Projects I have been on lately have been building a 05 KTM 450 SX for my 16 year old sonny boy... He has ridden a bit his whole life but was just ho hum about it until I bought the KTM to build for myself... He wanted to take a ride on it and I told him to be careful and told him it will probably scare the crap out of him... Oddly enough it was love and lust at first ride... So I told him it was his and he was going to strip it to the bare frame and rebuild it with me...
It was a great father son experience !! The KTM rfs engines have some of the best ports around , probably THE best , for making a hvp down draught intake port... And the dual exhaust ports are excellent also...
I have done a lot of KTM rfs engines over the years... Lots of them for tt racers... Always wanted one of my own... So I scored a heavy discontinued 14oz flywheel weight and went to town on a hvp raised floor epoxy port setup...
I have owned and modded crf450s.... And they were impressive... But this KTM setup is without a doubt the hardest pulling 450 I have ever owned.... The order of the day is short shift it and sit forward to fight the front end lift.... Sam thinks its a thrill... I think its obscene... Lol.... Above my skill level to make use of for sure...
Sam liked the idea of a father and son KTM clan... So I bought a fairly abused 02 KTM 250 exc 2 stroke..... Dads going retro with a 2 smoke...lol.... Found a rare NOS German DOMA KTM factory race pipe for it... So far that's the best thing about it...lol... Lots of work ahead...
Also new on the yfzcentral forum I wanted to show people in my how to port thread that 80% of the power gain comes from 50% of the port work....
I asked if any members had dyno tuned a carb and fuel injected model yfz and would be willing to send the heads to me in the name of technical info sharing.... A couple guys had and agreed and did send me heads... Minimal work for maximum gain.... I asked if they would photo document the heads when they got them back and then post dyno sheets after the re tuning post porting.... Agreed.... Heads are back in the mail this week...
Lots of fun stuff
