Willasan
New Member
That would be appreciated. I'm a bit curious myself.
reenmachine
Member
Please do!
ArkansasDave
New Member
It's seems to fit but would leak(cold without the engine running) it may be that my other cap needs to be replaced(not far fetched). So buy at your own risk. I am going to buy a new cap for my crf450r and go from there.
Anyone else have the coolant from the reservoir leak out when you take the cap off?
Anyone else have the coolant from the reservoir leak out when you take the cap off?
ArkansasDave
New Member
Another note of interest, within 5 seconds of shutting off the bike and leaving the screen on it jumped up 2 bars. Also after 10-12 minutes of idling the fan never once kicked on and it stayed 3 bars below the hot section.
MrGrody
New Member
Still haven't had a leak or overflow. It was 104° during my ride yesterday. Kept checking the coolant reservoir everytime I stopped and nothing was happening. With as many people reporting issues I would have thought it would have happened yesterday for sure.
Willasan
New Member
I bet something is up with my/our cap. Did you happen to see what the temp read when the bike was off?
Willasan
New Member
Was this with the stock cap?
MrGrody
New Member
All bars solid except those last ones that are separated from the bunch. Hottest it's ever read... no puke
ArkansasDave
New Member
Yes, stock cap. I'll have a new cap for the crf450 next week. It's a 2.1 bar cap but I'll if it fits better on the Ktm.
Willasan
New Member
Definitely sounds like I've got a partially faulty cap.
reenmachine
Member
This is normal. With the bike off there's no coolant flow and the coolant around the sensor is just sitting there heat soaking.
reenmachine
Member
I don't think so. I think it's the altitude affecting us. I'm going to try and find a 1.6 bar cap locally so I can try it this weekend. It's 105° up here too so I'll get it plenty hot here in town at low elevation before and after the swap and then head for the mountains.
ArkansasDave
New Member
I know it was just an observation, I've never seen something jump 20-30 degrees instantly though.
D
Deleted member 351
Guest
I'm having the same problem. It kept puking coolant almost every time that by the end of my fourth ride there wasn't any left in the bike. I ended up having towed it to the dealer to let them look at it. After leaving it there for a week they still couldn't reproduce the issue. They said they are most likely unable to reproduce it since they put different coolant then what the bike comes with from the factory, but they were probably not riding it long enough. Apparently they have a three mile limit unless you give them the ok to ride it more. I'm picking up my bike today. My commute home is 45 min and it looks like it is going to be fairly warm. I guess I'll find out if the problem still occurs.
KTMGene390
New Member
I would take pictures or video if it happens next time. Take a picture of the temperature gauge as well as any coolant that is spilling on the ground. This will give the dealer and idea of the extent of the problem. I would note whether the fan was on or not before turning the bike off and take a picture of the coolant level with the bike level to show it is at the proper level and not overfilled when cold.
ArkansasDave
New Member
Or when you pick it up from the dealer tell them that you will ride it around will aggressively and bring it back in. Then go ride it really hard and then pull into the garage and turn it off with as little light load running as possible.
Willasan
New Member
Update: Spoke to my dealer, and his RC390 has never puked on Palomar. He's of the opinion that the cap was faulty. We replaced the cap with another OEM one under warranty, and I rode Palomar again HARD this Tuesday trying to get it to puke. No puke this time. However, it was significantly cooler. My first few runs were in the mid 70's, all the way to my last few in the high 80's. Not 100% on this as a fix YET, but I'm very hopeful.
gbabyracing
Member
When you shut the machine off you are no longer circulating coolant. The temps are going to rise. When the temps rise the pressure in the system will increase. The stock caps are typically rated at 1.3 bar. Beyond that setting, they open to relieve pressure. Race bike mechanics may up the cap pressure to 1.6 or sometimes more to move the relief point out a bit further. We are required to shut off our hot bikes when endurance fueling. I use a higher bar cap and if the air temps are really high we will put a box fan on the motor as well. Raerly if ever do we have a puke on our big bikes.
Try this, when you come to a stop the fan will probably come on, leave the bike running till the fan goes off, Then shut the bike down. I bet it doesn't puke. It will have been allowed to cool some.
Try this, when you come to a stop the fan will probably come on, leave the bike running till the fan goes off, Then shut the bike down. I bet it doesn't puke. It will have been allowed to cool some.
Willasan
New Member
I've tried that fan trick gbaby, no dice. I truly am hoping my original OEM cap (it says 1.4 bar on it) was just a little bit faulty/weak and letting out coolant earlier than it should have been. I even had the bike puke once after idling for almost 5 full minutes to let the motor cool down a bit. Hopefully it's a simple fix with a new OEM cap. When I do some true hot weather testing this weekend, if it's still puking, I'll try a 1.6 bar cap. My dealer who also owns a 390 and regularly rides where I do has never had this problem (so he says) on his bike. If that's true, something is up.
reenmachine
Member
That would be nice if it turned out that we just got OEM radiator caps at the crappy end of the quality range.
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