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Thread: Unique 70CC Engine Missing

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    Default Unique 70CC Engine Missing

    Hey,

    I need some expert advise i have brought Unique 70cc 2013 few months back. Repaired its engine on 50 cylinder size. engine seems good. but i am facing issue with missing problem during running on 4th gear or pickup. seems like engine is low with petrol whereas i have full tank.

    changed the carburetor twice. then we remove the air pipe from the carburetor and let the engine breath openly with out filter. it was an amazing experience, engine power was compatible with 125.

    then we again fit air filter back and cut pipe from end. still same problem. now we have installed its genuine carburetor back. all seem good but still its slightly missing in 4th gear.

    can anyone advice what should i do?

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    Quote Originally Posted by asad12347 View Post
    Hey,

    I need some expert advise i have brought Unique 70cc 2013 few months back. Repaired its engine on 50 cylinder size. engine seems good. but i am facing issue with missing problem during running on 4th gear or pickup. seems like engine is low with petrol whereas i have full tank.

    changed the carburetor twice. then we remove the air pipe from the carburetor and let the engine breath openly with out filter. it was an amazing experience, engine power was compatible with 125.

    then we again fit air filter back and cut pipe from end. still same problem. now we have installed its genuine carburetor back. all seem good but still its slightly missing in 4th gear.

    can anyone advice what should i do?
    Dear check the spark plug of your bike is it short or not it can be a cause of missing in 4th gear

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    Quote Originally Posted by hamikhan View Post
    Dear check the spark plug of your bike is it short or not it can be a cause of missing in 4th gear
    short spark plug will cause missing in all gear even on idle not only on 4th gear

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    Quote Originally Posted by saboor73 View Post
    short spark plug will cause missing in all gear even on idle not only on 4th gear
    Dear saboor ali saad i have faced this problem in my bike ever because of short plug bike also does not go to its top speed

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    Quote Originally Posted by hamikhan View Post
    Dear check the spark plug of your bike is it short or not it can be a cause of missing in 4th gear
    Thanks for the reply !

    We have changed its Plug, Coil Kara, CDI, Air Filter, cleaned all the wiring but no good.

    I have changed around 5 to 6 carburetor (Saz, Future, CRLF) but every carburetor is having missing problem. Yesterday we give it a go on Lifan Carburetor overall bike was good. good pickup and strong performance but when we go above 40 or 50 bike starts missing.

    its going fine only on its original carburetor. with original carburetor no missing / nothing. but my carburetor is week so i have to change it as its not that performance as we aspect from the engine.

    any idea about a good carburetor or carburetor jet?

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    we have changed its Plug, coil kara, CDI but no use.

    when we change its carburetor engine starts missing. when we install its original carburetor then no issue but due to weak carburetor performance is not good.

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    Quote Originally Posted by asad12347 View Post
    we have changed its Plug, coil kara, CDI but no use.

    when we change its carburetor engine starts missing. when we install its original carburetor then no issue but due to weak carburetor performance is not good.
    Assalam o Alikum,

    Dear asad12347, hope you are doing well. I have also changed carburetor on my Unique 70 about 8 months ago and it started missing. And no matter what carburetor you will use, bike will show some missing. So i did some research and change my new carburetor pin with old carburetor pin and then every thing went fine till now. This is the pin which i changed. Insha Allah if you replace it with your old carburetor then everything will be fine.
    Unique 70CC Engine Missing -1563054
    The winner ain?t the one with the fastest car, it?s the one who refuses to lose.

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    Quote Originally Posted by dusama_90 View Post
    Assalam o Alikum,

    Dear asad12347, hope you are doing well. I have also changed carburetor on my Unique 70 about 8 months ago and it started missing. And no matter what carburetor you will use, bike will show some missing. So i did some research and change my new carburetor pin with old carburetor pin and then every thing went fine till now. This is the pin which i changed. Insha Allah if you replace it with your old carburetor then everything will be fine.
    Unique 70CC Engine Missing -1563054
    this is called jet

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    bro i have same problem with my unique when i take it to mechanic he changed the jet size from 78 to 72 and bike is now fine kindly changed your main jet size to 72 and if bike still missing then changed it to 68 i hope your problem will solved inshallah.

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    Quote Originally Posted by mohsinwahhab View Post
    bro i have same problem with my unique when i take it to mechanic he changed the jet size from 78 to 72 and bike is now fine kindly changed your main jet size to 72 and if bike still missing then changed it to 68 i hope your problem will solved inshallah.
    Thanks all for the reply. today my mechanic said the same thing to change its jet, please let me know that from where i will get the jets? are they available from market?

    i heard that jets are not available for purchase from shops. they only came with carburetor fitted.

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    Jet are avilable in open market and you can find it any good motorcycle spare parts shop.

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    thanks boss !

    i will check tomorrow, lets see whats the result. its over a month now and no solution yet.

    tell me one more thing if i change it main jet? does it effect the fuel average?

    and i have Lifan carburtor (CRLF) is it a good carburetor?

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    when u put small number jet fuel average is increase and i don,t know much about CRLF carb @asjdsm will guide u he is guru of carb

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    .................

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    missing might be due to the improper facing of carb inlet pipe and carb outlet .. the inside dia of the aluminium pipe connecting carb to head must be of same size as that of carb and both holes should be perfectly aligned .. i suspect in your case its not..

    if they are and is your bike 78cc or 72 cc one ? if 72cc then try 68-70-72 main jet. it costs 35-50 rs each.

    if its 78cc then try 75,78 mj.

    buy any vendor jet and make sure that the hole in jet is in center ..

    is your bike useing euro 2 style carb or normal one ?

    lifan is very poor quality carb.. i had a thread about that as well...

    increasing jet size will increase fuel consumption.. dec will reduce fuel consumption


    Quote Originally Posted by asad12347 View Post
    Thanks all for the reply. today my mechanic said the same thing to change its jet, please let me know that from where i will get the jets? are they available from market?

    i heard that jets are not available for purchase from shops. they only came with carburetor fitted.

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    Quote Originally Posted by asjdsm View Post
    missing might be due to the improper facing of carb inlet pipe and carb outlet .. the inside dia of the aluminium pipe connecting carb to head must be of same size as that of carb and both holes should be perfectly aligned .. i suspect in your case its not..

    if they are and is your bike 78cc or 72 cc one ? if 72cc then try 68-70-72 main jet. it costs 35-50 rs each.

    if its 78cc then try 75,78 mj.

    buy any vendor jet and make sure that the hole in jet is in center ..

    is your bike useing euro 2 style carb or normal one ?

    lifan is very poor quality carb.. i had a thread about that as well...

    increasing jet size will increase fuel consumption.. dec will reduce fuel consumption
    Thanks for your detail review.

    yesterday i opened carburetor my self and really Lifan is very poor quality Carb. I have requested shop keeper for Saz Carburetor. I guess its better than Lifan.

    anyway when i opened the Lifan carb its main Jet was on 72 and as i check with my Genuine Carburetor it was on 78.

    purchased a 78 Main Jet (Taiwan) cost me 40 Rs. and Alhamdulillah no missing. bike running smooth and perfect.

    need one advice should i change my Lifan Carb with Saz? or just use Lifan as carb is set now?

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    Quote Originally Posted by asad12347 View Post
    Thanks for your detail review.

    yesterday i opened carburetor my self and really Lifan is very poor quality Carb. I have requested shop keeper for Saz Carburetor. I guess its better than Lifan.

    anyway when i opened the Lifan carb its main Jet was on 72 and as i check with my Genuine Carburetor it was on 78.

    purchased a 78 Main Jet (Taiwan) cost me 40 Rs. and Alhamdulillah no missing. bike running smooth and perfect.

    need one advice should i change my Lifan Carb with Saz? or just use Lifan as carb is set now?
    Post inside snaps of both the carbs esp the float balls

    Sent from my GT-I9300 using Tapatalk

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    Quote Originally Posted by asjdsm View Post
    Post inside snaps of both the carbs esp the float balls

    Sent from my GT-I9300 using Tapatalk
    boss i have fitted the carb, posting some outside pics

    i will take some pics in evening from inside then i can post.
    Attached Images Attached Images   

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    Quote Originally Posted by asjdsm View Post
    Post inside snaps of both the carbs esp the float balls

    Sent from my GT-I9300 using Tapatalk
    Need Help, Can anyone suggest where can i find pilot jet of 24 Size?
    Attached Images Attached Images  

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    @asjdsm need help, my bike is 78cc, i changed the main jet size to 78, now no missing issue but on 3rd gear bike ghoot rahi h. 3rd gear mai khicho to thori ghooti h phr normal ho kr pick pkrti h easily touches 50 - 60 in 3rd gear, smoot through nai arha, then we replaced my carburetor with a unique of shop keeper, its main jet was on 78 and pilot was on 24 (Lifan Carb). the performance was good. no problem at all. 100% result.

    then we searched market for 24 # pilot jet and couldnt find it. i was thinking to replace main jet with 80. is it a good idea? else where can i find it? or any carb suggestion that can meet my engine requirment.

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