So currently I have a 1990 KX250 completely torn down to be turned into a motard road racer. The thing sat for about eight years so the engine also has been completely torn down.
So here is my current dilemma, I need a bike with at least 55hp to run with the tractors, I have collected parts to make the 250 engine into a 295. The 90 cylinder has a steel sleeve and from research 265 seems to be the biggest they are taken out to but I picked up a 93 top end complete and they can be bored to 295. In the states this usually costs 600 to 700 bucks, there doesn't seem to be too many places in Australia that really advertise their work on 2 strokes and by the time I post and exchange Aussie pesos for greenbacks, I am looking at a bit over a grand. I have an Aussie company that will do a 295 top end full rebuild for $1100 so I think I will talk to them. Also since I have a 93 top end I need a 72mm stroke crank as the 90 Stoke is 70mm. I picked up a 92 crank that needs a rebuild which I was planning on doing anyway with a new rod and a balance. Dimensionally the cranks are the same except for the stroke. I have mocked them together and they look like they will go together alright. I also have a KDX transmission to go in as I also need to be able to do 180-190kph down the straights. All up I am probably looking at $2000 for the full rebuild.
But there is an 86 500 engine for sale near me for $1500, it's a runner and comes complete. Also has a lectron carb. I have the skills to fit the 500 engine into the 90 frame, I just don't know what to do!
What do you guys think?