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Author Topic: Blue Haze - a two-stroke miscellany  (Read 83929 times)

Offline CrabsAndCylinders

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Re: Blue Haze - a two-stroke miscellany
« Reply #340 on: Oct 27, 2016, 18:31:40 »
Or just buy the Dunstall GT750 that I have almost finished.  It runs and sounds amazing and now to fix up the niggling things like tidying up the wiring (again) and fixing the slow leak from the refurbished water pump - it's fixed now with another new mechanical seal.

Gt750 is a big bike and relatively easy to improve and reduce weight and add HP to.

Do you have a thread on the Dunstall  GT750 or pics of it.
Lighter, Quicker, Faster.
ZX-14, 900F x 2, 1100F, R100, CBR600, SR500, GT500, RZ350, KZ1000 x 2, Moto Guzzi Lemans lll, CBX550, RD 350, 750 SOHC police special, RG250, TL1000R, GT750, KTM Super Duke 1290 R, Harris/Z-1, Norton 750 Commando, Green 77 KZ650

Offline stroker crazy

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Re: Blue Haze - a two-stroke miscellany
« Reply #341 on: Nov 09, 2016, 04:23:06 »
'Taco time!

from Progress is fine
“Ride like the Wind” W.H.

Offline Tune-A-Fish©

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Re: Blue Haze - a two-stroke miscellany
« Reply #342 on: Nov 09, 2016, 11:59:03 »



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"I didn't come here and I ain't leavin"  Willie Nelson

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Offline teazer

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Re: Blue Haze - a two-stroke miscellany
« Reply #343 on: Nov 09, 2016, 15:55:10 »
Got the GS1100 swing arm and the modern forks from a Kawasaki ZX7R. Going incognito to run a modern set of wheels and brakes. I plan on getting the lift plate and the porting done professionally along with a new bore and Pistons since the current bore is shot. Is there any work that can be done with the head?  Thanks.


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Good question.  The first thing to know about a GT750 head is that the bores and combustion chambers don't always match well.  Heads can be 3mm or more offset to one side or the other.  They are also an open or Quiescent design - no squish band at all.  So they need to be modified to match the barrel being used.  You can weld up the chambers and re-machine from scratch or have the head machined to take inserts (domes).  Look at a Banshee Cool Head for ideas.

For a moderate state of tune, you can simply machine the block to get zero deck height and use a thinner head gasket from Cometic and machine 1mm or more off the head to raise compression.  Mine is done that way and is in very milf tune and runs less advance that stock to play safe. 

Offline teazer

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Re: Blue Haze - a two-stroke miscellany
« Reply #344 on: Nov 09, 2016, 15:57:11 »
I want to say that's a Metzler Laser tire set, but are they that old or am I lol

Both.  :-)

I still have  a pair of ME33 Laser Comp Ks on my RZ that I fitted , oh shall we say, more than a few years ago.

Offline bradj

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Re: Blue Haze - a two-stroke miscellany
« Reply #345 on: Nov 09, 2016, 16:41:33 »
Tr500 project

Offline stroker crazy

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Re: Blue Haze - a two-stroke miscellany
« Reply #346 on: Nov 09, 2016, 17:17:48 »
“Ride like the Wind” W.H.

Offline Ply318ci

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Re: Blue Haze - a two-stroke miscellany
« Reply #347 on: Nov 09, 2016, 17:56:34 »

Good question.  The first thing to know about a GT750 head is that the bores and combustion chambers don't always match well.  Heads can be 3mm or more offset to one side or the other.  They are also an open or Quiescent design - no squish band at all.  So they need to be modified to match the barrel being used.  You can weld up the chambers and re-machine from scratch or have the head machined to take inserts (domes).  Look at a Banshee Cool Head for ideas.

For a moderate state of tune, you can simply machine the block to get zero deck height and use a thinner head gasket from Cometic and machine 1mm or more off the head to raise compression.  Mine is done that way and is in very milf tune and runs less advance that stock to play safe.

Good info thanks. I will take that into account once I get back to building this thing. Thanks again.


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Offline bradj

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Re: Blue Haze - a two-stroke miscellany
« Reply #348 on: Nov 13, 2016, 00:50:10 »
Happy now crazy?

Offline hooligan998

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Re: Blue Haze - a two-stroke miscellany
« Reply #349 on: Nov 13, 2016, 01:33:57 »
Happy now crazy?

Well if he isn't, I am.  Nice!