03 Pro xr to rmk conversion questions

Hello, I have a 2003 prox 440 race chassis with a trail converted 800. I basically am making this into a rmk type machine. I have riveted onto the bulkhead a 151 tunnel and and placing a 151 rmk skid stretched to a 159 with 2.25 inch track.

This has been quite the learning experience but have enjoyed getting to know my sled. I have a few questions if anyone may have any experience. I wanted to keep the prox bulkhead and taller handlebar position etc so hence the extra work but wanted the longer tunnel and cooling from rmk tunnel etc

I have gotten to putting the motor back in and trying to figure out custom cooling options as the cooling now runs through the foot rails as opposed to the top of the tunnel. From what I can see the best option I have is to hold saw a hole in the bulkhead to run heater hose through in order to route to prox cooler etc as a bit different vs front rmk cooler. I know rmk bulkhead has such a "hole" or space. The other option I see is to flex this hose around clutch to bellypan and over entire motor but don't like this option. Anyone do this before? Advise not too? Suggestions?

Also was looking at geAring around 21/43 giving me 2.05 ratio which seems about right and can keep same chain. Current setup is 24/41 (1.76)which I know is way too high.

Also any suggestions on airbox? I have one off 800 and doesn't fit. From my understanding the only one that will fit is 440 airbox and cut holes to fit carb. This be sufficient enough? Currently just some k&n on there but was thinking box of some sort would be better to get cold air. Thoughts? Suggestions?

Live in mn but going to steam boat springs co in feb and trying to get setup for there, ditch bang some around here. I understand different keys and weights once out west.

Any input or suggestions on project would be greatly appreciated. I am pretty new here and love the forum

Thanks for your time.

Korey

Oh yeah. Had to try my first airbrush and didn't turn out too bad. A fair amount of Autobody experience, just not custom snowmobile assembly (couldn't get pic to load from phone but can from my computer later.)

I really appreciate the reply. I am going out now to work on the sled. The 800 box is too wide. I have located a 440 box and will try to get tomorrow.

So drilling the hole in bulkhead won't be an issue for strength etc? That is what I was gonna do under the driven and work the hoses with brass fittings and heater hose.

Could you clarify on bottle height? Didn't know this could be an issue. I do have brake cooler as well.

Not sure what u cooler is (guessing what I have). I wanted to use the foot rail and rear rmk coolers as well for increased track clearance like you mentioned.

So how do you like the setup?

I have been procrastinating the finish part here cooling etc but need to get it done. I did notice the 3 on rmk front cooler and was wondering why etc. the cool seize makes sense. I will make sure to warm up good. Maybe put inline temp gauge and warm to certain level?

Thanks again

Not sure if doing this right but had sent you reply to post as well. The description of water flow you mentioned is different than what pro x was setup but sounds a lot easier. I do know only 2 exits vs the 3 in the rmk

I appreciate your reply and help

Any special clutching setups that work best for this setup? Such as primary spring? Secondary setup? Maybe stock helix just fine? Thank you