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**MotoMan** · 07-04-2019, 07:07 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Went on a 300+ KM (to & fro) road trip to KODIKUTHIMALA. A beautiful place situated in Malappuram district of Kerala. It's a serene and less crowded spot.
There is a light trek to the view point. It is the first long trip after engine work and I got a mileage of 56 kmpl while the average speed was 70kmph. Not bad I guess

.

Your's truly,

Motoman

**nitishlaghate** · 07-05-2019, 12:32 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by nitishlaghate View Post

Help needed!!

I am having Hero HF Deluxe i3s March 2018 BSIV model. Done 7000 kms and 4 services.

Before 1st service I was getting a mileage of 71-73 kmpl. After 1st service it went down to 68-70 kmpl. After 2nd service it went down to 63-65 kmpl. After 3rd it was down to 58-60 kmpl. And now after the 4th service its down to 52-53 kmpl.

Air cleaner is in perfect condition. Clean it with compressed air every 15 days. Carburetor is tuned perfectly by myself. Tappet clearance checked. Chain is lubed and adjusted properly. Wheel movements are free.

Daily usage is approx. 20 kms, out of which 15 kms is highway usage and 5 kms is in city with very light traffic. Driving style is very calm and usual speeds are in the range of 30 - 50 kmph. The bike is used only by me.

I am unable to figure out the problem of low FE. Need help from expert members like Sibun ji.

With my driving style, I am able to extract 60-62 kmpl FE from my 11 years old Yamaha Gladiatior RS which has clocked 80k kms.

I wonder how a bike which is famous for its great FE is giving such a low FE.

Guys please help

**MotoMan** · 07-05-2019, 04:36 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by nitishlaghate View Post

Spark plug is in good condition. Clean it once a month. Yes, basically being a mechanical engineer I service it myself, but the first two services were done at Hero authorised service centres as I had bo time. Even though everything is in good condition, I am getting very low FE. Unable to figure out the reason.

1. Please check the tyre air pressure.

2. Did the service centre change the engine oil at each service ? If no then change it immediately. The Hero 4T plus 10w30 is famed for its ultra low life of just 1000 km.

The ASC recommends to change it every 3000km and in your manual, it will be 6000km! This oil will give you very good mileage but you should strictly drain it at 1500-1800km.

3. Does your bike start at the very first crank in the morning? Because if the tuning is perfect then it should start at first crank with or without choke.

The spark plug should look something like this-

My plug is Bosch UR4AC. The ASC is providing Champion PRZ7HC I guess. If it is champion plug then replace it with earlier mentioned Bosch or NGK CR6HSA / CR6HGP.

The Champion plug deteriorates very fast. This may be a cause for the low mileage.

These are a few things that I would suggest. A perfectly maintained HF/CD-deluxe should deliver 70-80 kmpl easily as it is the lightest bike on this platform.

**nitishlaghate** · 07-05-2019, 04:59 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by MotoMan View Post

1. Please check the tyre air pressure.

2. Did the service centre change the engine oil at each service ? If no then change it immediately. The Hero 4T plus 10w30 is famed for its ultra low life of just 1000 km.

The ASC recommends to change it every 3000km and in your manual, it will be 6000km! This oil will give you very good mileage but you should strictly drain it at 1500-1800km.

3. Does your bike start at the very first crank in the morning? Because if the tuning is perfect then it should start at first crank with or without choke.

The spark plug should look something like this-

[ATTACH]250306[/ATTACH]
[ATTACH]250307[/ATTACH]

My plug is Bosch UR4AC. The ASC is providing Champion PRZ7HC I guess. If it is champion plug then replace it with earlier mentioned Bosch or NGK CR6HSA / CR6HGP.

The Champion plug deteriorates very fast. This may be a cause for the low mileage.

These are a few things that I would suggest. A perfectly maintained HF/CD-deluxe should deliver 70-80 kmpl easily as it is the lightest bike on this platform.

Thanks for the reply!

The tyre pressure is correct. Get it checked every 15 days.

Engine oil has been changed at every service. Used the Hero oil only during first service. Other than that, always used Motul 20w50.

The bike does start at first kick without choke. I warm it up for one minute everyday.

I had also replaced the spark plug 600 kms back. Bought it from the ACS itself.

**MotoMan** · 07-05-2019, 06:43 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

I think that's the culprit of the mileage issue. 20w50 grade is a strict no-no for hero bikes. It's just too thick and robs away performance and mileage. It can also cause engine damage in the long run. The ideal grade is 10w30 / 10w40. Try motul /castrol 10w30, the issue will be solved.

EDIT :
Hero is using super tight clearences from 2010/bs3 models and even tighter clearence for bs4 models. And these take almost 15-20k km to run in properly [emoji43]. Hence a 20w grade is not suitable in this period.

The old/pre-2010 model bikes can run on any grade of oil but it is not the case with the newer ones.

**MotoMan** · 07-08-2019, 08:12 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Changed the engine oil today. Bike had become harsh after the malappuram ride.

**MotoMan** · 07-08-2019, 08:22 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

I am using the Hero recommended / popularly most not recommended hero 4t plus, now with API SL rating. Earlier I used castrol activ 10w30 and it performed brilliantly. Now let's see how this performs.

Removed the gear shifter for convinience. Now I am making it a habit to change the aluminium washer with every oil change. It would be easier if you have a socket wrench and a funnel [emoji28].

Motoman.

**ashwinprakas** · 07-08-2019, 09:10 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by MotoMan View Post

It would be easier if you have a socket wrench

Why not use the stock tool provided in the tool kit, it's just as good as any 6 point socket, not to mention reduce the chance if deforming drain bolt compared to using C spanner or 12 point ring spanner.

**#bpk** · 07-08-2019, 11:18 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by ashwinprakas View Post

Why not use the stock tool provided in the tool kit, it's just as good as any 6 point socket, not to mention reduce the chance if deforming drain bolt compared to using C spanner or 12 point ring spanner.

Are you referring to the spark plug opener socket provided with the tool kit [MENTION=20978]ashwin[/MENTION] bro ?

**ashwinprakas** · 07-08-2019, 11:46 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by #bpk View Post

Are you referring to the spark plug opener socket provided with the tool kit @ashwin bro ?

Yeah bro, one side for SP the other for Drain Nut.

**MotoMan** · 07-09-2019, 09:59 AM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

The truth is I totally forgot about the 17 size spark plug socket. Maybe I have developed a habit of using the ring spanner!

**[email protected]** · 07-09-2019, 10:01 AM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by MotoMan View Post

I am using the Hero recommended / popularly most not recommended hero 4t plus, now with API SL rating. Earlier I used castrol activ 10w30 and it performed brilliantly. Now let's see how this performs.

Removed the gear shifter for convinience. Now I am making it a habit to change the aluminium washer with every oil change. It would be easier if you have a socket wrench and a funnel [emoji28].

Motoman. [ATTACH]250318[/ATTACH][ATTACH]250321[/ATTACH][ATTACH]250322[/ATTACH][ATTACH]250323[/ATTACH][ATTACH]250324[/ATTACH][ATTACH]250325[/ATTACH]

Bro what is interval you changed the oil and is there is any decrease in oil level during drain period

**MotoMan** · 07-09-2019, 10:31 AM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by [email protected] View Post

Bro what is interval you changed the oil and is there is any decrease in oil level during drain period

I change it in between 1.5k-2k km. It's the point where the oil starts to loose it's viscosity and you start to feel slight harshness. There is no drop in oil level.

**nitishlaghate** · 07-09-2019, 04:37 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by MotoMan View Post

I think that's the culprit of the mileage issue. 20w50 grade is a strict no-no for hero bikes. It's just too thick and robs away performance and mileage. It can also cause engine damage in the long run. The ideal grade is 10w30 / 10w40. Try motul /castrol 10w30, the issue will be solved.

EDIT :
Hero is using super tight clearences from 2010/bs3 models and even tighter clearence for bs4 models. And these take almost 15-20k km to run in properly [emoji43]. Hence a 20w grade is not suitable in this period.

The old/pre-2010 model bikes can run on any grade of oil but it is not the case with the newer ones.

Thanks. I will change it tomorrow itself and post the results in few days.

**ashwinprakas** · 07-09-2019, 09:38 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by MotoMan View Post

The truth is I totally forgot about the 17 size spark plug socket. Maybe I have developed a habit of using the ring spanner!

Same here, If it weren't for the GQ ride where space was a concern I wouldn't have found out how convenient it is to use the tool provided with the motorcycle.

Beats the effort needed to use box spanners or a torque wrench as leverage is low enough that unless you're Arnold Schwazznigger you'd not have the strength to ruin the crank case threads.

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