TM Racing 2002 300cc 2 stroke MX leaking coolant into crank case/combustion chamber

1

116gusec

Member

Feb 12, 2013

3

0

• Feb 13, 2013

• #1

Hi all
Ive been having a water problem with the above mentioned bike. One day i noticed that my bike was struggling to start. I took the plug out to inspect and saw it had milkyness on it. I then turned it over with the sparkplug removed and water came gushing out of the spark plug hole. since then i have replaced the base gasket and o-rings twice and have been having the same issue.
Any help will be appreciated. Thanks and cheers..

 

RM_guy

Moderator

Damn Yankees

LIFETIME SPONSOR

Nov 21, 2000

7,058

213

North East USA

• Feb 13, 2013

• #2

You may have either a warped or cracked head and/or cylinder that is letting coolant in the combustion chamber.

 

1

116gusec

Member

Feb 12, 2013

3

0

• Feb 14, 2013

• Thread starter
• #3

The first time I did have the head and cylinder checked at a mates engineering workshop and didnt show any signs of that. The only other thing i can think of is the passage from the waterpump through the crank case to the cylinder.

 

A

arnego2

Member

Mar 8, 2008

271

1

• Feb 14, 2013

• #4

The crank case has a passage to the water-pump? Is that a TM design? Or are you guessing?

 

1

116gusec

Member

Feb 12, 2013

3

0

• Feb 14, 2013

• Thread starter
• #5

Not sure if it is only a TM design but I phoned up the dealers in Cape Town South Africa and they indicated that there is a "port" that connects from the water pump through the crank case (under the power valves) and up into the cylinder. I have never split the case yet but am going to soon. I'll keep u posted..

 

A

arnego2

Member

Mar 8, 2008

271

1

• Feb 15, 2013

• #6

That might be but it means your cylinder is trashed basically. There are also water lines running at front side crankcase but when those leak you crankcase would be trashed too.