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Message started by dv8savagerider on 04/24/11 at 17:46:15

Title: anyone heard of this?
Post by dv8savagerider on 04/24/11 at 17:46:15

I was talking to a friend today whose dad is pretty knowledgeable on bikes and he told me that there is a kit out for the 650 engines to turn them into 750's.  Apparently it is a spacer that you put between the lower half and top half of the engine thus increasing the cylinder depth.  I did a quick search online and came up with nothing on the subject.  Has anyone heard of this?  Very interested to find out.  Thanks again everyone.

Title: Re: anyone heard of this?
Post by IN-S40 on 04/24/11 at 17:52:03

Wouldnt you also have to increase the length of the stroke? Would take a new crank to do that...



Title: Re: anyone heard of this?
Post by dv8savagerider on 04/24/11 at 17:57:03

Thats what I was thinking.  Not sure of details of the kit thats why Im trying to see if anyone else has heard of this.

Title: Re: anyone heard of this?
Post by buttgoat1 on 04/24/11 at 18:48:01

I agree about the need for a new crank, but...............

if you bolted on a bigger bore cylinder with a new, larger piston ideally the same weight as a stocker or lighter.........

hmmmmmmmmmmmmm

Title: Re: anyone heard of this?
Post by mick on 04/24/11 at 22:17:12


756729252321110 wrote:
Thats what I was thinking.  Not sure of details of the kit thats why Im trying to see if anyone else has heard of this.

Not happy with a 650 ?  get a bigger bike.
Or if you are looking for speed get a 600 ninja.

Title: Re: anyone heard of this?
Post by Serowbot on 04/24/11 at 22:55:20


5C515C7B7E6D6D7A711F0 wrote:
Wouldnt you also have to increase the length of the stroke? Would take a new crank to do that...

Yes,... all this would do is lower the compression... You have to get more bore or stroke,...

Title: Re: anyone heard of this?
Post by verslagen1 on 04/24/11 at 23:04:42

they've already stroked this engine from a 400 to a 650.
Stroking it 750 would really cut down the rpm's.

might be ok for a high reving twin though.

Title: Re: anyone heard of this?
Post by thumperclone on 04/25/11 at 08:11:25

cheap way to do that is more gaskets at the bottom of the cyl..
but as stated drops compression..
the way to "stroke" is cut the connecting rod down    shorter stroke = more c.c.s

Title: Re: anyone heard of this?
Post by chickenwingsmmm on 04/25/11 at 08:55:19

Shortening the connecting rod will not give you a shorter stroke. One would have to shorten the crank to get a shorter stroke. Example- 1 hotrod 383 I have has 5.7 in rods, my other 383 has 6 inch rods. The stroke on both engines is 3.75 and the bore is 4.030. Also, a shorter stroke gives less, not more cc’s. Shortening the stroke (de-stroking) can only be done with a shorter crank. Rod length does not affect discplacement contrary to popular belief.

Title: Re: anyone heard of this?
Post by bill67 on 04/25/11 at 09:55:24


6D66676D656B60796760697D6363630E0 wrote:
Shortening the connecting rod will not give you a shorter stroke. One would have to shorten the crank to get a shorter stroke. Example- 1 hotrod 383 I have has 5.7 in rods, my other 383 has 6 inch rods. The stroke on both engines is 3.75 and the bore is 4.030. Also, a shorter stroke gives less, not more cc’s. Shortening the stroke (de-stroking) can only be done with a shorter crank. Rod length does not affect discplacement contrary to popular belief.

+1

Title: Re: anyone heard of this?
Post by OE on 04/25/11 at 10:51:32

Don't forget, pie are square.

X h    ;D

Title: Re: anyone heard of this?
Post by Serowbot on 04/25/11 at 10:55:00

Pie are round,...
Cake are square... :-?...

Title: Re: anyone heard of this?
Post by Yonuh Adisi FSO on 04/25/11 at 10:56:51


2335223F27323F24500 wrote:
Pie are round,...
Cake are square... :-?...


Depends on the cake.  ;)

Title: Re: anyone heard of this?
Post by Serowbot on 04/25/11 at 11:01:21


6751504B567F5A574D573E0 wrote:
[quote author=2335223F27323F24500 link=1303692375/0#11 date=1303754100]Pie are round,...
Cake are square... :-?...


Depends on the cake.  ;)[/quote]
Cake are round?... :-?...

Title: Re: anyone heard of this?
Post by verslagen1 on 04/25/11 at 11:29:55

Railroad tracks.

The  US standard railroad gauge (distance between the rails) is 4 feet, 8.5 inches. That's an exceedingly odd number.

Why was that gauge used?  Because that's the way they built them in England, and English expatriates designed the US railroads.

Why did the English build them like that? Because the first rail lines were built by the same people who built the pre-railroad tramways, and that's the gauge they used.

Why did 'they' use that gauge then?

Because the people who built the tramways used the same jigs and tools that they had used for building wagons, which used that wheel spacing.

Why did the wagons have that particular  odd wheel spacing?  

Well, if they tried to use any other spacing, the wagon wheels would break on some of the old, long distance roads in  England , because that's the spacing of the wheel ruts.  

So who built those old rutted roads?  

Imperial Rome built the first long distance roads in Europe (including England) for their legions. Those roads have been used ever since.

And the ruts in the roads?  Roman war chariots formed the initial ruts, which everyone else had to match for fear of destroying their wagon wheels.  

Since the chariots were made for Imperial Rome, they were all alike in the matter of wheel spacing. Therefore, the United States standard railroad gauge of 4 feet, 8.5 inches is derived from the original specifications for an Imperial Roman war chariot.  In other words, bureaucracies live forever.  

So the next time you are handed a specification/procedure/process, and wonder, 'What horse's ass came up with this?'  you may be exactly right!

Imperial Roman army chariots were made just wide enough to accommodate the rear ends of two war horses. (Two horses' asses.)  

Now, the twist to the story:  

When you see a Space Shuttle sitting on its launch pad, you will notice that there are two big booster rockets attached to the sides of the main fuel tank. These are solid rocket boosters, or SRBs. The SRBs are made by Thiokol at their factory in Utah ..

The engineers who designed the SRBs would have preferred to make them a bit larger, but the SRBs had to be shipped by train from the factory to the launch site. The railroad line from the factory happens to run through a tunnel in the mountains, and the SRBs had to fit through that tunnel. The tunnel is slightly wider than the railroad track, and the railroad track, as you now know, is about as wide as two horses' behinds.  

So, a major Space Shuttle design feature  of what is arguably the world's most advanced transportation system was determined over two thousand years ago by the width of a horse's ass. And you thought being a horse's ass wasn't important?  

So, Horse's Asses control almost everything...  

...Explains a whole lot of things,  doesn't it?  

Title: Re: anyone heard of this?
Post by dv8savagerider on 04/25/11 at 13:36:59

Thats one of the many reasons I enjoy reading these forum posts- you can take a topic and run with it or go completely off the topic and still tie it back in  ;D  But seriously, I dont want to go faster so dont want a crotch rocket or the likes- this savage is plenty for me for now.  Just wondered if anyone had heard of this- closest thing I can find is making it a stroker which some of you have already hit on.  That would be a fun winter project in the future  :)  Thanks for all the input so far, hope everyone continues to have fun with it.

Title: Re: anyone heard of this?
Post by mick on 04/25/11 at 13:45:45

everything is correct Vers, you did not mention that all the roman roads were as straight as possable, in fact the longest road in England is the old A1  goes from London to the scotish boarder,most of the origional road is still being used today,has McAdam on it now, And in alot of places the walls than run on the side of the road were also built by the romans.
I'm supprised that British cars are not built with the standard rail gauge
4' 8.5"
I wonder why the brits are not fond of Pasta.

Title: Re: anyone heard of this?
Post by OE on 04/25/11 at 13:52:53

Not speaking from experience because I've never tried anything like that but wouldn't that be quite expensive?  You could bore it out to get more cubes but to stroke it you'd have to have a different crankshaft with a longer stroke, right? Longer stroke would mean more cubes too.

Title: Re: anyone heard of this?
Post by verslagen1 on 04/25/11 at 15:02:11


0D000F0204135356610 wrote:
I got a little time yesterday between all the packing and stuff, and was able to get the new Wiseco forged high comp piston and a spare cylinder packed into a box and sent off to Bore-tech for a bore/hone, silicone carbide treatment on the cyl wall, bead blast and paint the outside of the cyl, and also have the piston treated on top and skirts with temp coating and slippery stuff.
All of that should reduce friction & heat significantly.  
Besides, REX will now be 694.64cc.  Adding the cc's raises the comp to 9.05:1, but this piston has a raised crown (2mm) which should bring the comp up to at least 10:1.
With this added to the higher lift camshaft, REX should have a bit more muscle on his bones.   ;)   :D   ;D   8-)


http://images1f.snapfish.com/232323232%7Ffp8%3B%3B%3Enu%3D323%3A%3E639%3E697%3EWSNRCG%3D3285393%3A%3B5339nu0mrj

You can get the wiseco pistons in 95, 96 or 97mm

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