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The Honda CB Twister

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  • Pinaki
    replied
    Re: The Honda CB Twister

    In general , if the AFR adjustment screw is nearer to the air-intake port of the carburetor it's an air-adjusting screw . If it's nearer or adjacent to the fuel intake on the carb , it's a fuel adjusting screw .
    The carburetor used on twister / yuga is very closely similar to that on the splendor engines . It's an keihin PB unit . Possibly they are the same , given honda's trait of reusing well tried & tested parts from their inventory on newer models .

    http://www.keihinfie.com/html/pbtype.htm
    Last edited by Pinaki; 07-25-2013, 12:44 PM.

    Leave a comment:

  • dream_victor
    replied
    Re: The Honda CB Twister

    Originally posted by sachin1111 View Post
    that tutorial given on" B I K E A D V I C E" blog does not apply to Twister. Twister has Air screw.....this air screw controls the amount of air flow. If you turn the screw anticlockwise it will allow more air to pass and therefore the mixture becomes lean and turning it clockwise will reduce air flow which will give rich mixture. so you need to give just the right amount of air. quantity of fuel delivered will not change....since it depends on size of jet installed in carburetor. hope this helps.
    Thanks sachin1111 and mrbabu this definitely helps , BTW i think i forgot to mention earlier but my bike is Dream Yuga and I know I should have posted this in DY thread but i felt I would get better response from Twister thread as its more active and has more friendly community and i thought the engine mechanicals are the same for both, looks like no two bikes are the same
    Do you know by any chance that the same carb is used on DY as well ? I think the settings may not be the same as Twister but if DY also has a Air screw instead of fuel screw then that explains behavior that i have seen with my bike
    Also general question, how do i identify if its a Air screw or a Fuel screw available on carburettor ?

    Leave a comment:

  • sachin1111
    replied
    Re: The Honda CB Twister

    Originally posted by dream_victor View Post
    OK, this is new to me, i had read this carb tuning guide posted in http://**********.in/tuning-carburet...el-efficiency/

    Quoting from this
    "Fuel screw is located on the carb but its near the engine. [Engine - Fuel screw - Carburetor]. If the make of your carb is Mikuni (Pulsar, Yamaha, Fiero) the fuel/air screw probably will be of brass (golden colour). If you fully unscrew this screw and take it on your hand, you will see a needle like tip.

    Apart from the above difference I gave between Air and Fuel screw, there is one more major difference. Fuel screw turned in (clockwise) gives a lean mixture and turned out (anti-clockwise) gives a rich mixture. Air screw turned in gives a rich mixture and turned out (anti-clockwise) gives a lean mixture. Lean means more air, less fuel. Rich means more fuel, less air. This ends the basics. "

    i thought all the 4 stroke engines came with fuel screw and so turing them anti clockwise would make the mixture more rich, Is this different for Honda engines ?
    that tutorial given on" B I K E A D V I C E" blog does not apply to Twister. Twister has Air screw.....this air screw controls the amount of air flow. If you turn the screw anticlockwise it will allow more air to pass and therefore the mixture becomes lean and turning it clockwise will reduce air flow which will give rich mixture. so you need to give just the right amount of air. quantity of fuel delivered will not change....since it depends on size of jet installed in carburetor. hope this helps.
    Last edited by sachin1111; 07-24-2013, 06:14 PM.

    Leave a comment:

  • mrbabu76
    replied
    Re: The Honda CB Twister

    Bro internet blogs will confuse you. For a moment forget everything and understand that Twister has an air screw. Based on this try your tuning, you will get results.
    First try with default 1.5 turns out then do your experiment.

    Leave a comment:

  • dream_victor
    replied
    Re: The Honda CB Twister

    Originally posted by mrbabu76 View Post
    Please understand that if you turn the AFR screw anticlockwise lean mixture not rich. Adjust accordingly and post here. Default factory setting in my bike was 1.5 turn anticlockwise after fully closed position.
    OK, this is new to me, i had read this carb tuning guide posted in http://**********.in/tuning-carburet...el-efficiency/

    Quoting from this
    "Fuel screw is located on the carb but its near the engine. [Engine - Fuel screw - Carburetor]. If the make of your carb is Mikuni (Pulsar, Yamaha, Fiero) the fuel/air screw probably will be of brass (golden colour). If you fully unscrew this screw and take it on your hand, you will see a needle like tip.

    Apart from the above difference I gave between Air and Fuel screw, there is one more major difference. Fuel screw turned in (clockwise) gives a lean mixture and turned out (anti-clockwise) gives a rich mixture. Air screw turned in gives a rich mixture and turned out (anti-clockwise) gives a lean mixture. Lean means more air, less fuel. Rich means more fuel, less air. This ends the basics. "

    i thought all the 4 stroke engines came with fuel screw and so turing them anti clockwise would make the mixture more rich, Is this different for Honda engines ?

    Leave a comment:

  • mrbabu76
    replied
    Re: The Honda CB Twister

    Originally posted by dream_victor View Post
    Thanks for the quick response mrbabu
    My bike gives black smoke under following conditions
    1. Run the bike for some time to ensure it has warmed up
    2. Keep the bike in idle for some time ( say 30-40s in a traffic signal)
    3. increase the throttle -> the bike behaves like the fuel is cut off and i see black smoke and after that bike returns to normalcy

    If the turn AFR to even 1/8th anti clockwise from the setting i dont see this problem, but i suspect that the mileage would take a hit as the mixture is turning richer, but the picture seems to indicate its running rich already !!!

    I didnt understand your comment 1 and 2 above, Im guesing you meant 2 full turn from fully closed position ? my understanding is that turning the AFR screw wuold make the mixture lean, please correct me if Im wrong
    Please understand that if you turn the AFR screw anticlockwise lean mixture not rich. Adjust accordingly and post here. Default factory setting in my bike was 1.5 turn anticlockwise after fully closed position.

    Leave a comment:

  • dream_victor
    replied
    Re: The Honda CB Twister

    Originally posted by mrbabu76 View Post
    I am feeling that your are running with rich carb setting because there is petrol trace in your plug threads. May be your bike will give you black smoke when you rev hard.
    If you are familiar with AFR screw and Idling screw follow as below.

    1.Mark your present position of your AFR screw in case to revert back. I guess it is less than 1 full turn from fully closed position(clockwise).
    2.If you reach fully closed position(please be gentle don't apply pressure), slowly turn anticlockwise to 1.5 turns(360+180 deg).
    3.Start the engine and warm up and then adjust the idle speed using Idling screw.

    Ride your bike normally for few kms and inspect your spark plug.
    Thanks for the quick response mrbabu
    My bike gives black smoke under following conditions
    1. Run the bike for some time to ensure it has warmed up
    2. Keep the bike in idle for some time ( say 30-40s in a traffic signal)
    3. increase the throttle -> the bike behaves like the fuel is cut off and i see black smoke and after that bike returns to normalcy

    If the turn AFR to even 1/8th anti clockwise from the setting i dont see this problem, but i suspect that the mileage would take a hit as the mixture is turning richer, but the picture seems to indicate its running rich already !!!

    I didnt understand your comment 1 and 2 above, Im guesing you meant 2 full turn from fully closed position ? my understanding is that turning the AFR screw wuold make the mixture lean, please correct me if Im wrong

    Leave a comment:

  • rajaselvam_1987
    replied
    Re: The Honda CB Twister

    Hi to all after a long rest i'm coming back.

    Originally posted by shubhakv View Post
    crash guard for honda twister

    hi everyone

    right side crash guard has been cut off.....i have never made my bike fall ..do not know how it happened.... Shubha K V
    You have to go a local fabrication shop. There they will fix the both bar & the lip together by welding, i did this on my bike on both side bars.

    Originally posted by sachin1111 View Post
    shubhaky, this is crash bar....its a larger size thus covers the foot-peg area.i think it will provide some protection to our feet as well.
    Which bike crash guard is tihis.

    Originally posted by Ullysius Cabral View Post
    The self start and horn of my bike are not working for the past 2 days. I think its due to the rains. Is there any way to fix it by myself?
    Bro first check both the 10 & 15 Amps FUSE which placed near to battery.

    Originally posted by 6th Gear View Post
    Wasnt following this thread for few months now. Thanks to changes in my worklife.. getting to read older posts only now...

    [QUOTE
    Friends here all are discussing about the AFR. Is anybody tried a Shell Petrol.
    2 days back i tried, wow it's superb.
    Guys i got 86kmpl on that. It's just costs 3rs more per liter.
    I've used Shell Petrol as you said i too got something around 85kmpl mileage but for my bad luck no bunks near to home.

    ----consecutive posts auto-merged-----

    Friends yesterday i've replaced the rear shocks to Pulsar 150's one
    Seat height got decreased but shocks absorbing quality is good.
    And changed the chain sprocket & engine oil
    Carburetor got cleaned

    1. Pulsar shocks - Rs.1420
    2. Chain Sprocket - Rs.880
    3. Engine Oii elf gold - Rs.240
    4. Labour - Rs.250

    Leave a comment:

  • sachin1111
    replied
    Re: The Honda CB Twister

    Originally posted by dream_victor View Post
    folk, need help to read a sparkplug, i have attached a snap shot of my sparkplug, i know that a proper setting is to see brownish color but the question whether i consider the color at the tip of the sparkplug or the ceramic tip of the spark plug or the base of the sparkplug. You can see from attached image that the tip of the sparkplug seems to be dark gray, ceramic tip is dark brown and the base of the sparkplug has black colour, also there seems to be oily stuff the svrew thread part
    If anybody has a snap shot of sparkplug on their perfectly machine would also help
    Thanks
    dude, the pic is bit dark to read.....but condition is not bad...seems little rich setting. even with good tuning ,spark plugs can show black spots if you are doing Continuous low speed driving and/or short trips. this link below will give idea on how to read spark plug.

    NGK Spark Plugs USA

    ----consecutive posts auto-merged-----

    Originally posted by smartrider View Post
    ok buddy,I'll check the clutch freeplay.I am planning of a rear tyre upgrade.I think I can[ATTACH=CONFIG]108838[/ATTACH] have dazzler's stock rear tyre for my twister.It looks heavy too.
    110/80 is bit too large for Twister....go for 100/90-17.
    Last edited by sachin1111; 07-22-2013, 01:58 AM.

    Leave a comment:

  • mrbabu76
    replied
    Re: The Honda CB Twister

    Originally posted by dream_victor View Post
    folk, need help to read a sparkplug, i have attached a snap shot of my sparkplug, i know that a proper setting is to see brownish color but the question whether i consider the color at the tip of the sparkplug or the ceramic tip of the spark plug or the base of the sparkplug. You can see from attached image that the tip of the sparkplug seems to be dark gray, ceramic tip is dark brown and the base of the sparkplug has black colour, also there seems to be oily stuff the svrew thread part
    If anybody has a snap shot of sparkplug on their perfectly machine would also help
    Thanks [ATTACH=CONFIG]109254[/ATTACH]
    I am feeling that your are running with rich carb setting because there is petrol trace in your plug threads. May be your bike will give you black smoke when you rev hard.
    If you are familiar with AFR screw and Idling screw follow as below.

    1.Mark your present position of your AFR screw in case to revert back. I guess it is less than 1 full turn from fully closed position(clockwise).
    2.If you reach fully closed position(please be gentle don't apply pressure), slowly turn anticlockwise to 1.5 turns(360+180 deg).
    3.Start the engine and warm up and then adjust the idle speed using Idling screw.

    Ride your bike normally for few kms and inspect your spark plug.

    Leave a comment:

  • dream_victor
    replied
    Re: The Honda CB Twister

    folk, need help to read a sparkplug, i have attached a snap shot of my sparkplug, i know that a proper setting is to see brownish color but the question whether i consider the color at the tip of the sparkplug or the ceramic tip of the spark plug or the base of the sparkplug. You can see from attached image that the tip of the sparkplug seems to be dark gray, ceramic tip is dark brown and the base of the sparkplug has black colour, also there seems to be oily stuff the svrew thread part
    If anybody has a snap shot of sparkplug on their perfectly machine would also help
    Thanks Click image for larger version Name: sparkplug1.jpg Views: 1 Size: 95.7 KB ID: 1851656

    Leave a comment:

  • smartrider
    replied
    Re: The Honda CB Twister

    ok buddy,I'll check the clutch freeplay.I am planning of a rear tyre upgrade.I think I canClick image for larger version Name: DRT.jpg Views: 2 Size: 57.3 KB ID: 1851345 have dazzler's stock rear tyre for my twister.It looks heavy too.

    Leave a comment:

  • sachin1111
    replied
    Re: The Honda CB Twister

    Originally posted by smartrider View Post
    I doubt if the power is distributed properly among the gears because whenever I shift from 1st to 2nd there is an initial stalling.I think the 1st gear doesn't generate enough momentum for the 2nd to operate.Is this normal?
    check the clutch free play...may be it requires some adjustment. you need to partially use clutch in second gear during initial acceleration for smooth transfer of power from 1st to 2nd gear. also check the idle RPM...if it is set low then bike will stall. by the way first and second gear on Twister are very closely mated.....so first gear is just to get the bike moving from standstill and second gear is for actual riding.
    Last edited by sachin1111; 07-18-2013, 07:20 PM.

    Leave a comment:

  • smartrider
    replied
    Re: The Honda CB Twister

    I doubt if the power is distributed properly among the gears because whenever I shift from 1st to 2nd there is an initial stalling.I think the 1st gear doesn't generate enough momentum for the 2nd to operate.Is this normal?

    Leave a comment:

  • sachin1111
    replied
    Re: The Honda CB Twister

    Originally posted by Ullysius Cabral View Post
    The self start and horn of my bike are not working for the past 2 days. I think its due to the rains. Is there any way to fix it by myself?
    check battery voltage and connections to battery. if voltage has dropped below 8 volts then charge it. if voltage is ok...then check the +ve and -ve contact points of battery, i.e wipe the contact points with dry cloth for any water,rust, dirt etc and tighten the screws that connects the wire.

    Leave a comment:

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