Hole in the head !
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Hole in the head !
I'm getting ready to ship the 220 head and carb to RB. Here is a pic of my head!
Looking at the before and after pictures in CC's photo album, I notice that his stock engine head is different. CC's head doesn't have a hole in it! What is this?
Looking at the before and after pictures in CC's photo album, I notice that his stock engine head is different. CC's head doesn't have a hole in it! What is this?
KDX220 (RB'd, EFM Autoclutch, FMF Rev, KX front end... Crash proofed and crash tested tOO often !)
- Indawoods
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That's something they do special for Canadian bikes....
*** Administrator //***
****'95 KDX 200/****
"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
****'95 KDX 200/****
"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
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- scheckaet
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isn't that where you put the SPARK PLUG?
or maybe you have a special, limited edition: 220 and 1/2 cc
or maybe you have a special, limited edition: 220 and 1/2 cc
02 KX 200 hybrid: RB head and carb
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Sold ☹ DRZ 400 SM
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- thebleakness
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- fuzzy
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fuzzy wrote:That's a new one. Positive this head hasn't been off since the factory put it on? Could be an accident from when they machine the combustion chamber.
The head has been removed before to install a Wiseco kit (of course). I just never had the chance to compare it with others. I'm wondering what RB would do with this? (other than removing the legal mary-jane inside)
KDX220 (RB'd, EFM Autoclutch, FMF Rev, KX front end... Crash proofed and crash tested tOO often !)
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It is part of the machining process.....
If you look at a KDX 200 head, the entire combustion chamber and squish area are cast into it's shape.
When you look at a KDX 220 head you see that the entire combustion chamber and squish band are machined to it's shape.
If you have not guessed by now the 200 and 220 use the same casting and the only difference is the 200 head is uses the cast combustion chamber. The 220 head is a 200 casting and the combustion chamber is machined larger for the larger displacement of the 220 (the little dimple is part of the machining process).
OK...., now for the hard part for you to understand is, you really can not take a 200 head and machine it to a 200. WHY???? you ask, if the 220 head starts out as a 200...., why not.
The answer is that when the machine the spark plug hole and spot face it for the spark plug depth. the 200 head is machined deeper into the head because the combustion chamber is smaller.
So if you try and cut the 200 head to the 220 specs the spark plug would stick through into the combustion chamber about 3 to 4 mm, not a good idea.
Just a note, I have machined a 200 head here lately for a guy that want to experiment with high elevations 10,000 ~ 12,000 feet. I know this head will not work at sea level but at 2 mile high I think there is a chance. I have not heard anything back yet on how it works out.
Ron
If you look at a KDX 200 head, the entire combustion chamber and squish area are cast into it's shape.
When you look at a KDX 220 head you see that the entire combustion chamber and squish band are machined to it's shape.
If you have not guessed by now the 200 and 220 use the same casting and the only difference is the 200 head is uses the cast combustion chamber. The 220 head is a 200 casting and the combustion chamber is machined larger for the larger displacement of the 220 (the little dimple is part of the machining process).
OK...., now for the hard part for you to understand is, you really can not take a 200 head and machine it to a 200. WHY???? you ask, if the 220 head starts out as a 200...., why not.
The answer is that when the machine the spark plug hole and spot face it for the spark plug depth. the 200 head is machined deeper into the head because the combustion chamber is smaller.
So if you try and cut the 200 head to the 220 specs the spark plug would stick through into the combustion chamber about 3 to 4 mm, not a good idea.
Just a note, I have machined a 200 head here lately for a guy that want to experiment with high elevations 10,000 ~ 12,000 feet. I know this head will not work at sea level but at 2 mile high I think there is a chance. I have not heard anything back yet on how it works out.
Ron