rb designs head mod

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#1
Has anyone ever done the head mod by RB Designs on a KDX 200? It's only 40 bucks and it looked like it would give me a good improvement for the money so I was gonna check on here for some feedback.
 
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#2
They "simply" mill off about 3/4 of a mm & recut the squish area --Out here in the high country it's mandatory to do this to restore compression. The #1 way to more power is compression and it should still run fine on premium pump gas. Higher compression rearranges your power more towards the bottom to mid range with just a bit of top end loss -it just won't rev as far. Supercross engines run much higher compressions yet [and require race gas] but pull really hard down low.
 
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#4
You can get a good explanation of the squish band...what it does, how its size/angle effect performance..on EG's site.

OK...it used to be there....I didn't go check to see if it still is.

It's not so much the 'dome' (if you're referring to where the plug is) as it is the ยบ at which that 'dome' is 'blended' into the piston crown area. It's at the edge of the combustion chamber. A lot of magic going on there regarding turbulence, flame propagation and 'stuff'.

An input of "squish band" on google gets you about 1000 hits........
 

Roland C

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#5
click here for a brief description of squish band.
 
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#8
If you didn't check the above link, you missed this:

'There are quite a few things that can be tweaked in the combustion chamber to change performance (notice the word "change"..... not necessarily "better" or "worse".... everything is inevitably a compromise). '

I don't know what you're expecting as a result. If, after you talk to ron about it, it sounds good to you......do it. Ron won't steer you wrong.
 
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#9
Originally posted by crazykdx
so.....that would be a good thing to go ahead and do, right?
Yes, especially if you ever decide to go next door and ride with us here in Colorado -- and,
it will get you more low to mid power there too.