I’ve been looking at what engine I’d like to run for next year for road racing to replace the 80cc Honda. I’ve looked at Honda CR125R’s, KZ’s, ROC shifters, etc. Here are my notes, however misguided they may be:
Honda’s are the most reliable 2-strokes, but being old parts are getting harder to find in good condition. They don’t have as much top end as the other purpose-built kart engines, but have a little broader power band.
ROC shifters seem to be sort of in-between, but still require quite a bit of maintenance (rebuild top-end every other race).
KZ’s have the most top end HP, but are the least reliable of the bunch. Win some races, blow up and DNF others.
So what about going 4-stroke instead? Why in karting is the LO206 deemed as a good thing, but anything else 4-cycle shunned?
I saw Honda showed a CRF250R in a kart at SEMA last year. So why not run a CRF250R or something like it? New or relatively new engines so great parts availability. Similar top end power to a 2-cycle 125. Longer rebuild times (about 30 hours for ring replacement, 60 for a piston). Wide power band. And even electric start “TAG” with the newer ones.
What am I missing here?