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**sandeepcf** · 04-05-2015, 02:33 PM

Re: Suzuki Gixxer 155

Originally posted by Ashwin Lakshmanan View Post

i know it drops but my question was more around how significant would the drop be. I usually get around 47 under normal driving conditions. I was expecting to get 35+ at high speeds but < 30 seems too less.

Same situation here also. I've already pointed out the abnormal mileage here. In Unicorn I used to get atleast 40kmpl+ at 100+ speeds.
But with Gixxer I got 32kmpl at 115~118kmph which is too low. My normal mileage is around 46kmpl.
since the last 5 litre refueling I was driving with utmost care not going beyond 60kmph in city and 70kmph and I got 53kmpl. This is the 2nd time I got mileage of more than 50kmpl.
May be we need to down size the main jet of our carburetor.
I am waiting for all the free services to be over and then I will try these kind of simple mods.

**rev** · 04-05-2015, 02:48 PM

Re: Suzuki Gixxer 155

Originally posted by sandeepcf View Post

My normal mileage is around 46kmpl.
since the last 5 litre refueling I was driving with utmost care not going beyond 60kmph in city and 70kmph and I got 53kmpl. This is the 2nd time I got mileage of more than 50kmpl.

Guys, i have always stayed within 65kmph / 5500 rpm and i have done city and highways (70:30), covered 2300kms so far...and the bike returns figures between 49 to 53 kmpl.

**anand roy** · 04-05-2015, 03:32 PM

Re: Suzuki Gixxer 155

Originally posted by sandeepcf View Post

Same situation here also. I've already pointed out the abnormal mileage here. In Unicorn I used to get atleast 40kmpl+ at 100+ speeds.
But with Gixxer I got 32kmpl at 115~118kmph which is too low. My normal mileage is around 46kmpl.
since the last 5 litre refueling I was driving with utmost care not going beyond 60kmph in city and 70kmph and I got 53kmpl. This is the 2nd time I got mileage of more than 50kmpl.
May be we need to down size the main jet of our carburetor.
I am waiting for all the free services to be over and then I will try these kind of simple mods.

Hi Sandeepcf
I dont think downsizing the mainjet will yield any marginal positive result rather it might make the air-fuel mixture lean causing the premature seizure of pistons.
However, you may go down one size (or two size=) although i would personally ask you not to as the factory settings are acquired after extensive research for a stock bike and then the bike hits the production.
For a 155cc engine the mileage you are getting is good.
Regards
Ride safe
Sent from my Micromax AQ4501 using xBhp Connect mobile app

Sent from my Micromax AQ4501 using xBhp Connect mobile app

**sandeepcf** · 04-05-2015, 03:45 PM

Re: Suzuki Gixxer 155

Originally posted by anand roy View Post

I dont think downsizing the mainjet will yield any marginal positive result rather it might make the air-fuel mixture lean causing the premature seizure of pistons.
However, you may go down one size (or two size=) although i would personally ask you not to as the factory settings are acquired after extensive research for a stock bike and then the bike hits the production.
For a 155cc engine the mileage you are getting is good.

True.
But the only concern is - the fuel consumption is too much at highspeeds.

**vjay** · 04-05-2015, 04:01 PM

Re: Suzuki Gixxer 155

Originally posted by sandeepcf View Post

True.
But the only concern is - the fuel consumption is too much at highspeeds.

you should also take into consideration that Gixxer has the better top-end power than other 150cc bikes...

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**Rahul.g** · 04-05-2015, 04:21 PM

Re: Suzuki Gixxer 155

Originally posted by sandeepcf View Post

True.
But the only concern is - the fuel consumption is too much at highspeeds.

Dont down size the main jet, it wont do you any good and it will also affect your bike's performance.
It will struggle to reach 100+ speeds then
And for a 155cc motor, crusing at 100+ kmph is not a good idea, it may damage it, 80 - 90 kmph should be ok though

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**anand roy** · 04-05-2015, 04:36 PM

Re: Suzuki Gixxer 155

Originally posted by sandeepcf View Post

True.
But the only concern is - the fuel consumption is too much at highspeeds.

Hi
speed and good mileage are inversely proportional is a wide known fact. The higher speed you ride in the more bike will consume fuel.

If riding on high speeds is a regular thing then you can get tune the carb a bit leaner by turning the af screw clockwise one or two turns keeping the iddle rpm stable or get the carb leaned up by a Mech (make sure you have covered 8 to 10 KMS before so that you have a warmed up engine and atleast half tank fuel)
The mileage should improve a bit.
Doing this you may again face some issues on cold start as the AFR is lean which is again not optimum for the engine.

If not then use 1/4 throttle while reaching a high speed which doesn't allow a lot of Fuel being passed into the engine. Get to a desired speed slowly. This cant help as well to achieve a better mileage.

Other elements that play a pivotal role in giving a good mileage are:

Less Clutch use
Clean Air filter
Smooth Acceleration
Correct tyre pressure.
Condition of the engine.

You can try out these methods before trying on a small mainjet.
Ride safe

**Dynamo** · 04-05-2015, 05:16 PM

Re: Suzuki Gixxer 155

Originally posted by anand roy View Post

Hi
speed and good mileage are inversely proportional is a wide known fact. The higher speed you ride in the more bike will consume fuel.

If riding on high speeds is a regular thing then you can get tune the carb a bit leaner by turning the af screw clockwise one or two turns keeping the iddle rpm stable or get the carb leaned up by a Mech (make sure you have covered 8 to 10 KMS before so that you have a warmed up engine and atleast half tank fuel)
The mileage should improve a bit.
Doing this you may again face some issues on cold start as the AFR is lean which is again not optimum for the engine.

If not then use 1/4 throttle while reaching a high speed which doesn't allow a lot of Fuel being passed into the engine. Get to a desired speed slowly. This cant help as well to achieve a better mileage.

Other elements that play a pivotal role in giving a good mileage are:

Less Clutch use
Clean Air filter
Smooth Acceleration
Correct tyre pressure.
Condition of the engine.

You can try out these methods before trying on a small mainjet.
Ride safe

For lean mixture I need to turn the AFR screw clockwise ? For gixxer right ? Bcoz I'm planning to tune myself. Anyway if I feel any discomfort I'll revert to stock setting. I'm getting 40-45 kmpl mileage.

At least I want 50 kmpl mileage.

Have tried any sort tuning ur carb ? U own gixxer ?

**John P Daniel** · 04-05-2015, 05:42 PM

Re: Suzuki Gixxer 155

Originally posted by Dynamo View Post

For lean mixture I need to turn the AFR screw clockwise ? For gixxer right ? Bcoz I'm planning to tune myself. Anyway if I feel any discomfort I'll revert to stock setting. I'm getting 40-45 kmpl mileage.

At least I want 50 kmpl mileage.

Have tried any sort tuning ur carb ? U own gixxer ?

If you mean abnormal fuel consumption, my p180 too had same issue and it was rectified by changing the carb needle. It has to be carb issue or air filter issue.

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**Vijay007** · 04-05-2015, 05:43 PM

Re: Suzuki Gixxer 155

Originally posted by Dynamo View Post

Friend the pic u attached is not I'm looking for. This is fuel drain screw. Click from opposite side ( great lever side ). Thank you for your effort.

This is what I clicked after long effort. But I think this is not what is required. This comes from my lack of proficiency in understanding what's required and frankly I dont understand what you will understand from pic??!

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Attached Files

**anand roy** · 04-05-2015, 05:52 PM

Re: Suzuki Gixxer 155

Originally posted by Dynamo View Post

For lean mixture I need to turn the AFR screw clockwise ? For gixxer right ? Bcoz I'm planning to tune myself. Anyway if I feel any discomfort I'll revert to stock setting. I'm getting 40-45 kmpl mileage.

At least I want 50 kmpl mileage.

Have tried any sort tuning ur carb ? U own gixxer ?

Hi Dynamo,
Yes I do know how to tune my own carb but it did require practise on my part.
Apologies but i was talking about the "bs 26 which is used in Yamaha fz or bs 29 used in rtr or pulsar 180" slide carbs.
Not sure about the type of carb used in gixxer. Best bet would be to get it tuned by a mech who do it for 20 odd bucks.
There are a few article on the net like-
1
http://**********.in/tuning-carburet...el-efficiency/

2

xBhp.com : The Global Indian Biking Community

http://www.xbhp.com/talkies/do-yourself/21264-carburetor-tuning-after-fixing-k-n-airfilter.html

3 http://www.team-bhp.com/forum/motorb...-properly.html
4 there are also YouTube videos which you can see and learn
5 the least and easiest way i learnt was through a mech so that if things go wrong you can take it back to the mech or do it in front of him a couple of times to learn.

Oh bdw, i have fzs since 2011
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**Dynamo** · 04-05-2015, 08:25 PM

Re: Suzuki Gixxer 155

Originally posted by anand roy View Post

Hi Dynamo,
Yes I do know how to tune my own carb but it did require practise on my part.
Apologies but i was talking about the "bs 26 which is used in Yamaha fz or bs 29 used in rtr or pulsar 180" slide carbs.
Not sure about the type of carb used in gixxer. Best bet would be to get it tuned by a mech who do it for 20 odd bucks.
There are a few article on the net like-
1
http://**********.in/tuning-carburet...el-efficiency/

2

xBhp.com : The Global Indian Biking Community

http://www.xbhp.com/talkies/do-yourself/21264-carburetor-tuning-after-fixing-k-n-airfilter.html

3 How to tune your carb properly - Team-BHP
4 there are also YouTube videos which you can see and learn
5 the least and easiest way i learnt was through a mech so that if things go wrong you can take it back to the mech or do it in front of him a couple of times to learn.

Oh bdw, i have fzs since 2011
Sent using xBhp Connect mobile app

Thank you. Gixxe's carb is UCAL UCD29-9. I've also seen many carb tuning videos in you tube. Let me try one full clockwise turn & check mileage & performance.

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

Originally posted by Vijay007 View Post

This is what I clicked after long effort. But I think this is not what is required. This comes from my lack of proficiency in understanding what's required and frankly I dont understand what you will understand from pic??!

Sent from my XT1033 using xBhp Connect mobile app

This is what i need. This is mine & u can see the brass screw over there is AFR.

**John P Daniel** · 04-05-2015, 08:58 PM

Re: Suzuki Gixxer 155

Originally posted by Dynamo View Post

Thank you. Gixxe's carb is UCAL UCD29-9. I've also seen many carb tuning videos in you tube. Let me try one full clockwise turn & check mileage & performance.

One full turn is too much. Try in steps of 1/8 each day for exact tuning. Else try 1/4 or 1/2 max. 1 full turn will lean out mixture too much causing overheating of engine.. Btw, note the number of turns of the screw to ensure you revert back to stock setting in case it goes haywire..

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**anand roy** · 04-05-2015, 09:20 PM

Re: Suzuki Gixxer 155

Originally posted by John P Daniel View Post

One full turn is too much. Try in steps of 1/8 each day for exact tuning. Else try 1/4 or 1/2 max. 1 full turn will lean out mixture too much causing overheating of engine.. Btw, note the number of turns of the screw to ensure you revert back to stock setting in case it goes haywire..

Sent from my C6903 using xBhp Connect mobile app

+ 1 to that, followed by extremely slow turns. If possible have a mech shop near by just in case something gets messed up.

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**Dynamo** · 04-05-2015, 10:21 PM

Re: Suzuki Gixxer 155

Originally posted by anand roy View Post

+ 1 to that, followed by extremely slow turns. If possible have a mech shop near by just in case something gets messed up.

Sent from my Micromax AQ4501 using xBhp Connect mobile app

Yeah sure. I'll try 1/2 turn tomorrow. But I used to clean, tune my pervious bike TVS star city for many years. Even I changed clutch plates for my start city.

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