High Temp

[Dirty Blaster]

I have a Vector kit installed on my blaster and recently after running it for 20+ minutes of normal riding the engine temp light comes on and gets higher than normal. The radiator looks like the coolant is going to start spraying out once it reaches a certain temp;

Im running high octane gas with 40:1 synthetic. It runs fine but it seems its running too hot. I checked out many components and im not seeing any problems. Any suggestions or questions ?

 

[Larry's Shee]

What in the smurf is a Vector kit? Linc maybe?

 

[Larry's Shee]

Ok, I found a Vector kit, still confused about radiator tho

 

[Dirty Blaster]

Vector is just a speed/distance/rpm/oil,air,engine temp electronic gauge. the radiator is for the liquid cooled head

 

[Blaaster]

Have you done a leak down test it, air may be getting in somewhere?

With a slightly lean mix it may seem to perform well, but could be slowly doing damage.

40:1 premix seems little light on oil to me, try a 32:1 mix.

 

[Larry's Shee]

Well finally someone with the watercooled head I:I Be ready for a ton of questions. Is this overheating developed recently? What does your plug say? How much compression and type of fuel?

 

[Dirty Blaster]

Have you done a leak down test it, air may be getting in somewhere?

With a slightly lean mix it may seem to perform well, but could be slowly doing damage.

40:1 premix seems little light on oil to me, try a 32:1 mix.

Before running it again ill do a leak down. Just seems like this is a more simple problem im not catching.

Its always ran at 40:1 but I did fill it up with 2oz more today and the temp still shot up way too fast.

Well finally someone with the watercooled head I:I Be ready for a ton of questions. Is this overheating developed recently? What does your plug say? How much compression and type of fuel?

Overheating started couple days ago. The temp rises much faster than normal and I know this vary's, but its runs up to about 375 degrees within 20min. At 350 the coolant begins to come out the overflow tube.. Should not be doing this.

Compression seems fine :-[

 

[Blaaster]

Before running it again ill do a leak down. Just seems like this is a more simple problem im not catching.

Its always ran at 40:1 but I did fill it up with 2oz more today and the temp still shot up way too fast.

:-[

By adding more oil you have effectivly made a leaner air/fuel mix which will burn hotter, more oil= less fuel.

A leak down test will tell you a heap of things, and it is prolly the simple diagnosis that you are avoiding.

 

[Dirty Blaster]

Did a leak down, there are no air leaks. The only thing i found is when i took the exhaust off the cylinder there looked like oil leaking and the O ring/seal was broke.

This may not be causing the overheating but maybe it was the clicking noise i was hearing :-[

 

[EZRider76]

By adding more oil you have effectivly made a leaner air/fuel mix which will burn hotter, more oil= less fuel.

A leak down test will tell you a heap of things, and it is prolly the simple diagnosis that you are avoiding.

Wait, did you type that right, more oil makes it leaner? I thought lean or rich has to do with AFR? You only add the oil for lubrication of cylinder walls to reduce friction. I thought the higher the air in the ratio means it burns hotter.?.? Adding more oil just changes the premix, which should have nothing to do with lean or rich as long as the AFR is the same, and that would have to do with the jets allowing the right amount fuel vapors and the air filter allowing the right amount of O2 to properly mix the two, so that during combustion all the fuel is burned up and all the Oxygen is used up, leaving only the carbons to be expelled out the exhaust. I mean, I'm relatively new to understanding all of this, but all of my research and reading tells me this. More O2 will make it rev and burn hot, so look for an air leak from Carb to Cylinder...remember, fire needs three things; ignition (spark), food (fuel) and oxygen (air)...the more air you add, the hotter it gets for a longer period of time....at least in campfires that seems to be the case.

 

[Blaaster]

Wait, did you type that right, more oil makes it leaner? I thought lean or rich has to do with AFR? You only add the oil for lubrication of cylinder walls to reduce friction. I thought the higher the air in the ratio means it burns hotter.?.? Adding more oil just changes the premix, which should have nothing to do with lean or rich as long as the AFR is the same, and that would have to do with the jets allowing the right amount fuel vapors and the air filter allowing the right amount of O2 to properly mix the two, so that during combustion all the fuel is burned up and all the Oxygen is used up, leaving only the carbons to be expelled out the exhaust. I mean, I'm relatively new to understanding all of this, but all of my research and reading tells me this. More O2 will make it rev and burn hot, so look for an air leak from Carb to Cylinder...remember, fire needs three things; ignition (spark), food (fuel) and oxygen (air)...the more air you add, the hotter it gets for a longer period of time....at least in campfires that seems to be the case.

You read it correctly, if you add more oil the the fuel then the amount of fuel becomes less.

So by reducing the amount of fuel, you make the mixture lean!

Whatever oil fuel ratio you run, has no affect on the O2 that enters the cylinder that is controlled by the slide. Take away fuel and now you have a heat producing O2 rich mix (lean on fuel).

A change from 32:1 to 25:1, will nessistate a change to one size bigger main and possibly the needle on a richer setting.

 

[EZRider76]

You read it correctly, if you add more oil the the fuel then the amount of fuel becomes less.

So by reducing the amount of fuel, you make the mixture lean!

Whatever oil fuel ratio you run, has no affect on the O2 that enters the cylinder that is controlled by the slide. Take away fuel and now you have a heat producing O2 rich mix (lean on fuel).

A change from 32:1 to 25:1, will nessistate a change to one size bigger main and possibly the needle on a richer setting.

Ok, I don't know what the hell I was thinking earlier...I mean, I do, but I knew better. So by adding more oil, you are obviously leaning the AFR more toward the air. Totally makes sense, I just wasn't thinking clearly.

 

[slickerthanyou]

Before running it again ill do a leak down. Just seems like this is a more simple problem im not catching.

Its always ran at 40:1 but I did fill it up with 2oz more today and the temp still shot up way too fast.



Overheating started couple days ago. The temp rises much faster than normal and I know this vary's, but its runs up to about 375 degrees within 20min. At 350 the coolant begins to come out the overflow tube.. Should not be doing this.

Compression seems fine :-[

That motor isn't gonna last long reaching 375*. I have never went past 214* air cooled! In the dead of summer. This is checking temp at the head, between the fins.

Well, sounds like (if it has one), the water pump isn't working, rad is clogged with dirt debris, or the cooling passages are clogged. Should never get close to 300 degrees IMO!

 

[Dirty Blaster]

Yea the oil/fuel mix is not the issue here. Im thinking your right, and ill have to diagnose the radiator. This can really be caused by many things

 

[Budget_Blaster]

Should have an electric waterpump with that kit how are you powering it?

Id like to see pics of your install if you dont mind many of us have considered this kit but the benefits vs price have been questionable.

Is the radiator getting hot during these extreme temp rises?Can you hear the pump running?Do the hoses get warm to and from the rad?Ill bet you got issues with the circulation.Also are you bleeding the system of air bubbles if not they can cause hot spots.