Thermostat Coolant line Routing

[wonderdummy]

Just rode my CR500 for the first time yesterday and was getting fairly high temps mainly fairly easy trail riding at -24C. The bike would steadily climb to
190+ before I would shut it down. The more I read this seems more normal. What bothers me is its steady doesn’t seem to slow down once the thermostat opens at 130F (removed the thermostat and no change). So now I am questioning how I routed my lines that I might not be getting enough flow to one of the rads. As you can see in the pic I don’t have equal length hose from where I spilt the lines wondering if anybody has had issues with this? or if it isn’t a big deal? I am also going to replace the tee with a Y.

 

[portgrinder]

that setup should work fine. shoot both rads with a temp gun and you'll know for sure.

they do heat up if you are going slow and have lots of load on them. in the morning is the worst when you are going uphill with lots of fuel weight

 

[summitboy]

I will see temps 200+ up the trail. It won't boil over unless its higher which i don't see. The stat is useless on the trail. Helps the bike warm faster thats about it. I really don't think a stat does much on the CR500. Maybe if it was -20C and in the deep snow. IMO it would have to be a true closed system for it to work well. I had two 55C KTM stats and they let to much fluid by. I saw no difference what soever with them in the bike in the deep snow.

 

[kell8071]

I have been seeing some real high temps on my cr500 on the trail, up to 240 range but since it hasn't been spitting coolant I haven't worried too much.

Before I put my t-stat in I was hardly staying above 100 in the deep. Now I fluctuate around 130-180F. I do run a ball valve on the Lh coolant line that I can close off if I'm deep snow too.

 

[mtn-doo]

I will see temps 200+ up the trail. It won't boil over unless its higher which i don't see. The stat is useless on the trail. Helps the bike warm faster thats about it. I really don't think a stat does much on the CR500. Maybe if it was -20C and in the deep snow. IMO it would have to be a true closed system for it to work well. I had two 55C KTM stats and they let to much fluid by. I saw no difference what soever with them in the bike in the deep snow.

If you seal the leak ports as Avid does with their system, you have a true closed system. The Thermo-Bobs have a 1mm leak port. Not a sealed, closed loop system. Keeping a closed loop system will boost your temps in the pow. Keeping coolant from flowing through those radiators in the pow makes a big difference. Without a sealed stat, you are sending cold fluid into frozen aluminum radiators making things worse. The closed loop is all that is needed in the pow. The rad's don't get used much.

 

[summitboy]

I don't have a problem with my CR running. It has piles of power and runs clean in the deep. My temps stay in the 100-120 so far in the deep. Having a stat in the system to boost my temp up a extra 10F won't do anything for my bike. I could maybe see a problem if I'm riding in -20C which doesn't really happen in my riding area. I haven't even used a carb jacket this season yet but have one just in case i have to run in ultra cold temps.

No point having a stat that is prone to failure in the system if it isn't needed imo. If I'm gonna start adding stuff into my setup then i might as well run a cooler and stat and nix a rad. Seems like the most stable setup.

I think if we all monitored temp in the summer on the dirt and sand you would see major coolant swings in the upper end. We are just scrutinizing it so much now because the low end temps need to be brought up LOL

Funny about the Thermobob stat. Bills stats used to be sealed. He told me he sealed all the holes. Maybe in these smaller housings he thought a bleed hole wasn't a detriment. My non bypass KTM 55C stats did nothing for me. They let a pile of fluid by so i yanked them. Never replaced them lol

 

[M5-]

I've been watching the temps on my CR500 constantly over the last 4 rides. When my primer was leaking I couldn't get the bike above 90 degrees in the deep, as in 2+ feet of fresh, and maybe 120 on the trail, air temps were about 10F. Yesterday it was more like 25F up top and my bike ran at 120 in the deep as long as I was on the pipe. Coming off the pipe it'll drop to 90 ish but then comes right back up. Trail temps have been in the 140-160 range depending snow load. The bike flat out ripped all day yesterday. I don't see that adding stats is going to help my cause much so I'm going to keep running it as is. My goal for this bike was/is cheap and simple.

M5

 

[Uncle si]

In temperate Washington, I went to a tunnel cooler and a bypass thermostat from a ski doo xp.

Temps would jump quickly above 240 with the stock cooling system on my kx500.