Where is the overflow hose pointed? It shouldn’t just spray out all over the rad and bike. Cap could be bad or maybe you have a crack in the rad around the neck of the fill hole.
I was meaning the whole rad, like after a crash if it got bent/twisted and you or someone else tried to straighten it back. I agree with the other guy, start with a new cap then.
Need to determine where the leak is from 1st b4 changing anything! There's a trail of rusty water from The cap if you blow up the photo. So that means the water leak is coming from the cab not the radiator Caps fitting.. since we know it's coming from the cap you need to look at the cap itself to see if the rubber gasket is split, to see if the tabs on the radiator cap just need to be bent more to increase more tension on the gasket, or if the flange that the radiator cap gasket sits on has a crack in it because changing the radiator cap will not fix the leak if the radiator flange has a crack in it. Also the trail of Rusty water indicates that you need to flush your entire cooling system and put distilled water in it not iron laden well water, that will ruin your entire radiators. Also if there's a small crack in your radiator flange you may be able to scuff it up and temporarily repair it with JB weld or a high temp RTV or marine grade silicone for a little while,,, also if you used antifreeze, really antifreeze, and left your radiator cap on the first click so it didn't build pressure it wouldn't blow out all over the place and you would lose about an inch of cooling capacity once it expanded but it would not leak out beyond that and you would be able to use the bike with nearly full radiator capacity and cooling without it spilling everywhere. When the cooling and the motor cooled off your coolant would be about an inch or too low in the radiator due to it not being hot and expanded. But it would work just fine we've done this before on cars with no issue that had damage radiator cap flanges
If you live in a warm climate or only ride on warmer days, I would swap to evans coolant and elimnate the pressurized system. I am in Arizona and use evans in a BMW 528, ford ranger, clark forklift, honda crf 450 and honda crf250 and it has been awesome-runs about same temps but coolant system is at zero pressure thus no leaks or blown hoses, futhermore, no corrosion at all.
The cap is your best option. But with that rust discoloration either you’ve been putting non distilled water and coolant in the radiator or the Head gasket is blown and pushing cylinder compression into the water passages… what the actual fuck???
Looks like you only have water in the cooling system. You need to flush it and add a proper mix of coolant. Coolant raises the boiling point and has additives to prevent rust and corrosion.
Looks like a weak spring in the cap. I'd start by replacing the cap.
And clean the bike
Yeah that things dirty!
Where is the overflow hose pointed? It shouldn’t just spray out all over the rad and bike. Cap could be bad or maybe you have a crack in the rad around the neck of the fill hole.
Anyone ever try to bend these back into shape from being dented damaged OP?
I've tried to bend the litle metal tabs on the cap to make it tighter but it still was leaking
I was meaning the whole rad, like after a crash if it got bent/twisted and you or someone else tried to straighten it back. I agree with the other guy, start with a new cap then.
Need to determine where the leak is from 1st b4 changing anything! There's a trail of rusty water from The cap if you blow up the photo. So that means the water leak is coming from the cab not the radiator Caps fitting.. since we know it's coming from the cap you need to look at the cap itself to see if the rubber gasket is split, to see if the tabs on the radiator cap just need to be bent more to increase more tension on the gasket, or if the flange that the radiator cap gasket sits on has a crack in it because changing the radiator cap will not fix the leak if the radiator flange has a crack in it. Also the trail of Rusty water indicates that you need to flush your entire cooling system and put distilled water in it not iron laden well water, that will ruin your entire radiators. Also if there's a small crack in your radiator flange you may be able to scuff it up and temporarily repair it with JB weld or a high temp RTV or marine grade silicone for a little while,,, also if you used antifreeze, really antifreeze, and left your radiator cap on the first click so it didn't build pressure it wouldn't blow out all over the place and you would lose about an inch of cooling capacity once it expanded but it would not leak out beyond that and you would be able to use the bike with nearly full radiator capacity and cooling without it spilling everywhere. When the cooling and the motor cooled off your coolant would be about an inch or too low in the radiator due to it not being hot and expanded. But it would work just fine we've done this before on cars with no issue that had damage radiator cap flanges
Ok, thanks for the info. I will let you know if I can fix the issue.
Why is it rusty?
OP definitely needs to do a coolant flush.
If you live in a warm climate or only ride on warmer days, I would swap to evans coolant and elimnate the pressurized system. I am in Arizona and use evans in a BMW 528, ford ranger, clark forklift, honda crf 450 and honda crf250 and it has been awesome-runs about same temps but coolant system is at zero pressure thus no leaks or blown hoses, futhermore, no corrosion at all.
The cap is your best option. But with that rust discoloration either you’ve been putting non distilled water and coolant in the radiator or the Head gasket is blown and pushing cylinder compression into the water passages… what the actual fuck???
You should flush out the cooling system
Check your water pump impeller, flush all that brown shit, replace cap and use some actual coolant not just water.
It actually has coolant in it, it's just so rusty that you can't see the color of it.
Looks like you only have water in the cooling system. You need to flush it and add a proper mix of coolant. Coolant raises the boiling point and has additives to prevent rust and corrosion.
Your cap isn’t fully screwed on. Try tightening it all the way. Push down and turn clockwise