New Unicorn problems

rb2399 · 23rd May 2007, 20:51

Hi All,
Recently I bought "all new" Unicorn. It has done ~ 800 kms (first servicing done).
I'm having problems with clutch judder in first gear (when taking off from standstill).
Also once I cross ~ 4000 rpm mark, the engine loses its smoothness and I can sense the vibrations and the noise is also quite audible.
I had stated the first problem to the servicing person & he did some tweaking. But after running the bike for 100 kms, the clutch judder seems to have come back.

What could be the problem here??

Thanks,
rb2399

moralfibre · 23rd May 2007, 21:25

RB what exactly do you mean by clutch judder? Also my old version Unicorn makes a sound at 4k ++ rpm. Any bike will.

sathyaprakash · 23rd May 2007, 21:26

i own a unicorn for more than two years and i have not experienced any thing like this may be manufacturing defect pls check with the right mechanic

rb2399 · 23rd May 2007, 21:38

The bike does not accelerate smoothly in 1st gear (only) & that too at places like signals where you stop and start again....It's a jerky motion.
The 4000 rpm I'm talking about here is in all the gears;be it 1st or 5th.

Thanks,
rb2399

nosfreak · 24th May 2007, 14:31

the clutch may be too tight which may be the cause.

mithun · 26th May 2007, 06:18

Try to re-adjust the clutch and also make sure that the cable is not stuck anywhere.

Zappo · 26th May 2007, 15:23

At 800 kms your bike would not have completed its run-in period as yet. I would suggest you do not force it at such high rpm levels. Till the engine properly beds it tends to feel a bit harsh at high rpm. Thats natural.

Also, what is clutch judder with respect to a bike?

rider60 · 4th August 2007, 04:07

1.check the clutch cable if the cable inside is properly lubricated.
2.check if the choke cable is in proper condition i.e. if its jammed or harder.
i had the same problem of jerking and found out that my choke cable was jammed due to rain. it happened this reason and my bike is new too i bought this april. but i chose the non mag version!

the problem can also be from the improper setting of the crab, before the runin period no bike gives the optimal mileage for the crab is set to pour in more fuel to ensure correct completion of bike's runin as this ensures there is enough fuel in the engine to lubricate it.
if the crab is not been tuned by a experienced mechanic after the first service the above mentioned problems are inevitable!

23rd May 2007, 20:51	#1
rb2399 BHPian Join Date: May 2006 Location: Pune Posts: 233 Thanked: 1,120 Times	New Unicorn problems Hi All, Recently I bought "all new" Unicorn. It has done ~ 800 kms (first servicing done). I'm having problems with clutch judder in first gear (when taking off from standstill). Also once I cross ~ 4000 rpm mark, the engine loses its smoothness and I can sense the vibrations and the noise is also quite audible. I had stated the first problem to the servicing person & he did some tweaking. But after running the bike for 100 kms, the clutch judder seems to have come back. What could be the problem here?? Thanks, rb2399
	() Thanks

23rd May 2007, 21:25	#2
moralfibre Team-BHP Support Join Date: Dec 2004 Location: MH-12 Posts: 8,495 Thanked: 14,118 Times	RB what exactly do you mean by clutch judder? Also my old version Unicorn makes a sound at 4k ++ rpm. Any bike will.
	() Thanks

23rd May 2007, 21:26	#3
sathyaprakash BHPian Join Date: Jul 2006 Location: chennai Posts: 448 Thanked: 46 Times	i own a unicorn for more than two years and i have not experienced any thing like this may be manufacturing defect pls check with the right mechanic
	() Thanks

23rd May 2007, 21:38	#4
rb2399 BHPian Join Date: May 2006 Location: Pune Posts: 233 Thanked: 1,120 Times	The bike does not accelerate smoothly in 1st gear (only) & that too at places like signals where you stop and start again....It's a jerky motion. The 4000 rpm I'm talking about here is in all the gears;be it 1st or 5th. Thanks, rb2399
	() Thanks

24th May 2007, 14:31	#5
nosfreak BHPian Join Date: Mar 2006 Location: Hyd Posts: 265 Thanked: 28 Times View My Garage	the clutch may be too tight which may be the cause.
	() Thanks

26th May 2007, 06:18	#6
mithun BANNED Join Date: Jan 2006 Location: Cochin Posts: 2,195 Thanked: 268 Times	Try to re-adjust the clutch and also make sure that the cable is not stuck anywhere.
	() Thanks

26th May 2007, 15:23	#7
Zappo Team-BHP Support Join Date: Oct 2005 Location: Hyderabad Posts: 5,937 Thanked: 2,730 Times	At 800 kms your bike would not have completed its run-in period as yet. I would suggest you do not force it at such high rpm levels. Till the engine properly beds it tends to feel a bit harsh at high rpm. Thats natural. Also, what is clutch judder with respect to a bike?
	() Thanks

4th August 2007, 04:07	#8
rider60 Senior - BHPian Join Date: Mar 2007 Location: Bhagyanagaram. (A.K.A. Hyderabad) Posts: 1,620 Thanked: 56 Times View My Garage	1.check the clutch cable if the cable inside is properly lubricated. 2.check if the choke cable is in proper condition i.e. if its jammed or harder. i had the same problem of jerking and found out that my choke cable was jammed due to rain. it happened this reason and my bike is new too i bought this april. but i chose the non mag version! the problem can also be from the improper setting of the crab, before the runin period no bike gives the optimal mileage for the crab is set to pour in more fuel to ensure correct completion of bike's runin as this ensures there is enough fuel in the engine to lubricate it. if the crab is not been tuned by a experienced mechanic after the first service the above mentioned problems are inevitable! Last edited by rider60 : 4th August 2007 at 04:11.
	() Thanks