Coolant exiting from spark plug hole and between cylinder and engine block
 

I have been struggling with a weak spark issue: http://www.gasgasrider.org/forum/showthread.php?t=25181

Now that I finally have a new stator installed, I noticed that - while using the kick start (no plug installed) - coolant comes out of the spark plug hole as well as between the cylinder and engine block.

Is this a 'fatal' damage? I mean while lacking the tools & know-how, would it make any sense to have the engine repaired?

it will definitely make it hard to start lol

possibly not a difficult fix if it is just base gaskets and head o-rings. but before that make sure that the bolts are actually tight and that the coolant isn't moisture sitting in the crank from a drowning

if it isn't the bolts then when you remove the cylinder to replace gasket try to check that the bottom end bearing hasn't had a chance to rust from moisture in the engine

but you do need to get it fixed, if you loose all coolant (will happen faster as the bike warms and builds pressure in the coolant system) you will really damage your bike

The water outlet from the head (haven't seen late model bikes) is right by the spark plug. That join can be leaky but easy fix.

Like Matt said.

If the bike is physically blowing coolant out the spark plug hole, is it a lot? or just a bit?

I'd be pulling the crank case drain bolt out of the bottom of the engine and seeing if any coolant/water comes out as a matter of priority.

Sounds like it could be the base gasket from your description.

When using the kick-start, coolant actually squirts from the right-hand-side seam between the cylinder and block. Based on its red color, it is definitely coolant and not water. At least the accessible bolt is tight.

Out of the spark plug hole, the quantity is such that while holding the plug on the head to check the spark, my hand becomes wet. So, quite a lot...

When viewing through the oil inspection hole, oil level is unchanged and color is dark and not milky. So I'd guess that the coolant has not seeped through the crankshaft seals.

Anyway, I will have to remove the cylinder. How much (and how) do I have to disassemble the power valve mechanism? That thingy is something I've never ever touched before.... Does it require more than just disengaging the lever coming up from the clutch side casing?

post us a vid or pic, that will help you a long way in determining if this is serious or less

I reckon its the head gasket, if so, removing the cylinder is not necessary...

^The coolant escapes between the cylinder and the block.

What year is it? The old ones are easy as long as you melt the unlock nut with a gas torch or something so it comes off without damaging the triangle like plate on upper. Top pv is easy and should be cleaned with oven cleaner when you have it apart.

Read the forum guides from home page, easy as.

What I find interesting is..

The gasket will need to be blown through both sides to have coolant in the jug, and leaking outside the jug..

There is a crankcase bolt in the bottom of the cases (not the transmission drain). Pull it out and see if you have coolant in the crank case.

Next you'll have to pull the cylinder and check for wear or damage. And measure the base gasket.. Is it one of those 0.1mm ones?

Usually if they leak, it's at the front or rear where the cases meet eachother. I'm wondering why a gasket would fail both internally and externally.