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Old 29th March 2007, 12:02   #1
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Cool 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
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Old 29th March 2007, 12:17   #2
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Where's BG Road - next to MG Road? And Sankar's one hell of a lucky dude
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Old 29th March 2007, 12:40   #3
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pics?? and report, JK? I rushed to this thread after getting your msg!
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Old 29th March 2007, 12:42   #4
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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
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Old 29th March 2007, 13:40   #5
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Was this the same Bull that was at the Bhagini meet when Ram was here ?
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Old 29th March 2007, 14:23   #6
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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).
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Old 29th March 2007, 14:46   #7
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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)
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Old 29th March 2007, 17:57   #8
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So you guys put in two spark plugs? If so, pics please.....
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Old 29th March 2007, 19:05   #9
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good going, hope that mad monkey gets well soon and write the story good going bro
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Old 29th March 2007, 20:07   #10
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Quote:
Originally Posted by ananthkamath View Post
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.
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Old 30th March 2007, 10:14   #11
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Thumbs up Well done dudes!!

Thatz great project there JK and Shankar!! Do let us know more tech deets on the project execution.
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Old 30th March 2007, 17:57   #12
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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.
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Old 30th March 2007, 18:07   #13
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hmm, ur referring to manifold dia right?
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Old 30th March 2007, 18:26   #14
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Quote:
Originally Posted by Sankar View Post
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?????

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Old 30th March 2007, 19:04   #15
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Quote:
Originally Posted by Godfather View Post
First one to ask so i get priority..v1p3r i beat you here..
No, you didn't. It's called PM.
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