Bajaj Dominar 400 Ownership Experience Thread

[sanjeet286]

I generally change the air filter every 6months, esp since its 260 bucks or something, and some of the engine performance issues in this thread have been resolved by changing this filter. Spark plugs and Throttle body can be looked at in the owners manual. But I think that can also be done every 15k Kms.

I used thr STP FI cleaner for my bike.. Used 3 times every 5k Kms and it seemed nice. But I have read that you can keep the engine clean by using a premium fuel (such as shell premium) once every 4 full tanks.

[V 12]

Hey guys I have been facing a weird sort of problem with my bike(July 2017) lately. As soon as I hit the highways and come into 5th or 6th gear and cross speeds of around 70kmph my check engine oil light pops up. Do you guys have any idea what might be causing this issue. I have checked the engine oil and it is present in sufficient quantity and can be seen from the window.

[J_ARTLY]

Additives won't make an engine smooth. Continue to use premium fuel if you prefer since they have additives already. Otherwise, it's the same exact fuel with extra marketing to make more money out of a regulated product.

Any smoothness you feel on adding additives is mostly inside your head. I feel my bike runs smoother on regular petrol.

I tried using liqui moly benzene tec additive. I feel the difference after half fuel tank is consumed. Bike feel more peppier. Throttle response is smooth. I used 3.5 ml/litre. Especially what is improved is low speed riding in higher gears. Jerks and knocking is minimized not totally gone. Now i can do as low as 55 to 60 kmh in 6th gear without any knocking.

[sanjeet286]

Hey guys I have been facing a weird sort of problem with my bike(July 2017) lately. As soon as I hit the highways and come into 5th or 6th gear and cross speeds of around 70kmph my check engine oil light pops up. Do you guys have any idea what might be causing this issue. I have checked the engine oil and it is present in sufficient quantity and can be seen from the window.

Maybe some trouble with the oil pump. Else check if you have enough oil (assuming there has been no oil leak). You are using thr right grade of oil right? 10W-50?

[B7ACKTHORN]

Hey guys I have been facing a weird sort of problem with my bike(July 2017) lately. As soon as I hit the highways and come into 5th or 6th gear and cross speeds of around 70kmph my check engine oil light pops up. Do you guys have any idea what might be causing this issue. I have checked the engine oil and it is present in sufficient quantity and can be seen from the window.

Probably a faulty oil pressure sensor. If you have checked the engine oil level, and it's as per spec and the error throws up at particular RPM or speed, chances are high that you might have a faulty oil pressure sensor. It's recommended that you double check your oil level by draining it at the SVC and ruling out any chances. Good luck.

Cheers!
VJ

[V 12]

Probably a faulty oil pressure sensor. If you have checked the engine oil level, and it's as per spec and the error throws up at particular RPM or speed, chances are high that you might have a faulty oil pressure sensor. It's recommended that you double check your oil level by draining it at the SVC and ruling out any chances. Good luck.

Cheers!
VJ

I have a similar feeling too. Also the case has got a little bit weirder, while on a short sunday ride to a nearby dhabha (45km single side), while going as usual the light pops up and i continue riding. Although while returning back I am riding at constant speeds between 80-90 and no light pops up. I even push the bike to 100kmph to check but still the sensor or the pump works fine. Also which i forgot to add before was as soon as i turn off the ignition and turn it back on their is no error light displayed.

[kiran2508]

Probably a faulty oil pressure sensor. If you have checked the engine oil level, and it's as per spec and the error throws up at particular RPM or speed, chances are high that you might have a faulty oil pressure sensor. It's recommended that you double check your oil level by draining it at the SVC and ruling out any chances. Good luck.

Cheers!
VJ

I have a similar feeling too. Also the case has got a little bit weirder, while on a short sunday ride to a nearby dhabha (45km single side), while going as usual the light pops up and i continue riding. Although while returning back I am riding at constant speeds between 80-90 and no light pops up. I even push the bike to 100kmph to check but still the sensor or the pump works fine. Also which i forgot to add before was as soon as i turn off the ignition and turn it back on their is no error light displayed.

Even if the oil level is not decreasing and not burning, the problem could be not enough oil is reaching the HEAD where the sensor sits.

The oil pressure sensor used are 1.15bar sensor. If the Sensor was at fault, it would not have turned off again automatically after 80-90, once the sensor current circuit line is open, it would go no off until you cut power to it with ignition key on-off. So my hunch is sensor is fine.

If oil levels are fine then could be clogged oil jets in the head guide or a clogged oil pump line or a weak main Oil pump or weak Evacuation pump.
Clean the jets and oil lines with compressed air, clean the oil pumps and gears, change the sensor. Replace the pumps if needed, sensor is only Rs.150 and oil pump doesn't cost more the Rs.400 each if they are worn out.

[B7ACKTHORN]

I have a similar feeling too. Also the case has got a little bit weirder, while on a short sunday ride to a nearby dhabha (45km single side), while going as usual the light pops up and i continue riding. Although while returning back I am riding at constant speeds between 80-90 and no light pops up. I even push the bike to 100kmph to check but still the sensor or the pump works fine. Also which i forgot to add before was as soon as i turn off the ignition and turn it back on their is no error light displayed.

There have been cases where the oil pressure switch has been replaced due to faulty readings, many a KTM 390s have suffered this issue.

Cheers!
VJ

[V 12]

Even if the oil level is not decreasing and not burning, the problem could be not enough oil is reaching the HEAD where the sensor sits.

The oil pressure sensor used are 1.15bar sensor. If the Sensor was at fault, it would not have turned off again automatically after 80-90, once the sensor current circuit line is open, it would go no off until you cut power to it with ignition key on-off. So my hunch is sensor is fine.

If oil levels are fine then could be clogged oil jets in the head guide or a clogged oil pump line or a weak main Oil pump or weak Evacuation pump.
Clean the jets and oil lines with compressed air, clean the oil pumps and gears, change the sensor. Replace the pumps if needed, sensor is only Rs.150 and oil pump doesn't cost more the Rs.400 each if they are worn out.

It never turned off automatically, what actually happened was whilst going back since turning on the bike the light never popped up as it usually does when i hit 70kmph.
You have shed a lot of info about what could be the problems. I'll get all of them rectified just to be sure and leaving nothing on chance. Thank you for helping me out.

Ride hard ride safe
Amogh Sharma

[ashislakra1989]

Hi xhbhpians,

I have d400 ug19 purchased aug 19.
I want to know about when should be
1. Air filter changed ?
2. Spark plugs cleaned ?
3. Throttle body cleaned ?
As my running is very less bike has clocked around 5600 kms on odo. All the riding is in urban conditions and paved roads no off roading means less dirty conditions.
Last service or third free service was done on around 3800 kms oil and oil filter were changed. Now according to bajaj app service is due in first half of dec.
And any reviews regrding fuel additive like Stp octane booster or liqui moly. I usually fill up premi2 fuel extra premium or speed only but i am not satisfied with refinement still feel some vibrations and harshness in engine. Does these additives do their job as mentioned in reviews.
TIA.

I've tried liqui moly additives and ran almost 2800 kms , not that much difference in smoothness / refinement but yes vibes will be present & harshness will be there. It's always there.

[ashislakra1989]

I tried using liqui moly benzene tec additive. I feel the difference after half fuel tank is consumed. Bike feel more peppier. Throttle response is smooth. I used 3.5 ml/litre. Especially what is improved is low speed riding in higher gears. Jerks and knocking is minimized not totally gone. Now i can do as low as 55 to 60 kmh in 6th gear without any knocking.

Using Premium petrol helps a lot and knocking is reduced for sure.

[kiran2508]

I've tried liqui moly additives and ran almost 2800 kms , not that much difference in smoothness / refinement but yes vibes will be present & harshness will be there. It's always there.

I'm not sure who started the trend of using additives on bike with such low kms, most Indian bikes are designed for 87-91 octane fuel, ignition timing and knock sensors are tuned to function in the same range and anything higher octane might cause more wear and sensors might not catch a knock.

If you using Bajaj oil, throw the old oil(without using engine flush) and switch to Motul 10W50. Another thing, the bike will feel harsh if you have less than 30-40% fuel, try the same with full tank of fuel, you'll see the bike perform becoming so much smoother and linear!

[Greymatter]

Anybody tried installing D400 UG dual port exhaust muffler in 2018 D400? Is it a straight fit or requires any major alteration?

[V 12]

Anybody tried installing D400 UG dual port exhaust muffler in 2018 D400? Is it a straight fit or requires any major alteration?

There have to be major mods as 2018 had an underbelly cat whereas 2019 onwards cat is incorporated inside the muffler. You'll have to change the whole system and still you would not get the required bass(assuming you are looking for a bassy sound from your bike) as 2019 has a DOHC setup whereas 2018 has sohc setup and lots of varying internals and parameters.

[leedonotrix]

Hi!

Need some advice and help. Have been having a weird problem in my 2017 Dominar. The coolant goes from Max to Min in about 2-3 months. The service centre guys in Kirti Nagar, Delhi changed the seal in October and told me that it was good to go but when it happened again they told me they need to open up the engine and clean the engine entirely as the coolant is leaking into the engine. I understand that they may need to do it if the coolant is mixing with the engine oil as that can be fatal for the engine but I still don't get as to how that is going to solve the problem of the coolant leakage. Also, a 3 year old bike needs to get its engine opened? Isn't that sad? Should I report this to Bajaj directly?

Thanks.