Bajaj Dominar 400 Ownership Experience Thread

[VIGNESH.G.S]

Re: Bajaj Dominar 400 Ownership Experience Thread

I want to remove the exhaust and ride the bike with that underbelly only.Will that lead to any problem with my engine.

[Traveller01]

Re: Bajaj Dominar 400 Ownership Experience Thread

A couple of weeks back took the Dominar 400 to some off roads. The bike behaved well, actually more than what I had expected. When I did the ride I was not aware about the alloy cracking/bending issue which is in news now, So I didn't worry at that time & the bike was kind of abused on off roads. No problems/issues faced even when ridden is mud & slush apart from mud sprayed all over the rear part, a rusty & very dirty chain (which is very much expected).
My friend & I have missed & gone over many potholes at 50-60kmph with no effect on the alloys. I am not here to give any verdict on the alloy issues or for taking Bajaj's side (I own an Apache), just wrote down what I have experienced on this bike.

[deepDmnr]

Re: Bajaj Dominar 400 Ownership Experience Thread

I want to remove the exhaust and ride the bike with that underbelly only.Will that lead to any problem with my engine.

If the stock exhaust contains the catalytic converter which I think it does, it would defeat the point of buying BS4 spec engine. It might also be illegal to ride without any exhaust. But you can technically.

[Traveller01]

Re: Bajaj Dominar 400 Ownership Experience Thread

I want to remove the exhaust and ride the bike with that underbelly only.Will that lead to any problem with my engine.

Yes it will lead to many problems starting with fried valves.

[benz]

Re: Bajaj Dominar 400 Ownership Experience Thread

Yes it will lead to many problems starting with fried valves.

How it will fry the valve.?please explain

[Traveller01]

Re: Bajaj Dominar 400 Ownership Experience Thread

How it will fry the valve.?please explain

If we remove the exhaust then there will be no back pressure. Modern day close loop FI system are designed to negotiate the a/f ratio to some extend but when you remove the exhaust the system starts running lean. Leaner mixture leads to hotter engine. Most of these heat is transfered to the piston head & valves. However the intake valves gets some cooling due to the fresh charge entering the combustion chamber but no such cooling on the exhaust valves. Hence chances of burnt piston head & valves are high when running without exhaust.

P.S: Tried this on a Pulsar 150 the street dogs didn't liked it [emoji3]

[D4004]

Re: Bajaj Dominar 400 Ownership Experience Thread

If remove the exhaust then there will be no back pressure. Modern day close loop FI system are designed to negotiate the a/f ratio to some extend but when you remove the exhaust the system starts running lean. Leaner mixture leads to hotter engine. Most of these heat is transfered to the piston head & valves. However the intake valves gets some cooling due to the fresh charge entering the combustion chamber but no such cooling on the exhaust valves. Hence chances of burnt piston head & valves are high when running without exhaust.

P.S: Tried this on a Pulsar 150 the street dogs didn't liked it [emoji3]

Traveller01 I agree this would definitely be the case with a P150, 200, 220, NS, AS and all others that run on a carburetor based engine setup.

But there's absolutely no chance of the valves getting fried here as the Dominar is a Fuel Injected bike. Valves can only get fried if there is misfiring or backfiring that is caused due to mismatch in adequate amounts of air and fuel mixtures within the engine and this happens only in carburetor based bikes such as most of our Indian bikes below 250cc (excluding the FI based one's in this cc range category like the CBR, R15 of course)

Running the bike without the extended silencer will in no way whatsoever affect the Dominar's engine or capabilities but yes, it will definitely be illegal to ride and effect the atmosphere with more poullutants as the catalytic converter is generally within the exhaust system and that's what keeps the carbon footprint of your vehicle to a minimum.

But in all honesty, I agree with Traveller01 and others and would recommend you to keep the stock silencer or replace it with another instead of not having a silencer at all.

[$Cj]

Re: Bajaj Dominar 400 Ownership Experience Thread

Traveller01 I agree this would definitely be the case with a P150, 200, 220, NS, AS and all others that run on a carburetor based engine setup.

But there's absolutely no chance of the valves getting fried here as the Dominar is a Fuel Injected bike. Valves can only get fried if there is misfiring or backfiring that is caused due to mismatch in adequate amounts of air and fuel mixtures within the engine and this happens only in carburetor based bikes such as most of our Indian bikes below 250cc (excluding the FI based one's in this cc range category like the CBR, R15 of course)

Running the bike without the extended silencer will in no way whatsoever affect the Dominar's engine or capabilities but yes, it will definitely be illegal to ride and effect the atmosphere with more poullutants as the catalytic converter is generally within the exhaust system and that's what keeps the carbon footprint of your vehicle to a minimum.

But in all honesty, I agree with Traveller01 and others and would recommend you to keep the stock silencer or replace it with another instead of not having a silencer at all.

I too want this kind of mod... Underbelly exhaust seems cool to me.. Will NS 200 exhaust in D400 will solves the above problems?

[Traveller01]

Re: Bajaj Dominar 400 Ownership Experience Thread

Traveller01 I agree this would definitely be the case with a P150, 200, 220, NS, AS and all others that run on a carburetor based engine setup.

But there's absolutely no chance of the valves getting fried here as the Dominar is a Fuel Injected bike.

But in all honesty, I agree with Traveller01 and others and would recommend you to keep the stock silencer or replace it with another instead of not having a silencer at all.

[MENTION=92507]D4004[/MENTION]
There is always a range to which the ECU compensates by changing the air/fuel ratio after which the stock ECU maps are incapable of making the right changes. This is the reason why superbikes get there ECU remapped after a full exhaust system is installed or when there are changes made to the intake.
Thanks for adding up the emission point which I totally skipped.

[D4004]

Re: Bajaj Dominar 400 Ownership Experience Thread

I too want this kind of mod... Underbelly exhaust seems cool to me.. Will NS 200 exhaust in D400 will solves the above problems?

The new NS BS-IV compatible version should solve the issue of your requirement for the underbelly exhaust system as it has the catalytic converter and all other components within the underbelly exhaust system itself. But I believe it would be difficult trying to procure that part as it has recently been launched and such spares take quite a while to make it to the market. But I still have my doubts regarding the compatibility as the NS is a 200cc carburetor based engine and our Dominar is a 400cc FI monster. So then again U will have to make quite a few tweaks to the exhaust system. Might I recommend trying to use the older 390's underbelly exhaust instead. It should be more compatible as compared to the NS.

[benz]

Re: Bajaj Dominar 400 Ownership Experience Thread

I too want this kind of mod... Underbelly exhaust seems cool to me.. Will NS 200 exhaust in D400 will solves the above problems?

I have been riding without silencer for 4 months and nothing has changed. I don't agree that the valve gets fried. Valves are made of metal and to get that fried temp should reach above 1000. Your engine will shut down much before that.

[D4004]

Re: Bajaj Dominar 400 Ownership Experience Thread

[MENTION=92507]D4004[/MENTION]
There is always a range to which the ECU compensates by changing the air/fuel ratio after which the stock ECU maps are incapable of making the right changes. This is the reason why superbikes get there ECU remapped after a full exhaust system is installed or when there are changes made to the intake.
Thanks for adding up the emission point which I totally skipped.

Your welcome and thank you for mentioning the ECU remapping, I completely forgot to take that into account. You are right, if you don't do a re-map after making a huge physical change such as this, it could affect the bike's performance and components. Nice 1 👍

[benz]

Re: Bajaj Dominar 400 Ownership Experience Thread

I too want this kind of mod... Underbelly exhaust seems cool to me.. Will NS 200 exhaust in D400 will solves the above problems?

I have been riding without silencer for 4 months (in peak summer) and nothing has changed. I don't agree that the valve gets fried. Valves are made of metal and to get that fried temp should reach above 1000. Your engine will shut down much before that.

Maybe I am wrong. Not sure what will really happen.

[shreyas.ka92]

Re: Bajaj Dominar 400 Ownership Experience Thread

Traveller01 I agree this would definitely be the case with a P150, 200, 220, NS, AS and all others that run on a carburetor based engine setup.

But there's absolutely no chance of the valves getting fried here as the Dominar is a Fuel Injected bike. Valves can only get fried if there is misfiring or backfiring that is caused due to mismatch in adequate amounts of air and fuel mixtures within the engine and this happens only in carburetor based bikes such as most of our Indian bikes below 250cc (excluding the FI based one's in this cc range category like the CBR, R15 of course)

Running the bike without the extended silencer will in no way whatsoever affect the Dominar's engine or capabilities but yes, it will definitely be illegal to ride and effect the atmosphere with more poullutants as the catalytic converter is generally within the exhaust system and that's what keeps the carbon footprint of your vehicle to a minimum.

But in all honesty, I agree with Traveller01 and others and would recommend you to keep the stock silencer or replace it with another instead of not having a silencer at all.

What you said is not exactly right. I would suggest you can experiment on any bike.
in under 5000 kms, You will hear the tak tak noise from rocker arms, In about 15000 kms, You will have broken rocker arms and after about 20000 kms, You will have fried Valves and most probably blow by happening.

What ever the inlet technology be, Carb or FI, All 4 stroke engines work in same way and principles.
So any issue happening on a carb bike, the FI biek will have same or atleast similar outcomes and vice versa.
Personal experience with my own P220f, P180, friend's R15 V2 ( this engine is bullet proof, so it lasted more that 50000 kms before the valves were changed) and a 1st gen ZMR ( good engine, Lasted for well over 30k before showing any symptoms)

All the bikes had some or the other free flow exhaust mods.
to be frank, Bajaj engines are not so much refined as the yamaha or honda for that matter and tend to wear very quickly

What i mean to say is, There are adverse affects, We might not see it immediately, but will definitely see it sometime later.

[Leslie Pinto]

Re: Bajaj Dominar 400 Ownership Experience Thread

My wife feels that the D 400 pillion seat is quite hard. Anyone done any extra padding or added gel seats for a bit of comfort?