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Author Topic: Blue Haze - a two-stroke miscellany  (Read 82292 times)

Offline CrabsAndCylinders

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Re: Blue Haze - a two-stroke miscellany
« Reply #470 on: Jun 16, 2017, 15:00:34 »
This maybe?
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Online Hurco550

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Re: Blue Haze - a two-stroke miscellany
« Reply #471 on: Jun 24, 2017, 23:55:48 »
Went up to a memorial service for a snowmobile buddy of ours who recently passed of cancer. Many people showed up in all manner of vehicles, but this one obviously caught my eye. All original first year buffalo. Survivor barn find with somewhere around 7k miles. Not perfect, but a very neat bike!


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"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
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1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
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1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline cobraace2

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Re: Blue Haze - a two-stroke miscellany
« Reply #472 on: Jul 24, 2017, 11:26:33 »
Highwayman LSR I know this guy his work is incredible
notice the port work pictures do not do it justice






Offline cobraace2

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Re: Blue Haze - a two-stroke miscellany
« Reply #473 on: Jul 24, 2017, 11:39:56 »
notice how the studs get ported to ;)






Offline teazer

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Re: Blue Haze - a two-stroke miscellany
« Reply #474 on: Jul 24, 2017, 13:05:26 »
Amazing work.  Can someone explain what he has done and why?

It looks like he took two sets of TZ250G barrels (with fat intake ports stock) and welded in a bridge in the intake and then added reed boxes and rear boost ports.

On the exhaust side he appears to have added a pair of eyebrow ports for more initial time-area and more blowdown T-A.  And he's machined up some new studs to provide space for those extra ports.  But the exhausts are extremely wide and those oval outlets are not stcok on those barrels.  That's an interesting mod.

The reshaped front (main) transfer port was either been welded to allow sufficient bridge to the exhaust ports or has been raised and that would be unusual, so I'm guessing they were also welded.

The welding along the front lower flange and machined away water jackets are very interesting.  Is he running it dry and arranging to have forced air to stop it melting on a long run?  That I don't get. on an LSR bike, weight is less important that power and drag, so there's some thinking that isn't obvious.  If it's to be aircooled, would it not be easier to start with an RD250 barrel or would that need even more welding and machining to work?


Offline Redbird

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Re: Blue Haze - a two-stroke miscellany
« Reply #475 on: Jul 24, 2017, 14:31:59 »
And, forgive my ignorance, but wouldn't sectioning out the head studs be counterproductive to the clamping strength?
For clarification, I'm not bashing/flaming, just trying to understand.
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Offline teazer

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Re: Blue Haze - a two-stroke miscellany
« Reply #476 on: Jul 24, 2017, 15:59:22 »
Short answer is yes, but how strong do they need to be?  I don;t know but I am guessing that Jeff Henise will soon find out. He still has to cut or roll threads and work out what he's doing about the sleeve nuts.  My guess is he won't use them but will use simple nuts on top of the head.

Those studs look more like 10 or maybe 12mm diameter so it's also possible that he moved them slight outwards at the same time as going up from stock 8mm. The cutaways look to be in odd places and direction but we can't see the ports in relation to them

Offline DesmoBro

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Re: Blue Haze - a two-stroke miscellany
« Reply #477 on: Jul 24, 2017, 21:37:02 »
Im tryin squeeze every last ounce outta this stock bore moped....hoping to see 60 mph then apply same shit to this 4 speed bottom end to try and hit 100
"I desire the things that will destroy me in the end"

Offline BillyGoat4130

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Re: Blue Haze - a two-stroke miscellany
« Reply #478 on: Jul 24, 2017, 22:59:17 »
Some of ya'll seen it in the specials section already I'm sure, but I sure do like staring at this thing!
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Online Hurco550

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Re: Blue Haze - a two-stroke miscellany
« Reply #479 on: Jul 24, 2017, 23:04:43 »
I like starting at that thing too.

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"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet