KDXRIDER.NET

Doing a total overhaul of my bike this winter and am tearing into my motor.Found out the head is a 200 but bored to a 220(69mm) the bike was running great,just wanted to put a new piston in it.So I looked at the pipes part# a little closer and its a rev pipe.Not having a 200 to compare it to,how would this motor act different from a 200,I have both rb head and carb mod.Now with having 200 porting and being bored to 220 should it rev like a 200 or 220,should I go with a woods pipe? Anybody have any other suggestions?

A 200 bored to 220 with a rev pipe should just scream. You tell me? Did it run good or did it feel like a dog?

juliend wrote:A 200 bored to 220 with a rev pipe should just scream. You tell me? Did it run good or did it feel like a dog?

Well I changed to a 47 tooth sprocket to keep the front wheel on the ground.Its fast but I dont know how a 200 revs out,it will rev pretty good but then flatten out,but then the kdx wont rev like a yz right?

".....but then the kdx wont rev like a yz right?"

Right!

does anyone have pics of what stock 200 porting vs. stock 220 porting looks like..

So your CYL says 198cc on it? Has the dome inside the head been re-profiled to fit the 69mm? I've often thought this would be the best way to make a 220 as kaw screwed up the porting anyway (IE even if your didn't touch the ports to handle the 69mm it would still be better off).

fuzzy wrote:So your CYL says 198cc on it? Has the dome inside the head been re-profiled to fit the 69mm? I've often thought this would be the best way to make a 220 as kaw screwed up the porting anyway (IE even if your didn't touch the ports to handle the 69mm it would still be better off).

Yes cylinder says 198L The ports look like they have been worked on.Dont know about the head but it was sent to RB that much I know.