Re: Is my bike running lean?

Many thanks for taking a look. The white porcelain is the reason i myself got confused [emoji20]. I belive it should appear as light brown or something in a healthy engine with proper combustion.
Yes bro, i made full 360 degree turn.
The RHS spark plugs photo attached. Appreciate your support [emoji4]

Re: Bajaj Pulsar 150 All Versions

The LHS plug, does it tell any different story? Hope im not on the lean side [emoji20]

Re: Bajaj Pulsar 150 All Versions

Yes, you are way too lean and that clearly shows an over heating engine. It could also be caused due to bad quality adulterated fuel (i've seen a similar color when i used some local fuel sold in bottles on roadside -was during an emergency)
Also are you using the correct recommended spark plug or some other plug ?

Take the bike to a mech or asc and get the spark plug, petrol tank and carb cleaned and tuned correctly. If it doesn't work out, replace the plugs with stock plugs and check.

Re: Bajaj Pulsar 150 All Versions

I will check the carb at next service. The plugs are bajaj recommend champion series rg4hc.

Re: Bajaj Pulsar 150 All Versions

how far away is the next service ? you might do more damage to the engine and incur more expenses later on if you neglect it.
I see your location is B'desh, so am not sure about the service availability in your region.. but do try to get it fixed asap.

Re: Bajaj Pulsar 150 All Versions

Dude your lean plus what rubbish petrol your running it on? Eventualky the electrode will start eroding or deforming. Can you go richer...I mean way richer? Just visit a mech buddy clearly your not being able to get it to a good afr. Also a good idea woukd be to turn the fuel screw(il post a pic in the evening in anticlock direction... to open more fuel into the carb...)

Divyansh....

Re: Bajaj Pulsar 150 All Versions

Im get my bike fueled up in that gas pump, supposedly sells good quality oil.
I also see some loss in mileage? Do you think I should change spark plug and see if that helps? Engine also vibrate when hot, and performance decrease, but during morning after initial engine warm up, the bike seems good acceleration and speed and less vibration. Im really confused mate. Im on 5th 360 turn. ( from 4.5) i will post if it helps any. But also appreciate the picture you will share. Thankz

Re: Bajaj Pulsar 150 All Versions

Also if you happen to know the default / stock turn of volume screw.. I think it is 2.5 turn!!

Re: Is my bike running lean?

Dude i own a UG4.5 Pulsar 150 and the bike redlines even while running on one spark plug be it right or left.
I checked it by removing terminal cap on plugs one at a time.(It was done on a hot engine)
I think newer generation pulsars don't have it..
Can a few other members verify the same....

Re: Is my bike running lean?

UG4.5 is the latest in terms of mechanical changes till now available in the market and yes it does red line the same way........

Re: Is my bike running lean?

Maybe u r right maybe not.
what if the cdi is 'intelligent' enough to ensure at least one plug fires all the time ? (since you say you tried with disconnecting one, maybe the cdi senses this and ensures the other plug continues to fire)
Just speculation from my end... can't say for sure unless I get to read one of the latest service manuals where it might hopefully be explained. But from what i read and posted from one of the earlier manuals, it only talks about the firing when both the plugs are connected and i think even the ug4.5 should be having something similar if not the exact same rpm cut offs. This was discussed on the p180 thread, and i do not want rake up another coffee toffee discussion

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Yeh that's around what is set at the factory..between 2.5-3.5 turns.
Now i dont know the history behind what made you change the carb setting in the first place ? Did you do any mod or play around and then try to set it back to normal ?
Below is the pic of a pulsar carb.. IF you want to try it your self...
the one circled in red is the afr adjustment screw, turn it clock wise all the way in (just till u feel its seated/closed, DON'T over tighten it).. next unscrew it i.e. anticlockwise 3 full turns (i.e. three 360 turns.. i hope you are really doing a 360 and not a 180) - now check plugs after running 2-3km.
but before you do the above, please CLEAN out the tank and fill petrol from a different bunk, and also clean the spark plug to remove those white deposits.If you dont clean out the white deposits, it will continue to run hotter.


But do go over what i recommended earlier step wise, and get it fixed asap, preferably from your ASC since you might be covered under warranty and push them to sort out the troubles.

I am not sure what [MENTION=66664]Divyanshp150[/MENTION] is trying to say... first he says its perfectly ok and then he decides it lean and rubbish fuel.

Re: Is my bike running lean?

Thankz for sharing the photo and pardon my ignorance, i changed the plug a week ago, do you think because of that the porcelain still look whitish? I was running 6 full 360 turn from fully tighten position and saw the bike runs cooler and the spark plug around the ring looks more on black side ( it was dark coffee color before) but the porcelain still white! I ran on those new spark plug like 100km or less. But i will fill up the tank, set the afr screw at 3 turn (full) and run few kilometers. And will post the result.
Beside, i have decided i will take the bike to bajaj authorised dealer for services on parts listed below :

* carburetor clean and tune
* spark plug check and replace if necessary (i wonder if i purchased the duplicate ones)
* i dont see any decrease in engine oil volume, so i believe no need to check piston or inside the engine)
* however, timer chain seems lose, it makes tik tik sound at idle sometimes so maybe ask them to replace and tappet adjust.
The bike has ran 21566 km. Should i mention any other parts to be checked and replace? I appreciate your help and suggestions

Re: Is my bike running lean?

Clean the plug before you do any test.. by clean i mean the center and ground electrode (the small metal projections at the end of the plug)
yeh, there is a possibility that you are using a fake or wrong plug.

21k km is too early for timing chain replacement.. just get the valve clearances (tappet adjustment) done. There is a video a couple of pages ago showing how a full service is done and what all are supposed to be done.. pls do watch it.

Re: Is my bike running lean?

Thankz mate. Thats very helpful of you. I turned afr screw full three 360 all the way ran about 10-15km and checked the plug and took a photo of LHS plug. What you think? Any sign of improvement?

Re: Is my bike running lean?

Firstly pl try to clean out the petrol tank and fill from a different pump
Did you clean the plug before riding the 10-15km ?
If you did, then again clean it and increase half a turn i.e. 180.. max go to 4 turns.. if not buy new plugs and check again.