
    On the earliest models they had slide type carburettors. This is to say that the slides were actuated by the throttle cable acting on a linkage that physically lifts the slides in the carburettors. This type of carburettor has its balance(syncronization) adjusters under the caps on top of the carburettors.(the cap isn't round & has 3 screws in it)
    Number three carburettor is fixed & dosn't get adjusted.

    You'll have to put the bike next to a bench & attatch a long piece of fuel hose from the tank to the fuel hose on the carburettors.You can join the two pipes together using a short piece of hose that snuggly fits on the outside or inside of the two hoses. You can also join them with a suitable shirt piece of metal pipe,or what is called here in Australia a P3 barb.These are available from tool suppliers that supply air compressor hoses & fittings.
    (I made a remote tank from an old lawnmower petrol tank,a long piece of hose & mounted it on a tall stand.Under it I have a tray with all my different adaptors in it.)

    You adjust number 2 cylinder to the same vacume reading as number 3 cylinder first.
    Now adjust number 1 cylinder to the same vacume reading as number 2 cylinder.
    Next adjust number 4 cylinder to the same vacume reading as number 3 cylinder.
    Recheck that they are all the same & your done.
    The adjusters are of the screw & locknut(8mm)type.
    You can struggle with an 8 mm ring spanner & a flat bladed screwdriver,buy an adjusting tool(genuine, or non-genuine from a bike shop) or make one.

    To make one you weld a bar onto the side(at the top)of an 8mm extended quarter inch drive socket.Then find a long small screwdriver that will fit down the hole.

    After you make each adjustment,stop the engine & open the throttle wide open & release a couple of times.(This seats the slide).After diong this re-start the engine & re-check your adjustment.
    I place a fan blowing on the engine to help control the engine temperature as the adjustment can be a bit of a fiddle.

    I prefer to use mercuary type vacume guages as they dont go out of calibration.

    If you are using dial type guages check that they are all reading the same by checking them all one by one on the same cylinder.
    Some Suzukis' have a pipe (covered with a black rubber stopper) at the top of each carburettor(at the front) & others have an allen screw on the cylinder in front of the carburettor manifold rubber.
    If yours has the allen screw you will also need adaptors that screw into the hole once the allen screw is removed.

    If you bike has diaphram type carburettors on it(you'll be able to recognise this by the top caps of the carburettors being black & roundish in shape & held in place by 4 screws), the adjusting screws are between each carburettor & are the spring loaded type.
    The adjusters are located in-between each pair of carburettors visable from the top.
    These are easier to adjust as there is no lock nut to struggle with & all you need to turn the adjusting screws is a long (flat or phillips)screwdriver.
    Again, balance the center two first,then the left pair then the right pair.

    This procedure is applicable to all in line 4 cylinder motorcycles (even most fuel injected ones.

    Regards Andrew Porrelli

    Nov 26, 2009 | 1986 Suzuki GSX-R 750 G

    2 Answers

    2003 yamaha roadstar leak fuel sometimes after I shut it off I think the floats are sticking any solutions. Rick


    Yes Rick, try a couple of tricks I know.First,open the carburettor drain screw located at the base of the carburettor,this lets fuel flow out of the carburettor drain located next to/under it.(To acces this drain screw look between the engine cylinders from the LEFT of the bike)While the fuel is draining out,tap the fuel bowl.Next re-tighten the carby drain screw and see how that goes.I would suspect your bike has a vacumatic fuel tap that has 3 positions on it.1 marked on, 1 marked res, 1 marked pri.If the fuel leaks occur when in the on or res position this means part of your problem is a leaking diaphram in the fuel tap.Replace this & when engine isn't running,no fuel can flow to the carby when it's in the on or reserve positions.After ensuring the tap is ok, and trying the first trick,if it still leaks,well then you'll have to pull off the carby and give the needle and seat a clean.
    Hope this healps Regards Andy Porrelli

    Nov 23, 2009 | 2003 Yamaha Road Star Silverado

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