Seeing that I received lots of advice from here last year on rebuilding my kx5 to a snowbike thought I would post a video so you can hear the final product in action.
Bike was a 91 I bought for 2k CAD in fair to rough shape. Split the cases and rebuilt the crank with a vesrah rod kit. New main bearings and seals, new tranny bearings throughout. Thankfully the tranny itself was in excellent condition. The clutch, not so much. Full replacement minus the pressure plate, only thing salvageable. Rebuilt water pump, new rads. Cylinder was in fine condition so new top end and rebuild of the pv was all that was needed there.
Cleaned up the transfer ports, there was quite a bit to improve on there and polished up the exhaust. 0.2mm head gasket bringing the squish down to 1.7mm from the crazy 2.5mm it was.
Desert gnarly pipe and powercore exhaust.
Intake is a pod type with just a prefilter over it to keep the snow out. Boyesen pro series reeds.
Intellajet installed on carb for altitude and load tuning. Carb has
55 pilot
N82m 1 St clip
150 main
This summers mods to include head work to tighten squish a hair more and get a decompression button for some easier cold starting and a rad valve since my intake boot is getting on it's last legs.
https://youtu.be/AABMMPawZgw