View Full Version : My engine died help

03-14-2003, 09:27 PM
:mad: :evil: :evil: <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/embarassed.gif ALT=":o"> <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/ohwell.gif ALT=":\"> :mad: :mad: :mad: okay i lended my Aerox to my Grilfriend and telld her if its to hot then she should refil it with water...
well she filled it up after a hole day of riding when it was trowhing smoke and she started it right after it and it just died mow there is water comming from the head and cylinder and from the exhaust port how can i fix it help????:mad: :evil: :( :x :| 0] :mad:

tiba karotsu
03-15-2003, 01:27 AM
i think the cilinder head warped due to overheating that's why there's waterr coming out of the exhaust port, are you sure you bled the air out of the cooling system properly? an air pocket inside the water pump will prevent water from flowing in & out of it.

in my set-up where i use an electric water pump i bleed the air trapped inside the pump housing & in the cilinder itself. if indeed the cilinder head is warped you can take it to a machine shop & have it milled flat, do it also on the cilinder barrel just to be sure or you can now get that new 70cc cilinder kit you wanted all along.

do not put in the thermostat valve as it could be culprit why your scooter overheated, it could've been stuck closed so the hot water inside the cilinder didn't flow out to the radiator.

03-15-2003, 01:51 PM
okay what do you mean by

do not put in the thermostat valve as it could be culprit why your scooter overheated, it could've been stuck closed so the hot water inside the cilinder didn't flow out to the radiator.

And today or tommorow i wil get off the cylinder head and check what happend that only the gasget or the head is damaged also..how can i dtermine if the head is broken??

tiba karotsu
03-15-2003, 09:05 PM
the thermostat valve is bolted inside the water jacket of the cilinder head by 2 screws. just remove the screws and it'll come off. it's located where the big hose connects to the cilinder head.

you can check if your cilinder head is warped by lapping your head on a thick glass using sandpaper as abrasive media. a 220 or 240 grit sandpaper is enough for the job just lap the head very slowly while giving it equal pressure so all of the surface gets done. sprinkle some kerosene first on the sandpaper before you lap it. and do it diagonally.

just do a few strokes and check to see if the surface that faces the cilinder barrel is lapped equally, if it doesn't then it's probably warped.

03-15-2003, 11:29 PM
ok thats the same thing what i just talked with a guy and he also said that i should get off the cylinder and dry out the water from the crank case and then do that what you said with the head amd then put new gasket and sturt it up.

Is it so simple just like that,,do i need to do something else on it or not? oh and he also said sience i have a sports exhaust then i have to Re-jet my carb well i want to do this but first of all my cylinder is pitch black and the piston head also i didnt pull down the cylinder but the head yes should pull off the cylinder or not or does it needs new rings and piston or just rings and a very nice cleaning??
Thanks for helping:D

I hope it will be running next week alredy without spending to much on it...

Oh when i get the for bolts off one of those steel things where you bolt the nuts came out and not the screw so how do i tie it back

Oh and is it simple to pull off the cylinder or not?

And how do i remove that black hose from the cylinder head not those two ones that are nes to the big water hose the one that is on the head??

fk nell
03-16-2003, 04:32 AM
sounds like head gasket m8.

03-16-2003, 10:34 AM
you mean only just head gasket or also the head is broken?

Tiba would you answer?? please as soon a spossible

03-16-2003, 01:41 PM
What's the proper method of bleeding the air out of the cooling system when changing the coolant?

Tiba, do you recommend running without a themostat in place?

03-16-2003, 02:41 PM
Alright i got the Head off the cylinder and the termostat is broken and i have have to change it.

Tiba do i need to drain the water from the cylinder also or not because i found wather in the cylinder when i moved the piston down and there in the holes inside of the cylinder there is water and dirt.

My father says that we should clean it with a high Airpresure cleaner and not take of the cylinder.
And by the way how do i rejet the carb i need to do that so this dosnt hapend again.

03-17-2003, 06:45 AM
is someone answering please help?

03-17-2003, 07:28 AM
Laz does normally run hot ? if so you must find out why it run hot in the first place or it happen again

03-17-2003, 11:40 AM
it runs hot because its very hot here in miami Florida and i have a performance exhaust and the carburator is not rejeted.

tiba karotsu
03-17-2003, 12:26 PM
i think it's lean alright, whatever size you have in there jet it up 2 sizes just to be safe.

03-17-2003, 07:06 PM
Tiba you mean the cylinder head is warped that the sandpaper wonthelp anymore? do i need to take it to a machine shop for get that then i buy the 70cc sport kit.
I hope the head is not warped or the cylinder how can i check on the cylinder if its warped on the barrell

Oh and what is if i dont put back the thermostat will it still work or what those the thermostat do? dont i need that thing there?
My theremostat is ok i think, should it move down if you press it with your finger or not cuz my is not moving down if i press it.

tiba karotsu
03-17-2003, 08:26 PM
when you push open the thermostat doesn't mean it's OK, when it gets hot it the springs should retract so the valve will open. just boil some water and put the thermostat there, if it doesn't open or just barely opens when it's boiling throw it away.

lap the cilinder surface just like what i told you about the cilinder head. just do a few strokes and check if the scratches are level meaning if there are areas that are not covered in scratches that means it's warped.

03-18-2003, 02:20 AM
Tiba is Aerox radiotor smaller than ours ? because mine dont even warm up and i worried it cold seize , even when raced it stays cool to the touch which is strange

so run it without thermostate see what hapens -- i tell you all thermostates put on 2 strokes are wrong heat range--they open too late like about 70 to 80 degres and 2 strokes dont like to run hoter than 55degress or it will lose power and mess up the jetting too so better not to use them --i dont know why they dont out a lighter thermostate on 2 strokes

Dutch Royal T
03-18-2003, 07:29 AM
no hotter than 55 degrees. Ok that is for LC engines. Any idea about AC cilinders. Because I know these run like WAY hot. Of course that is thé problem for AC cilinders, because they loose power sooner.
But here people have measured 100+ degrees at the cilinder head.

tiba karotsu
03-18-2003, 08:11 AM

don't worry it won't cold seize as we had mine road raced just once at a go kart track, it fared pretty well against the Piaggio Zip SP which is the fastest 70cc on the track that day.

that's how efficient AR-80 radiator is, Kawasaki really makes an overkill when it comes to cooling.

03-18-2003, 11:22 AM
Ok so poeople you still didnt answer that do ineed the thermostat or not. Will it work without or not or will it work in the This hot weather here in miami better without thermostat.

03-18-2003, 01:13 PM
with what kind of product do i clean the cylinder and the head?

tiba karotsu
03-18-2003, 07:18 PM
yes run it without the thermostat and gasoline should be fine for a cleaning agent.

03-19-2003, 06:17 PM
ok i went to this place and they wanted to sell two piston rings for 50 dollars thats stupid that cant be that much right?

tiba karotsu
03-19-2003, 07:02 PM
$50!!! for a set of rings!!! that's stupid indeed. i'd rather buy a 70cc kit if OEM pistons & rings cost that much.

Dutch Royal T
03-19-2003, 08:31 PM
Here we pay €25 for an Evo piston ring.

03-19-2003, 10:35 PM
well it maybe because it was original minerally rings and the aftermarked but i have to change my old ones because they are craked and are woren.
I dont know where to get it for a good price.

03-20-2003, 01:49 PM
I was looking this topperformance 70cc throphy kit and its pretty good in price what do you know about it is it very strong? i mean in not falling apart?

03-20-2003, 05:03 PM
Ace ,too much coolant (green liqued stuff)cause it to run hot so run %90 water and only %10 coolant -- you need some coolant to lube the water pump but too much coolant make it run hot --we are not allowed to use coolant for racing because if leaks its like oil on the track

Dutch , you can call Kart shops , they use a special heat sencor for AC which help them to jet it and they know what temp is best for a AC