The Twin Spark Psyched Bull !

jkdas · 29th March 2007, 12:02

The project started some months back when my friend and TBHPian bought Psycho's 30yr old Bull. After many mods including some cosmetic ones, guys I present to you the Twin Spark Pysched Bullet. My friend would go into tech details & sort and I add my logs as and when I get time.

Couldnt wait to start this thread as I just came back after a test ride along B.G. Road, after he added the TS last eve. I am damn impressed as I was the guy who road the Bullet after buyng from Pyscho months back as I was the other test rider other than the owner.

With proper mods like better matching of carb (it now breathes via a VM28 carb with a conical air filter) etc, it WILL or rather we intend to make it do a genuine 140kmph bike

theMAG · 29th March 2007, 12:17

Where's BG Road - next to MG Road? And Sankar's one hell of a lucky dude

vezj420 · 29th March 2007, 12:40

pics?? and report, JK? I rushed to this thread after getting your msg!

Psycho · 29th March 2007, 12:42

Where is Shankar.... time to rip him off the guy too many of my rides around... and JK I already have the updates on the wheelspins

condor · 29th March 2007, 13:40

Was this the same Bull that was at the Bhagini meet when Ram was here ?

jkdas · 29th March 2007, 14:23

Condor; yah the same bullet. It was running on an old head, cams etc then.

Sankar isnt doing well and I was the first guy to test the bike after he got the twin sparks. The twins get life via two Lucas 6V coils in series. These we added last day after he tried and drained the bike's battery within hours after using the ignition coil he had of his old CB750.

A pic I took today. I think Sankar may have the pix when the bike was being modded ( the engine works).

rjstyles69 · 29th March 2007, 14:46

Wo wo wo !! Now we know why JK and Sankar was missing.
Lucky dudes whenzz the pics coming through?
Das ettaa Sangar yevide?

(mallu ishtyle)

ananthkamath · 29th March 2007, 17:57

So you guys put in two spark plugs? If so, pics please.....

Jaggu · 29th March 2007, 19:05

good going, hope that mad monkey gets well soon and write the story

good going bro

jkdas · 29th March 2007, 20:07

Quote:

Originally Posted by ananthkamath

So you guys put in two spark plugs? If so, pics please.....

yah, one the new bosch one that you guys find in the apache. So we have two different types of plugs. And teh extra one goes where you have that valve for decompression

The intake has a funnel shape to give more turbulence but not polished for teh same cause.

Hope he has the pix of that too.

nikkibike · 30th March 2007, 10:14

Thatz great project there JK and Shankar!!

Do let us know more tech deets on the project execution.

Sankar · 30th March 2007, 17:57

The bike's head has been done by our psycho the intake the exhaust the valve seats the valve guides everything has been done by him. It was only last week the bike was took out from the workshop after an engine reset job and the installation of the worked head.

The tuning is still in progress and i can't say that the bike is running at it's maximum now. The carb manifold is a problem as the intake area is too low compared to the enlarged ports, it's acting as a bottle neck now. The bike does feel fast compared to the earlier setup.

The compression has not been increased it's running the stock 6.5:1, compression increasing would be done as the second stage. The twin plug mod has been done by me, it was simple excercise of grinding off the decomp area and fitting a long thread sparkplug in it. The plugs are fed by two 6volt coils connected in series (thanks to Nomad for the hint) and is running fine. One plug is the Bocsh super 4 (don't know bout apache plug) and the other one is a normal mico Bosch.

I'm running 150 size main jet as of now on the VM28 but can't see any black smoke coming out of the exhaust

Might as well go for a larger Jet and see.

My target is to make this bike reliably do around 125-130 true speed. But before that i got to upgrade the brakes...half drums front and rear just don't cut it!!

There isnt much to see in the pics except a lil bit of alteration to the batterybox and all.. I didn't take the head and port pics when i had the chance... Will post the pics of the twin plugs soon. Still some issues are to be resolved with carburation and timing.

Jaggu · 30th March 2007, 18:07

hmm, ur referring to manifold dia right?

Godfather · 30th March 2007, 18:26

Quote:

Originally Posted by Sankar

My target is to make this bike reliably do around 125-130 true speed. But before that i got to upgrade the brakes...half drums front and rear just don't cut it!!

I am speechless.. I wanna ride on it.. First one to ask so i get priority..v1p3r i beat you here..

as for the brakes..why not try the OE Disc brakes that bullet is rolling out on for the Machismo models.. They should fit..

When do we get to see the bike?????

Godfather

v1p3r · 30th March 2007, 19:04

Quote:

Originally Posted by Godfather

First one to ask so i get priority..v1p3r i beat you here..

No, you didn't. It's called PM.

29th March 2007, 12:02	#1
jkdas Senior - BHPian Join Date: Sep 2005 Location: Thiruvananthapu Posts: 9,685 Thanked: 1,497 Times View My Garage	The Twin Spark Psyched Bull ! The project started some months back when my friend and TBHPian bought Psycho's 30yr old Bull. After many mods including some cosmetic ones, guys I present to you the Twin Spark Pysched Bullet. My friend would go into tech details & sort and I add my logs as and when I get time. Couldnt wait to start this thread as I just came back after a test ride along B.G. Road, after he added the TS last eve. I am damn impressed as I was the guy who road the Bullet after buyng from Pyscho months back as I was the other test rider other than the owner. With proper mods like better matching of carb (it now breathes via a VM28 carb with a conical air filter) etc, it WILL or rather we intend to make it do a genuine 140kmph bike
	() Thanks

29th March 2007, 12:17	#2
theMAG Distinguished - BHPian Join Date: May 2006 Location: Avon, CT Posts: 7,196 Thanked: 1,823 Times View My Garage	Where's BG Road - next to MG Road? And Sankar's one hell of a lucky dude
	() Thanks

29th March 2007, 12:40	#3
vezj420 BHPian Join Date: Oct 2006 Location: Bangalore Posts: 264 Thanked: 23 Times	pics?? and report, JK? I rushed to this thread after getting your msg!
	() Thanks

29th March 2007, 12:42	#4
Psycho Senior - BHPian Join Date: Jul 2004 Location: Bangalore Posts: 1,040 Thanked: 111 Times View My Garage	Where is Shankar.... time to rip him off the guy too many of my rides around... and JK I already have the updates on the wheelspins
	() Thanks

29th March 2007, 13:40	#5
condor Distinguished - BHPian Join Date: Jun 2006 Location: Speed-brkr City Posts: 16,242 Thanked: 16,900 Times View My Garage	Was this the same Bull that was at the Bhagini meet when Ram was here ?
	() Thanks

29th March 2007, 14:23	#6
jkdas Senior - BHPian Join Date: Sep 2005 Location: Thiruvananthapu Posts: 9,685 Thanked: 1,497 Times View My Garage	Condor; yah the same bullet. It was running on an old head, cams etc then. Sankar isnt doing well and I was the first guy to test the bike after he got the twin sparks. The twins get life via two Lucas 6V coils in series. These we added last day after he tried and drained the bike's battery within hours after using the ignition coil he had of his old CB750. A pic I took today. I think Sankar may have the pix when the bike was being modded ( the engine works).
	() Thanks

29th March 2007, 14:46	#7
rjstyles69 Senior - BHPian Join Date: Sep 2006 Location: Bengalooru.. Posts: 4,343 Thanked: 845 Times View My Garage	Wo wo wo !! Now we know why JK and Sankar was missing. Lucky dudes whenzz the pics coming through? Das ettaa Sangar yevide? (mallu ishtyle)
	() Thanks

29th March 2007, 17:57	#8
ananthkamath Senior - BHPian Join Date: Jul 2005 Location: Mangalore Posts: 1,209 Thanked: 82 Times View My Garage	So you guys put in two spark plugs? If so, pics please.....
	() Thanks

29th March 2007, 19:05	#9
Jaggu Team-BHP Support Join Date: May 2004 Location: Bangalore Posts: 20,376 Thanked: 17,312 Times	good going, hope that mad monkey gets well soon and write the story good going bro
	() Thanks

30th March 2007, 10:14	#11
nikkibike BHPian Join Date: May 2006 Location: QoAS Posts: 526 Thanked: 4 Times	Well done dudes!! Thatz great project there JK and Shankar!! Do let us know more tech deets on the project execution.
	() Thanks

30th March 2007, 17:57	#12
Sankar Senior - BHPian Join Date: May 2005 Location: Location Posts: 5,780 Thanked: 9,254 Times	The bike's head has been done by our psycho the intake the exhaust the valve seats the valve guides everything has been done by him. It was only last week the bike was took out from the workshop after an engine reset job and the installation of the worked head. The tuning is still in progress and i can't say that the bike is running at it's maximum now. The carb manifold is a problem as the intake area is too low compared to the enlarged ports, it's acting as a bottle neck now. The bike does feel fast compared to the earlier setup. The compression has not been increased it's running the stock 6.5:1, compression increasing would be done as the second stage. The twin plug mod has been done by me, it was simple excercise of grinding off the decomp area and fitting a long thread sparkplug in it. The plugs are fed by two 6volt coils connected in series (thanks to Nomad for the hint) and is running fine. One plug is the Bocsh super 4 (don't know bout apache plug) and the other one is a normal mico Bosch. I'm running 150 size main jet as of now on the VM28 but can't see any black smoke coming out of the exhaust Might as well go for a larger Jet and see. My target is to make this bike reliably do around 125-130 true speed. But before that i got to upgrade the brakes...half drums front and rear just don't cut it!! There isnt much to see in the pics except a lil bit of alteration to the batterybox and all.. I didn't take the head and port pics when i had the chance... Will post the pics of the twin plugs soon. Still some issues are to be resolved with carburation and timing.
	() Thanks

30th March 2007, 18:07	#13
Jaggu Team-BHP Support Join Date: May 2004 Location: Bangalore Posts: 20,376 Thanked: 17,312 Times	hmm, ur referring to manifold dia right?
	() Thanks