CR500AF Sasquatch Build

n16ht5 · Nov 7, 2015

Go big or go home :face-icon-small-ton

97 CR500 motor completely updated to 2001, extensive porting and polishing, pulse induction, bored cylinder, lighting stator, polished billet stator cover and clutch cover, Hinson Racing clutch basket, PC Platinum pipe, custom wire harness, etc... transplanted into a street legal 2005 CRF250R frame powdercoated black with Pro Motion CRF450R suspension, Cyclops H4 LED equipped headlight, grip heaters, oversize radiators, Bulletproof Designs radiator guards, oversize pegs, etc..

Timbersled gets updated with double row bearings, a new 155" track with WPS extended rails, Cobalt Cycles custom third shock mount I designed with them for 20+ inches of travel, Arctic Cat tunnel cooler, and a custom 16" wide ski I made from 1/2" UHMW and a Gen I TS ski.

I fired it up and took it for a rip down the road... I was unintentionally spinning the 155" track in 3rd gear as soon as it would hit the pipe, just above idle :face-icon-small-sho. Makes my hi comp YZ450F feel like an XR200. Can't wait to get it in the snow.

jskattum606 · Nov 8, 2015

Bike should rip!
Hopefully your a big dude to handle all that track.

summ8rmk · Nov 8, 2015

With that assault track on firm snow, u will have that ski up in the air a lot.

GS6

summitboy · Nov 8, 2015

What jetting arr you running in your Pulse ? How do you like it ? Any stator mods ? Saw u on FB

pat84 · Nov 8, 2015

J&L Snowhawk · Nov 8, 2015

Your in for a surprise w that wide ski and big outside trackers. Straight ahead u go! Very nice build

kell8071 · Nov 9, 2015

Whats the story on the rear shock setup? It looks like the stock CRF shock with a billet linkage system that ties in with a new subframe section. I would suspect you would need really stiff valving and spring to handle that motion ratio and moment arm. Cool stuff for sure!

Kell

Tahoe54 · Nov 11, 2015

That's a sweet build, I have a ways to go it looks like.

summitboy · Nov 11, 2015

Chris what do u think of your Pulse ? Have u run it yet ?

n16ht5 · Nov 12, 2015

summitboy said:
Chris what do u think of your Pulse ? Have u run it yet ?

From the brief run I took down the road it rips your face off :face-icon-small-hap
Couldn't believe how hard it pulls now. Spinning the track on asphalt in 3rd gear is just a light twist of the wrist. Starts easy too. Sounds like "badabangbangbangbang" instead of ringadingding like regular. All the porting that Cobalt did helped I'm sure too.

Stator is a Moose 40w. Not sure where you can get them now

Not my first rodeo with a custom ski. It's not going to be a trail happy ski in any way, but it is going to float well.

The third shock mount is a prototype designed with Cobalt. I'll be testing it this weekend. The angle allows for MX sprung/valved shocks to work

olymon · Nov 12, 2015

I'd be curious to see hire that track rolls across that extension gap. Seems like the rails go up and then the rear wheels are much lower than the rails. Would it be brr to flip the extensions and continue the upward rail profile? for the shirt time you might be in hard pack it might make it easier to turn. Just an observation, hell, I don't even own a snowbike. :what:

Sent from my PC36100 using Tapatalk 2

n16ht5 · Nov 13, 2015

olymon said:
Would it be brr to flip the extensions and continue the upward rail profile?

Sent from my PC36100 using Tapatalk 2

I've been thinking about doing that, I think I will thanks.

I hooked up my thermostat. Does this look right? It's a KTM thermostat with the bypass plugged

summitboy · Nov 13, 2015

Let us know how the cooling works. One thing to keep in mind is the KTM stats i have seen so far not only have a bleed hole but also bypass fluid at the bell. The ones i used let a lot of coolant through and didnt really do much in the deep. Thats one reason i like the Thermobob setup. Just some food for thought.

portgrinder · Nov 13, 2015

you can take the t stat apart and with a punch, flatten out the notch where it bypasses. works slick. 30 second job.

summitboy · Nov 13, 2015

I also some older ones out of the 2002 300 exc i believe that didnt close all the way. If you can make it sealed u will have better luck with getting the temps up a little more in the deep.

n16ht5 · Nov 15, 2015

I would be worried about blowing hoses off if I didn't have some sort of bypass on the tstat. also, getting coolant through the tstat is required to get hot coolant from motor to it. I usually never have problems with a cold motor unless we are on the trail, otherwise it is overheating that I have problems with on most bikes.

Uncle si · Nov 15, 2015

You could use a hose bypass right Back to the head. I have a ski doo thermostat with a bypass hose on my KX500.

needpowder · Nov 15, 2015

n16ht5 said:
I would be worried about blowing hoses off if I didn't have some sort of bypass on the tstat. also, getting coolant through the tstat is required to get hot coolant from motor to it. I usually never have problems with a cold motor unless we are on the trail, otherwise it is overheating that I have problems with on most bikes.

I thought people had been running Thermo Bob's on fuel injected four strokes with no bypass for sometime and no problems?

summitboy · Nov 15, 2015

Only reason for the little hole is to allow coolant to pass so the system can be filled. You wont blow hoses of with a sealed stat. The bypass allows coolant to flow from the head to the waterpump inlet keeping the engine more /stable consistent. If you look on Thermobobs web site he has some great data on the bypass system. The 2 stroke engines run just fine at 90F in deep snow. Its the trail that gets hot temps. Just adding a stat wont do anything unless u have a way of cooling it such as a cooler in the tunnel.

n16ht5 · Nov 16, 2015

summitboy said:
The 2 stroke engines run just fine at 90F in deep snow. Its the trail that gets hot temps. Just adding a stat wont do anything unless u have a way of cooling it such as a cooler in the tunnel.

strange, the trail is the only place I haven't overheated. how could you overheat on a trail? I have a tunnel cooler and 2 oversized radiators. Maybe I will just run no thermostat? Seth have you run no thermostat? Otherwise I'll run the bypass back to the head, thanks

I finished up the ski

last year had some dirt riding... have any of you had luck heating up the plastic and smoothing the scratches out? when the snow is wet it loads up under the ski.

CR500AF Sasquatch Build

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