YBR Carb mixture screw?

[optimist_lad]

Can anyone tell which one is the air/fuel mixture screw in these pictures of my YBR? What are the rotation directions for rich & lean mixture? Thanks.

[optimist_lad]

@vickytulla Bike newton help me out here

[optimist_lad]

@eidee80 Mohsin bro you know about mixture screw, Please advise.

[hamikhan]

Below is mixture screw photo its not mine carb mein say jo pipe engine ko jaa raha hay oss side per carb per down side jo 2 kalar niklay huay hain un mein say 1 mixture screw hay clock wise tight krnay say air jana kum hoti hay anti clock wise open krnay say air+fuel zyda jana shuru hota hay

[optimist_lad]

Itni awkward jaga mein hai, koi small screw driver dhoondna parega...

[vickytulla]

@vickytulla Bike newton help me out here

yes what can I help ? from the moment pak wheels has updated I am nt able to understand which is the threads main post so I can read it to understand he question. you can brief me then if I can be useful then I can guide...

[optimist_lad]

Vivkytulla bro I have bought new YBR 2017, 2100kms driven. It starts missing after 7k-8k RPMs. I have heard that YBR carb comes with lean mixture from factory. I wanted to know the mixture screw settings... as hakim said Anti-clockwise = rich mixture so I will try to adjust 1/2 anti-clockwise and see if bike still misses. My bike also backfire when changing gear which is symptom of lean mixture If I am not wrong...

[optimist_lad]

@hamikhan There is no way to adjust that screw... It's impossible for me. It's in such an awkward position that I can't even see the damn screw. Frustrated.

[vickytulla]

every bike hsa its own tools even CG has a mixture screw facing down wrd and requires slim and special screw driver to tune it normal screw driver wont fit there...

You need to use special YBR carb tuning driver or else you can remove the carb and lean/rich it a bit and fit it back...

There is no way to adjust that screw... It's impossible for me. It's in such an awkward position that I can't even see the damn screw. Frustrated.

[optimist_lad]

Hmm okay.. vicky bro I'll post my review and impressions in a new topic on this bike so far in a few minutes. I'll mention you too, If you find something odd then tell me.

[vickytulla]

saw ur review you wrote it excellent, and yes 105~110 is the best this bike can do in normal situation taking it above it means you are hurting bike internal which are not made to run that fast.

[optimist_lad]

well said bro, I am satisfied

[eidee80]

hamikhan
described well, nd i also described in my post

[eidee80]

Purchase a screw driver specially built for such working; from Raja Bazaar,
its available easily

[awaiz43]

No. 1 is air mixture screw other one is block there is no screw there. its best to follow the standard mixture setting procedure when the engine is start and bit warm.
1. start the engine and warp it up.
2. set the idle RPM at 2K.
3. now close the air mixture screw by turning it anti clock wise close it completely dnt apply extra force.
4. when the screw is completely closed or tight now start turning the screw 1/4 of a turn gradually clockwise and check the idle rpm continuously keep turning slowly at 1 point u ll get the maximum rpm around 4K RPM. this is best setting. just turn a bit or 1/4 of a turn further clock wise for best mileage setting.
experts here kindly check this if something wrong is stated kindly do the correction.

[awaiz43]

i didnt find any suitable screw driver that can b used for this tiny and hard position screw. just grab a phase tester go to a welder shop or to a lath machine ask him to cut the tester about 2inch and put some metal by welding or for precise and good looking toll u can make a good looking base. this will help u to set the mixture screw. i have noticed the Yamaha mechanics dnt set the mixture when the engine is in start position they just open the carb. and set it and put it back i think its not the procedure mixture should be adjusted at start engine.

[optimist_lad]

Yes, engine should running when setting A/F mixture. There is a very good video about how to tune butterfly carb by an Indian dude on Youtube.

[awaiz43]

i have seen some videos and got this method by 1 fellow on PW and same procedure is shown by a gora on youtube. kindly share the link of video that u mentioning. and and very good page admin on FB told me this procedure.

[optimist_lad]

This is the video, well explained.

[atifsha9]

Awais bhai I've put a very small screw driver but I couldn't find mixture screw. Can u help me plz

ATIF