Hello all, I am currently reworking a 99 ZRT 600 that I bought last year. Its had an unfortunate history of "excellent" tuning which led to a grand combination of a highly rich mag cylinder combined with a burned down pto cylinder which caused a muffler fire! I am a big fan of the ZRT's and chose to resurrect the beast.
For the engine: Stock stroke and bore, planning on SPI pistons (i hear these should hold up fine) with teflon skirt coating and ceramic on the domes, possibly shaving the heads 10-20 thousandths, light jug porting (mostly to "bell" out the ports to allow better air transfer as sharp edges dont promote airflow, and to more closely match the port size to the opening in the cylinder, no port timing changes), Vforce reeds, 38mm carbs (UFO's have been thought about), Black Magic Pipes, stock crank (replaced bad bearings, trued, welded at the press joints as my dads 98 came apart at the mag end), 2 degree timing key, stock 9 post primary, roller secondary, and 15Wide 20-39 gears in the chaincase.
First question is: what is the concensus on fairly reliable engine rpm? From my research it looks like the ZRT600 is the pretty much the shortest stroke of the Cat engines which should lend readily to higher rpm without problems. Also from research it seems that the Black Magic pipes and PSI pipes are tuned to ~9300 rpm. I was thinking on dialing the sled in to engage at ~6-6500 rpm and peak ~9300 rpm... Ideas??
Second is in regard to clutching: which is an obvious battle, i was going to break the engine in on stock 99-2000 clutching and pipes. But i thought due to the higher rpm demands of the Black Magic pipes i may switch to a setup similar to the ZR440 Sno Pro's for a baseline... Ideas??
Any help to get some bearings with regards to this would be greatly appreciated as i would hate to burn down a fresh engine becuase i didnt ask the knowledge bank!!