Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)

Finally found some pistons to fit the cylinders the cycle shop bored
to 69.5mm vs. 69mm for the KZ750 big bore Wisecos. The bore dia.
and the pin dia. are the same. The bad part is the deck height is shorter.
The block will have to be milled some, but it should work. Piston is a
flat top, shooting for an 8/1 compression ratio.
End result will be (with any luck) a turbocharged 470cc 440 with my
analog(?) fuel injection supplemented with a pair of constant flow injectors.
Here are a couple of lousy phone pics. Second pic is a stock piston with
the depth bar on a dial caliper to show the difference vs. stock.
Will post some better ones later.


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You do at least win some sort of award for the longest standing run of technical bullshit with noone calling you on it. Theres just so much going wrong here that I can't even start. Don't worry, I won't post again. Just bookmarking for entertainment.
 
Here are some better pics.
Piston is Wiseco, 1.0 over for a trx250ex Honda quad.
It's the only one I could find with a 69.5 bore and 15mm pin.
I was unable to locate any info on pin height. Not until
the local cycle shop had one in for a rebore did I have
a chance to measure one. Being the stock 250ex piston
is .085 shorter than the 440 I decided to give it a try.
Turns out the Wiseco piston is shorter yet.

Stock 440 = .675
Stock 250ex = .590
Wiseco. = .563




DohcBikes,
Hope you resolve whatever issues are bothering you.
A lot of your posts seam to be on the negative side.
So like they say in the South, 'bless your heart'.


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Nebr_Rex said:
DohcBikes,
Hope you resolve whatever issues are bothering you.
A lot of your posts seam to be on the negative slide.
So like they say in the South, 'bless your heart'.
.
That's saying he's retarded. ;)


Sent from my iPad using Tapatalk
 
Is that a ceramic coating on the Wiseco piston skirt? Keep up the good work, been following your progress, very interesting.
 
I acquired another toy/tool a little while ago. To help me with some of my crazy ideas.
Here are a couple of pics and a video (15 min. you'll never get back) of the head for my Ranger.

https://www.youtube.com/watch?v=jm_Bk1o0Chg










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very nice. how do you polish that step in the head after making the port bigger? die grinder?
 
Several die grinders and a collection of carbide burrs, stones etc......
that I have been picked up over the years. I will not polish the intakes
First head I got greedy and blew threw one of the intakes.


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Back to motorcycles.
Milled the block for the shorter Honda pistons.
Needed .118 in. so I just took a straight .120 off.
You can see the difference where the displacement
is cast in the bottom of the block.


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will removing that much material cause the cam chain to have extra slack? will the tensioner be able to take up that much?
 
There is not a thread on DTT that makes my head hurt more than this one.

Best of luck Rex. If you're in the Lincoln area we should have a beer and not talk about motorcycles at all
 
I thought about that. I'm stuck with the bore job the cycle shop had done.
Going to try making lemonaide out of a lemon set of sleeves. The pistons
can be resold since that model of quad is starting to show up needing engine
work. Might have to shim out a chain guide or two.


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DohcBikes said:
There is not a thread on DTT that makes my head hurt more than this one.

Best of luck Rex. If you're in the Lincoln area we should have a beer and not talk about motorcycles at all

I had more than my share at the co. Christmas party last night.


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Nebr_Rex said:
I thought about that. I'm stuck with the bore job the cycle shop had done.
Going to try making lemonaide out of a lemon set of sleeves. The pistons
can be resold since that model of quad is starting to show up needing engine
work. Might have to shim out a chain guide or two.


.
You do realize he is talking about deck height, right?

Tip of the iceberg.

Are my ears smoking yet?
 
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