[shyn]

Has anyone here experimented with alternate rear sprockets for the D390?
My bike will be due for replacement of the chain and rear sprocket soon and was considering other options like 43T (which apparently smoothens out all the jerkiness) or 46T/47T (for more acceleration over top speed).
I could find the said sizes with Tyga Performance and can have someone carry it from the US. But I would like to hear from the experts here first.
Also, are there options to source them locally?
And what about the chains for the respective sprockets? Because Tyga seems to be selling the sprockets only.
http://tyga-performance.com/index.php?view=all&cPath=72_1142_1160_1202

[Urban_Nomad]

^^ I plan to put the front sprocket of Duke 250 (14 teeth) to improve acceleration and bottom end response. A friend has it and is very happy with it. It’s almost like going 2-3 teeth up on the rear, with the advantage of not needing a new chain. And the mod is dirt cheap, couple of hundred rupees or so

[VijayAnand1]

Originally Posted by Urban_Nomad

^^ I plan to put the front sprocket of Duke 250 (14 teeth) to improve acceleration and bottom end response. A friend has it and is very happy with it. It’s almost like going 2-3 teeth up on the rear, with the advantage of not needing a new chain. And the mod is dirt cheap, couple of hundred rupees or so

Lovely! Just at the right time. Was wondering how has the overall experience of your friend has been, apart from improvements in acceleration, has the under-gearing reduced the top speed or stresses the engine on the upper RPM band? And you're right, wiser and cheaper to change the front sprocket, and it works.

Cheers!
VJ

[Urban_Nomad]

Originally Posted by VijayAnand1

Lovely! Just at the right time. Was wondering how has the overall experience of your friend has been
Cheers!
VJ

Well, he absolutely loves it. To quote him - this is how the bike should have come from the factory

He has other mods on his bike also. He mostly uses his bike for off-road use and the in between highway ride

Hope this helps

[ashwinprakas]

Originally Posted by Urban_Nomad

^^ I plan to put the front sprocket of Duke 250 (14 teeth) to improve acceleration and bottom end response. A friend has it and is very happy with it. It’s almost like going 2-3 teeth up on the rear, with the advantage of not needing a new chain. And the mod is dirt cheap, couple of hundred rupees or so

Part Number: DV101048

Rs. 162/-

14T Front Sprocket, the exact same one seen on all motorcycles even remotely related to Bajaj with a .520 pitch setup.

[shyn]

Originally Posted by Urban_Nomad

^^ I plan to put the front sprocket of Duke 250 (14 teeth) to improve acceleration and bottom end response. A friend has it and is very happy with it. It's almost like going 2-3 teeth up on the rear, with the advantage of not needing a new chain. And the mod is dirt cheap, couple of hundred rupees or so

That is genius!
I am surely going to consider it. Thank you so much for the top tip!

Originally Posted by Urban_Nomad

Well, he absolutely loves it. To quote him - this is how the bike should have come from the factory



He has other mods on his bike also. He mostly uses his bike for off-road use and the in between highway ride

Love the front spoke wheel. What size is that? And where did he source it from and how much did it cost?

[Gordon]

Since the bike was not rideable, it lay unused while we performed our checks with the various stuff I purchased online - scanners, multimeter, kick stand bypass, etc.



Signed up for Orange Assist, got the bike towed to service center. The experience was quite smooth with the Orange Assistants calling me time and again to check if the towing agent had reached me.





Diagnosed as faulty fuel pump and needed replacement. Upon replacing the fuel pump, the bike is super smooth.

Glad no other faults were found, everything else is in order. My checks were correct. The local mechanic who had checked the fuel pump couldn't determine for sure if the pump had indeed failed since it was sending fuel to the engine, just not enough and consistent.



She's back and READY TO COMMUTE.

[ashwinprakas]

Originally Posted by Gordon

Diagnosed as faulty fuel pump and needed replacement. Upon replacing the fuel pump, the bike is super smooth.

Glad no other faults were found, everything else is in order. My checks were correct. The local mechanic who had checked the fuel pump couldn't determine for sure if the pump had indeed failed since it was sending fuel to the engine, just not enough and consistent.

She's back and READY TO COMMUTE.

Good to know that after the long break she's back to running fine.

How did they confirm that it was the fuel pump at fault? Asking as IIRC The OBD read done earlier didn't show fuel pressure data.

[Gordon]

Hmm not aware how they reached this conclusion. I was not present at the service center when the checking was done. But I believe that the check may have been done manually, since he said that although the pump starts when the ignition is on, it doesn't get primed properly thereafter. Once they changed the pump it worked without a miss.

[ashwinprakas]

Originally Posted by ashwinprakas

Part Number: DV101048

Rs. 162/-

14T Front Sprocket, the exact same one seen on all motorcycles even remotely related to Bajaj with a .520 pitch setup.

Hey guys, there seems to have been an error on my part;

Pulsar .520 pitch sprockets are interchangeable with only the Duke 200 and not the Duke 250/390 as the latter motorcycles have a different (but similar between 250 and 390) spline design.

Attaching original reply by S1d;



JT Sprockets

[VijayAnand1]

Originally Posted by Gordon

Since the bike was not rideable, it lay unused while we performed our checks with the various stuff I purchased online - scanners, multimeter, kick stand bypass, etc.
.

Lovely Gordon.
Glad to see she's finally back. Just like I'd predicted earlier with the what ifs, it was the fuel pump, great to see it running without hiccups. The problem with the SVC personnel is NOT properly equipping themselves with the right equipments. If they'd checked your fuel pump pressure, that is 42 PSI for the 390s they'd have clearly identified the issue way earlier than whats and ifs which in the end leave with a confused customer without knowing the next recourse.

Mild fuel pump "pressure" issues won't throw up as error in the Diagnostic Tool. If there is voltage fluctuations in the pump then it'd send an error code to be stored. i.e. lesser than adequate power supply and or terminals cut, in that way the ECM throws an error code. But, with a slowly degrading pump, that doesn't maintain constant pressure and or varies the pressure at times, the ECM won't register any fault per se w.r.t to the pump but the user would feel missing, and hesitant performance. Clogged pump filter membrane to weak pump motor are the probable causes.

Long story short! Keep your observation keen for a week with high speed sprints so that everything's okay and she doesn't miss a beat.

Cheers!
VJ

[K a s h]

Originally Posted by ashwinprakas

Hey guys, there seems to have been an error on my part;

Pulsar .520 pitch sprockets are interchangeable with only the Duke 200 and not the Duke 250/390 as the latter motorcycles have a different (but similar between 250 and 390) spline design.

So is the part number DV101048 you posted earlier, still correct for Duke 250?

[ashwinprakas]

Originally Posted by K a s h

So is the part number DV101048 you posted earlier, still correct for Duke 250?

Unfortunately not, the Duke 250 and Duke 390 has a different spline pattern than the Duke 200 and Pulsar's.

[K a s h]

Originally Posted by b16h22

Has anybody tried the 2017 Duke 390 sintered pads and Master cylinder in our old brake setup?

Anyone tried using the new OEM sintered brake pads on older dukes?

[VijayAnand1]

Originally Posted by K a s h

Anyone tried using the new OEM sintered brake pads on older dukes?

Yes, they are a direct fit and they improve the braking to quite an extent. The old spongy, extremely hard pressed feedback is very much improved with the new SS pads.. The brakes offer excellent feedback and bite very well. A worthy upgrade to the old pads.

Cheers!
VJ