727 it runs!

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Thunderbike_steve
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727 it runs!

Post by Thunderbike_steve » Thu Mar 08, 2012 8:10 pm

Hi all.
I finally got the 727cc'd 3tj motor fired up today. For those who don't know it was my plan to race this 2 years ago but sadly with family circumstances I've had to delay a while.
It's basically an old long throw crank from the 3he fzr600 in 400 engine cases with a thundercat top end bored out 3mm. But believe me there's more that goes in to it than you think.

Anyway she fired up pretty easy after 2 days pissing around with the race loom I made to finally realize I hadn't shorted out the side stand. Sounds a lot more grunty than a thunderkitty motor. Hoping to have it on a dyno in the next couple of weeks and have it ready for my first race at Brands in mid April.

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Drunkn Munky
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Re: 727 it runs!

Post by Drunkn Munky » Thu Mar 08, 2012 9:00 pm

727cc in a 400 frame, my kinda bike :o

What date you at brands, im only up the road and gota see this

hunter
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Re: 727 it runs!

Post by hunter » Thu Mar 08, 2012 9:57 pm

Now this sounds interesting,It's been a plan of mine to do this to. 8-)

Evilchicken0
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Re: 727 it runs!

Post by Evilchicken0 » Thu Mar 08, 2012 11:09 pm

F*ck yeah - I remember this one - you had to get a spacer plate made for the base gasket.

It' runs !!!
That's cool - so tell us when your at Brown Snatch and I'll try and get there too.

Well done matey

Thunderbike_steve
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Re: 727 it runs!

Post by Thunderbike_steve » Fri Mar 09, 2012 1:30 pm

Yes Boris I did indeed need the spacer gasket. I forget the size now but it cleared the extra length of the YZF rods on the fzr crank and reduced compression ratio to 12:1. I never doubted my maths in calculating it honest :whistle:

I think Brands is the weekend of the 14th April.

Few other things about it, it has a 2006 zx6r front end with r6 calipers. SRAD 600 swinger (Thats because its only 10mm longer than the 3tj one) Carrozzeria race wheel, pfm iron brakes, bdk tail unit and fairings will be TZ250 gp. I'm hoping its gonna be better than last time I raced it.

Evilchicken0
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Re: 727 it runs!

Post by Evilchicken0 » Fri Mar 09, 2012 2:20 pm

3 or 4 mm spacer with Hornet pistons ???

Was it you that had a RAF roundel on the bike .... ?
Anyway I'll pencil it into my diary

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CRM
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Re: 727 it runs!

Post by CRM » Sat Mar 10, 2012 8:27 am

i would love to see this too.
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thunderace
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Re: 727 it runs!

Post by thunderace » Sat Mar 10, 2012 8:45 am

Where did you plan on racing it? What class? :?:
Conventional wisdom says to know your limits. To know your limits you need to find them first. Finding your limits generally involves getting in over your head and hoping you live long enough to benefit from the experience. That's the fun part.

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CMSMJ1
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Re: 727 it runs!

Post by CMSMJ1 » Sat Mar 10, 2012 8:46 am

Thunderbike_Steve..

Thunderbikes then ;)

I want a 727cc 3TJ too
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NC30 - No9 - my old mate

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thunderace
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Re: 727 it runs!

Post by thunderace » Sat Mar 10, 2012 8:47 am

CMSMJ1 wrote:Thunderbike_Steve..

Thunderbikes then ;)

I want a 727cc 3TJ too


Hey! It's still early and I'm still fooked after yesterday :P
Conventional wisdom says to know your limits. To know your limits you need to find them first. Finding your limits generally involves getting in over your head and hoping you live long enough to benefit from the experience. That's the fun part.


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