As I think about how ima rebuild my first lt250r, I wonder has anyone ever tried a custom Stroker crank? Is it too much of a hassle? Not too much Maybe 2mm the most, just to get a good low end. Idk how bad it will hurt the engine but it shouldn't be that bad. Many other bikes can get strokers, but I never heard of any LT250r being that. What y'all think?

Why do you want a stroker crank??.

Are you going to become another victim of all of the hype generated by those that may not look for what may be the best for their customers.

The engineers at Suzuki spent who knows how much money testing different bore and stroke combinations for the best power/reliability design.   Increasing the displacement by stroking does not guarantee that there will be more low end or any more peak power. Two-strokes do not respond to stroke changes like four-strokes.  Shops that build stroker crankshafts specialize in modifying or building stroker cranks to a customers specifications or request, not re-designing the rest of the engine so that the whole engine is more reliable and powerful.  If you want a 25mm stroker crank they will build it if there is a place in the crank web for relocation of the crankpin.  They do not care if the stroker crank is going to work with the rest of your engine and pipe combination.

Changing the stroke of the engine requires a complete RE-DESIGN of the whole power making portion of the engine to optimize the engine for the new stroke.  The ports, cases, exhaust system etc are influenced by the stroke. 

If you decide to go down the road of stroker cranks, find an engine builder that has spent a lot of money field and dyno testing to optimize the new engine design. 

I have NEVER seen a stroker crank that has the same outside diameter crank webs as the stock crank that is stronger than the stock crank.  Why increase the power of an engine and decrease the strength of the crank.  I get 5 to 10 calls a day from guys wanting to increase the power of their engine and wanting to keep the reliability of a stock engine.  This is not rocket science.