Well as some of you may remember a few months back, I had to split the cases on the trusty 89 KDX200 because the piston (stock!) shattered. I've had that part done for at least a month now, just had to save up some extra dough for the boring and replating.
I just finished putting the steed back together today with the Wiseco +2mm piston kit, and boy does the cylinder look good! Langcourt (http://www.langcourt.com) did an awesome job cleaning the cylinder, boring, and replating the cylinder. It really is spotless! Total cost was $235, with boring/honing/replating, shipping, wristpin bearing, and complete Cometic topend gasket set.
Back before the piston shattered, the exhaust valve teeth were completely gone and it was pretty dirty in there. After replacing the powervalves and "freshining" up the top end, boy does the bike run good!
The power is really great! Torque like a fourstroke (just about), and it seems like it will pull good on top as well. Still breaking it in, so I haven't been able to give it a good ride as of yet. I can easily do 3rd gear wheelies now w/out the clutch, 13/48 gearing. I think once it's completely broken in I should be able to do 4th gear wheelies no problem.
I had some concerns before with the clearance of the middle exhaust valve due to boring, but it clears with flying colors thank god. Also I was concerned that I may need to increase the head volume, but so far it isn't pre-detonating. I also advanced the timing just a tiny bit to prevent that. FYI, I'm running 94 octane with lead substitute, and Spectro SX 2smoke oil. Very clean burning at 32:1, not a spit of oil or smoke out the pipe! That is with 158mj, 48 pj, stock needle at 3rd clip. It already has PC Pipe, all smashed up though. I'm sending it out tommorrow to Pacific Crest pipe repair (piperepair.com) and then a Rad Valve I think is next.
I'm uploading pics right now, for those who would like to see what it looks like.
~Matt (one very satisfied KDX owner) :) :)
PS Sorry for rambling on, I'm just so excited that I finally got this pig running!!! ;)
I just finished putting the steed back together today with the Wiseco +2mm piston kit, and boy does the cylinder look good! Langcourt (http://www.langcourt.com) did an awesome job cleaning the cylinder, boring, and replating the cylinder. It really is spotless! Total cost was $235, with boring/honing/replating, shipping, wristpin bearing, and complete Cometic topend gasket set.
Back before the piston shattered, the exhaust valve teeth were completely gone and it was pretty dirty in there. After replacing the powervalves and "freshining" up the top end, boy does the bike run good!
The power is really great! Torque like a fourstroke (just about), and it seems like it will pull good on top as well. Still breaking it in, so I haven't been able to give it a good ride as of yet. I can easily do 3rd gear wheelies now w/out the clutch, 13/48 gearing. I think once it's completely broken in I should be able to do 4th gear wheelies no problem.
I had some concerns before with the clearance of the middle exhaust valve due to boring, but it clears with flying colors thank god. Also I was concerned that I may need to increase the head volume, but so far it isn't pre-detonating. I also advanced the timing just a tiny bit to prevent that. FYI, I'm running 94 octane with lead substitute, and Spectro SX 2smoke oil. Very clean burning at 32:1, not a spit of oil or smoke out the pipe! That is with 158mj, 48 pj, stock needle at 3rd clip. It already has PC Pipe, all smashed up though. I'm sending it out tommorrow to Pacific Crest pipe repair (piperepair.com) and then a Rad Valve I think is next.
I'm uploading pics right now, for those who would like to see what it looks like.
~Matt (one very satisfied KDX owner) :) :)
PS Sorry for rambling on, I'm just so excited that I finally got this pig running!!! ;)