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KDX 200 head mod

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My brother was looking for a step up from his xr200 so I steered him in the kdx direction. He found a nice 200. It has a gnarly woods/pc2 silencer.  I removed the air box lid & jetted it. Also installed weight appropriate springs & did the shim stack mod. Bike runs pretty sweet he's just a short shifter & would have probably been better suited to the 220. I mentioned getting the head modded & some reeds for a little more bottom end. Anyone have any experience with the rb head mod on a 200? Does it make a noticeable difference?

Edited by bigmatthew46
Miss spelling

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No on the RB head work for that one.   If it is worn enough,   simply over boring it and having the head sized for it will make it a short shifter's dream,  with the added advantage that it has a larger carburetor than a 220.  It worked really well for a young woman I know.  EGorr was reasonable,  but unless his is worn enough like hers was,  you hate to do that to a nice cylinder.   maybe borrow it?

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ossa was talking about the cylinder not the head.  you could correct the squish on the head (RB can do it).  it would clean it up a bit and maybe boost the low end some, its a pretty cost effective mod usually less then $50 for the head to be cut.  reeds wont make much difference unless the ones in there are damaged.

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Yes I know he was. The cylinder is perfect & has a new weisco so there won't be any boring right now. I was talking about the $50 head mod for a 200. Seems that & carb are very popular for the 220 but not a ton of info on the 200. Having the 35mm carb I don't see having it done. Just trying to boost the low end a little.

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Emailed RB & the man himself said the head alone on the 200 won't do much. He suggested the carb mod. In the meantime he picked up a del needle & a 152 main. It's running 155/42 stock needle 2nd clip & is still a little rich on the top end. We'll try to jet it a little cleaner & then he can decide if he wants to spend the money. I have to swap bikes with him sometime to blow it out for him. I don't mind.

20170318_185941.jpg

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Nice bike , Here is my 2 cents on more low end ,  same bike 95 bought new never change the needle you have , your jetting should be close go third clip ,make sure you air fuel screw is adjusted I live  above you here in NC , should be around 1.5 to 1.75 turns out . What oil ratio are you running 32-40-50-100 to 1 . Any way on my bike for cheap low end you can do 12 or 11 front sprocket , 11-47 , 12-50 dose reel good did the 11-47 for many years, the Jeff FRD pipe ring gives alittle more , get the 607 dual stage reeds makes big difference , moose reed spacer or you could make 1/4 for reed block , and last free mod on the stator advance the timing 1/6 to 1/8 past the timing mark , hope this help , If he does not like the bike , I would like to have it for a spare.

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I did the RB head and carb mod and installed it as delivered. It was a significant power boost but more of a mx type delivery. Had a bog off of idle and used twice as much gas. Not good for woods riding but would be fun in open fast riding. I changed the jetting and put the stock needle back and I like it much better. It is a good but not dramatic power increase, sort of like when you replace the stock pipe with fmf knarly.

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