Announcement

**nishesh.kumar** · 10-22-2013, 11:45 PM

re: CBZ xtreme / Hunk

Thanks Sir, I'll get the gasket and o-ring replaced.
The other issue is development of vertical play in the handle bar, whenever I use front brakes.
What could be the problem?

**SatSon** · 10-23-2013, 08:10 AM

re: CBZ xtreme / Hunk

Originally posted by sinnerz2000 View Post

How's the quality of metal compared to original?

Sent from my F8 using Tapatalk

I've heard that USHA cylinder blocks last longer than OE, atleast in the case of Hero Honda.

----consecutive posts auto-merged-----

Originally posted by vickyrealcool View Post

I think at present bike run on lean mixture, rpm increases fast but very slowly comes down to idle. It slightly hesitates to go above 60, at 60Kmph feels like it is loosing petrol, some vibration is also felt at that speed.
Mileage is OK. I wonder how many owner say that he drive her xtreme @80-90 Kmph.

Wait for your engine to run for another 1000-2000 kms before you start worrying about speeds above 60kmph.
If you find the issue to be disturbing, check with service center on your next service.
IMO, You need not touch the carb yourself now.

Extreme/Hunk can do 90kmph easily, wait for your engine to settle...

**sinnerz2000** · 10-23-2013, 01:11 PM

re: CBZ xtreme / Hunk

Originally posted by SatSon View Post

I've heard that USHA cylinder blocks last longer than OE, atleast in the case of Hero Honda.

----consecutive posts auto-merged-----

Wait for your engine to run for another 1000-2000 kms before you start worrying about speeds above 60kmph.
If you find the issue to be disturbing, check with service center on your next service.
IMO, You need not touch the carb yourself now.

Extreme/Hunk can do 90kmph easily, wait for your engine to settle...

Yea was reading about it, will go for it in case I need a cylinder kit replacement.

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**abhisheklalnediya** · 10-23-2013, 02:06 PM

re: CBZ xtreme / Hunk

I used to close the fuel when ever I park it for more than an hour. Is it a good practice

But lately I am observing that the it hesitates to start when fuel is closed for more than 1~2 hrs. if I left the fuel open or reserve then there is no problem.
I try shaking and opening full throttle, chock.... Chock works but opeing full throttle while starting does not works
Its not a cold start problem as it happens at noon on sunlight too.
I think the fuel is some how escaping through carb.

What should I do

**sinnerz2000** · 10-23-2013, 02:53 PM

re: CBZ xtreme / Hunk

Originally posted by abhisheklalnediya View Post

I used to close the fuel when ever I park it for more than an hour. Is it a good practice

But lately I am observing that the it hesitates to start when fuel is closed for more than 1~2 hrs. if I left the fuel open or reserve then there is no problem.
I try shaking and opening full throttle, chock.... Chock works but opeing full throttle while starting does not works
Its not a cold start problem as it happens at noon on sunlight too.
I think the fuel is some how escaping through carb.

What should I do

I leave it on reserve always, never turned it off, haven't had a problem. You can do the same.

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**Lokesh027** · 10-23-2013, 04:55 PM

re: CBZ xtreme / Hunk

Originally posted by abhisheklalnediya View Post

I used to close the fuel when ever I park it for more than an hour. Is it a good practice

But lately I am observing that the it hesitates to start when fuel is closed for more than 1~2 hrs. if I left the fuel open or reserve then there is no problem.
I try shaking and opening full throttle, chock.... Chock works but opeing full throttle while starting does not works
Its not a cold start problem as it happens at noon on sunlight too.
I think the fuel is some how escaping through carb.

What should I do

Do you see any signs of fuel dropping on floor through overflow tube?( black coloured tube attached at bottom of carb going towards down side). If yes then your float pin (inside carb) is worn out and needs to be replaced.
Moreover you can get your main jet and pilot jet cleaned properly.
Do you see any other signs of leakage?

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**abhisheklalnediya** · 10-23-2013, 07:12 PM

re: CBZ xtreme / Hunk

Originally posted by Lokesh027 View Post

Do you see any signs of fuel dropping on floor through overflow tube?( black coloured tube attached at bottom of carb going towards down side). If yes then your float pin (inside carb) is worn out and needs to be replaced.
Moreover you can get your main jet and pilot jet cleaned properly.
Do you see any other signs of leakage?

Sent from my HTC using xBhp Connect

I don't think its petrol, I can see the tub is wet with some thing hard like oil + dirt.
I don't see any drops on floor, but I can smell petrol when parked at home.

Is the pin easily available? how much does it costs?

**sibun** · 10-24-2013, 12:27 AM

re: CBZ xtreme / Hunk

Originally posted by vickyrealcool View Post

[ATTACH=CONFIG]121983[/ATTACH]I want to tune my bike carb, it ran only 900 kms, is it safe to tune it at 900 kms?Is this tuning screw is correct which is denoted by A.Where is the air pipe between the carb and the head, that a rubber pipe is fitted to carb insulator, and a brass pipe which we have to close it with finger.thanks in advance.

Your bike has run only 900 km and you are thinking about touching the carb. My advice is a strict no. Not only you but even do not let the SVC mechanic touch the carb. From the photo that you have posted the mixture screw position looks correct. No need to fiddle with it. Rpm falls slowly because engine is new so the bike has more friction and also no carbon on head. So wait for engine to free up and head to build some carbon and all your problems will be solved.And tuning carburettor is not easy as i have described. It takes loads of experience to detect the firing of engine and fuel ratio link. It took me almost 5-6 years to learn to tune the carburettor perfectly that too guidance from mechanic and on slide carbs which are easy to detect changes in sound. In CV carb change in sound is difficult to detect and needs lots of experience to tune. A person can rebuilt a engine by looking at pictures and following instructions, but to tune the carburettor will need lots of experience and ability to detect difference in sound.

Originally posted by sinnerz2000 View Post

Can the hunk/xtreme cylinder kit be used on a unicorn?Sent from my F8 using Tapatalk

Yes you can use hunk/extreme bore kit in unicorn, no problem.The problem with UNICORN kit is that to increase mileage and smoothness Honda has given soft rings and more clearance. It helps in having almost zero running-in, mileage from new, and smoothness. If you use Hunk/extreme kit then let me tell you initially the bore will be very tight and engine will feel stressed. Will have to complete 1000 km running-in, mileage will gradually increase after running a bit and also smoothness will increase as you pile on kilometers.Another advantage is that when the new bore kit of unicorn will start smoking after some kilometers the hunk/extreme bore will still feel hard compression.

Originally posted by itsmevini123 View Post

Guys,I have just completed a 1200 kms ride on my Hunk, four of us went to Munsiari and Binsar, Uttrakhand on our bikes, Bikes behaved just flaw less just expect on those extreme up hill roads where every machine struggle a bit due to less air, The path was full of path holes and I must say suspension of the bike managed to eat every hole very well....

Just one question I want to ask is that one of my co rider on FZ had removed his air filter when we reached at hills for more air and power output from the bike, I must say I rode his bike and it was feeling very good simply superb, I also thought to do same with my hunk but didn't do that....Is it safe for our engine to remove the air filter even on hills as we know there air is quit clean....?

No never ride without the air filter. It will damage the bore. If bike is strugling lean the mixture by half a turn and after returning to ground level tune it back to original. If you have a permanent marker mark the original position of screw with the body of carburettor for easy setting.

Originally posted by sinnerz2000 View Post

How's the quality of metal compared to original?Sent from my F8 using Tapatalk

Previously USHA was the OE supplier to HERO, but when conflict between Hero and HONDA started in 2006 vendor was changed. But after partition again vendor has been changed to USHA.I am using USHA bore kit in my Joy. The quality is same that came with my Joy in 2001(man those days when quality takes precedence over price). The piston is semi-forged and has 11% silicon which prevents it expansion when heated.New bore kit for extreme is USHA and the rings are from GOETZE.

Originally posted by nishesh.kumar View Post

Thanks Sir, I'll get the gasket and o-ring replaced.The other issue is development of vertical play in the handle bar, whenever I use front brakes.What could be the problem?

PSR sir has replied on your gasket problem.For handle problem tighten your bikes coneset.

Originally posted by abhisheklalnediya View Post

I used to close the fuel when ever I park it for more than an hour. Is it a good practice

But lately I am observing that the it hesitates to start when fuel is closed for more than 1~2 hrs. if I left the fuel open or reserve then there is no problem.I try shaking and opening full throttle, chock.... Chock works but opeing full throttle while starting does not worksIts not a cold start problem as it happens at noon on sunlight too.I think the fuel is some how escaping through carb.What should I do

Clean the slow jet of carb. All problems will vanish. Do not touch anything else.

**sinnerz2000** · 10-24-2013, 01:42 AM

re: CBZ xtreme / Hunk

Originally posted by sibun View Post

Your bike has run only 900 km and you are thinking about touching the carb. My advice is a strict no. Not only you but even do not let the SVC mechanic touch the carb. From the photo that you have posted the mixture screw position looks correct. No need to fiddle with it. Rpm falls slowly because engine is new so the bike has more friction and also no carbon on head. So wait for engine to free up and head to build some carbon and all your problems will be solved.And tuning carburettor is not easy as i have described. It takes loads of experience to detect the firing of engine and fuel ratio link. It took me almost 5-6 years to learn to tune the carburettor perfectly that too guidance from mechanic and on slide carbs which are easy to detect changes in sound. In CV carb change in sound is difficult to detect and needs lots of experience to tune. A person can rebuilt a engine by looking at pictures and following instructions, but to tune the carburettor will need lots of experience and ability to detect difference in sound.Yes you can use hunk/extreme bore kit in unicorn, no problem.The problem with UNICORN kit is that to increase mileage and smoothness Honda has given soft rings and more clearance. It helps in having almost zero running-in, mileage from new, and smoothness. If you use Hunk/extreme kit then let me tell you initially the bore will be very tight and engine will feel stressed. Will have to complete 1000 km running-in, mileage will gradually increase after running a bit and also smoothness will increase as you pile on kilometers.Another advantage is that when the new bore kit of unicorn will start smoking after some kilometers the hunk/extreme bore will still feel hard compression.No never ride without the air filter. It will damage the bore. If bike is strugling lean the mixture by half a turn and after returning to ground level tune it back to original. If you have a permanent marker mark the original position of screw with the body of carburettor for easy setting.Previously USHA was the OE supplier to HERO, but when conflict between Hero and HONDA started in 2006 vendor was changed. But after partition again vendor has been changed to USHA.I am using USHA bore kit in my Joy. The quality is same that came with my Joy in 2001(man those days when quality takes precedence over price). The piston is semi-forged and has 11% silicon which prevents it expansion when heated.New bore kit for extreme is USHA and the rings are from GOETZE.PSR sir has replied on your gasket problem.For handle problem tighten your bikes coneset.Clean the slow jet of carb. All problems will vanish. Do not touch anything else.

What about performance? Will the FE be of unicorn or hunk/extreme if I use its bore kit?

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**sibun** · 10-25-2013, 01:06 PM

re: CBZ xtreme / Hunk

Originally posted by sinnerz2000 View Post

What about performance? Will the FE be of unicorn or hunk/extreme if I use its bore kit?

Sent from my F8 using Tapatalk

Fe efficiency will same as unicorn because bore doesn't give mileage. Instead performance will be better as the extreme bore will have more compression.

Extreme gives less mileage than unicorn as it is performance oriented.
The difference are:-
1. Head is redesigned with better gas flow for more flow of gasses to increase the power and revving nature.
2. Valves and camshaft- Valves are having a higher lift and the cam has long duration lift which opens the valves for greater duration.
3. Carburetor- Carb is bigger as unicorn uses 26mm carb and extreme uses 28 mm carb. Even the unicorn uses 112 main jet while extreme uses 128 size main jet, bigger than karizma main jet.
4. Ignition timing- The ignition timing is more aggressive and torque has been moved from 5500 rpm in unicorn to 6500 in extreme and power has been increased from 13.3 bhp @ 8000 rpm in unicorn to 14.4 bhp @ 8500 rpm in extreme.

So with all this extreme gives only 5 KPL less than unicorn. However once you cross 6k rpm in extreme mileage will decrease rapidly. But the pull after 6k rpm is worth the decrease in mileage. After 6k rpm the engine note deepens and bike races towards the red line in jiffy. Even in fifth gear the bike pulls so rapidly to red line that you think you have another gear left.

No problem in using extreme bore. Mileage will be same as unicorn.

**sinnerz2000** · 10-25-2013, 02:32 PM

re: CBZ xtreme / Hunk

Originally posted by sibun View Post

Fe efficiency will same as unicorn because bore doesn't give mileage. Instead performance will be better as the extreme bore will have more compression.

Extreme gives less mileage than unicorn as it is performance oriented.
The difference are:-
1. Head is redesigned with better gas flow for more flow of gasses to increase the power and revving nature.
2. Valves and camshaft- Valves are having a higher lift and the cam has long duration lift which opens the valves for greater duration.
3. Carburetor- Carb is bigger as unicorn uses 26mm carb and extreme uses 28 mm carb. Even the unicorn uses 112 main jet while extreme uses 128 size main jet, bigger than karizma main jet.
4. Ignition timing- The ignition timing is more aggressive and torque has been moved from 5500 rpm in unicorn to 6500 in extreme and power has been increased from 13.3 bhp @ 8000 rpm in unicorn to 14.4 bhp @ 8500 rpm in extreme.

So with all this extreme gives only 5 KPL less than unicorn. However once you cross 6k rpm in extreme mileage will decrease rapidly. But the pull after 6k rpm is worth the decrease in mileage. After 6k rpm the engine note deepens and bike races towards the red line in jiffy. Even in fifth gear the bike pulls so rapidly to red line that you think you have another gear left.

No problem in using extreme bore. Mileage will be same as unicorn.

Thanks, that was very informative. So again I'll have to buy the usha kit right? And not from asc

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**sibun** · 10-25-2013, 06:21 PM

re: CBZ xtreme / Hunk

Originally posted by sinnerz2000 View Post

Thanks, that was very informative. So again I'll have to buy the usha kit right? And not from asc

Sent from my F8 using Tapatalk

I do not know if USHA supplies aftermarket bore kit for extreme. If you wait for some days i can confirm from my friend. Else go to Hero dealership and get one as OE is Usha.

**sinnerz2000** · 10-25-2013, 07:41 PM

re: CBZ xtreme / Hunk

Originally posted by sibun View Post

I do not know if USHA supplies aftermarket bore kit for extreme. If you wait for some days i can confirm from my friend. Else go to Hero dealership and get one as OE is Usha.

I can wait, I'm not even sure if I need a cylinder replacement, I'm just getting all the info ready.

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**nishesh.kumar** · 10-25-2013, 10:09 PM

re: CBZ xtreme / Hunk

I had replaced the cylinder kit of my xtreme just 2 months ago.
I had inquired about USHA kit, but was unable to find one. I also believe that USHA does not supplies aftermarket cylinder kit for xtreme/hunk.
Finally I settled for the OE one, which is performing well.

**sinnerz2000** · 10-25-2013, 10:26 PM

re: CBZ xtreme / Hunk

Originally posted by nishesh.kumar View Post

I had replaced the cylinder kit of my xtreme just 2 months ago.
I had inquired about USHA kit, but was unable to find one. I also believe that USHA does not supplies aftermarket cylinder kit for xtreme/hunk.
Finally I settled for the OE one, which is performing well.

USHA provides piston assembly, I haven't come across any post here with an USHA bore, so I guess I'll have to buy the bore from ASC.

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