4 Stroke Your KTM Overheat?

I have the 2007 450 EXC and every now and then when it's warm outside and especially at altitude the pumpkin starts spewing coolant. I am in technical, steep, and slow conditions when this happens. The first time it happened I thought my bike was done. I researched and found that these high dollar bikes don't come with a coolant recovery system or cooling fan and so they puke from time to time. I have installed a Coolant Keeper System recovery tank (Works great!) but wonder if the cost of the cooling fan is worth it for the few times I experience overheating?
 
make sure it has been re-jetted... the bikes come lean from the factory

and, if it is a few times of puking a little bit of coolant, I wouldn't worry about it, as long as you top off when you get the chance

(this is not a slam on pumpkins)

KTMs overheat... they are "ready to race" AND meet emissions tests... re-jet, and it'll be better... guarantee it 90% :devil:

the other 10% needs a fan and a recovery bottle... check out the turkey baster mod... that's what my DRZ has (not that it has ever needed it... I ride easy trails for the most part)
 
:lol:
I ran the dog pee out of an XR4 in 93F heat this past week, and I never had one coolant issue!:smirk:

:devil:
Another thing to do beside the jetting, coolant catcher and fan, is to make sure you are geared right for the conditions. If you are geared a tad tall, you will over heat. I use to run my KX500 with desert gearing up in the mountains of Kennedy Meadows and I would puke water, I found an old Tecate (Kaw 250 quad) counter shaft sprocket that dropped the gearing down 2 teeth up front. This allowed me to run in 3rd and 4th gear through the trees and the bike never puked after that.
 
I used to have the problem. I started using Engine Ice, a new 1.8 cap, turkey baster over flow tank, and on my 525 a fan on each rad. The fans never come on tho. I used to run a rad shop. The caps go bad and people dont realize it so i replace them if i start having a problem on a new to me bike. Ive added the Engine Ice and turkey baster to all my bikes, two strokes included, and no more issues.
 
I ran the dog pee out of an XR4 in 93F heat this past week, and I never had one coolant issue!:smirk:

:devil:
Back when I would ride no matter the temp I had an issue with my 81 XR500. In some technical singletrack at about 105F the bke started running really rough and then came to a stop. I looked down and gas was shooting out the carb vents. The gas was boiling in the float bowl.

Now back to the subject at hand. If you are riding first gear tech stuff on a hot day you may still have issues even after jetting richer. There just isn't enough air going through the radiators to remove the heat. The only fix for that is a fan.
 
the fan is worth it if your going to ride tight nasty stuff all day or every ride. the cost for the fan is less than a new motor for your high dollar fourstroke.
 
when i ride tight stuff my bike gets hot and i have to use my hot start to get it to kick over and it seems to run funky after i use it a fan sounds like a good idea never thougt to put one on. i have a wr400 any sugestions on one that works well ?:thumb:
 
when i ride tight stuff my bike gets hot and i have to use my hot start to get it to kick over and it seems to run funky after i use it a fan sounds like a good idea never thougt to put one on. i have a wr400 any sugestions on one that works well ?:thumb:
Does this model have a overflow tank like my WR '07?
 
yep it shure does.it doesn't seem to loose any thing , far as i can tell all is well just doesn't like to start without the hot start when i'm puttin around.
So maybe the answer is a fan. Any of you mechanical types out there care to join in?
 
:lol:
Another thing to do beside the jetting, coolant catcher and fan, is to make sure you are geared right for the conditions. If you are geared a tad tall, you will over heat. I use to run my KX500 with desert gearing up in the mountains of Kennedy Meadows and I would puke water, I found an old Tecate (Kaw 250 quad) counter shaft sprocket that dropped the gearing down 2 teeth up front. This allowed me to run in 3rd and 4th gear through the trees and the bike never puked after that.
So maybe the answer is a fan. Any of you mechanical types out there care to join in?
Besides the things I mentioned above, I would make sure that you change the coolant on a more regular basis. I run Engine Ice and it works great, but I change it out a couple times a season so it is always fresh. Thumpers are a bitch when hot to start, that is why the hot start lever. ever watch supercross when one of those bikes stall, they kick and kick. Those things get hot and don't start. On my 07 YZ450, my lever is for cold starting and not hot starting. The key is to get the kick starter at the top and have a good healthily kick through. Having long legs like I do helps. Geekster, remember are last ride when we at the hill climbs and the larger guy was struggling with that hill and then could not get his bike started? His buddy came back and kicked forever. I felt bad, so I offered my leg and one kick lit it up. just need to power through the stroke...
 
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