Ec 300 getting hot

C

chrille79

New member
Hi there another question about this.
I have ec 300r 2012 and i have mounted a new piston and also fixed
the squish so its around 1,45mm.
The bike runs fine, but when i run like extreme enduro it goes up to 100 degrees. On normal road it is around 75-80.
I have bigger cooling system, extra intercooler, and a new waterpump steel gear. The spark plug looks good.
I had a B piston before and now i got i C piston, could it be to tight?
I thought that 2 stroke would go cooler then 4 stroke, had the same problem
with my yamaha wr 450 also.
I hade run with this 20 hours now. Thanks for help
 
1.45mm is very hard.
How much is the volume in head now?

Did u measure the cylinder?
C could be too tight if u dont know the play between cylinder and piston.
 
Kevin#90 said:
1.45mm is very hard.
How much is the volume in head now?

Did u measure the cylinder?
C could be too tight if u dont know the play between cylinder and piston.
Click to expand...

oki it is 1,55mm i remember now. I have no clue about the volume,
the head is original.
Maybe i i will try to switch back piston, and add a 0,2mm gasket.
 
I've got the original head... Much smaller squish, just have to make sure you make up for it by removing volume from the expansion chamber. Squish serves to cool the engine, not heat it up...
 
Kevin#90 said:
How did u set ur squish to 1.55mm? With thin base gasket?
Click to expand...

Yes its a thin gasket now.And the head is not shaved. I will try to get a thicker and go over 1,8 mm. and hope it is not
the piston size also, i have run it 30 hours now, with no difference in performance.
 
How is the water pump impeller? There are threads on some of the older impellers melting. Do you have the plastic radiator louvers and are they installed correctly? The aluminum braces with the holes reduce air flow.
Make sure the plastic tank shrouds fit tightly to the radiators and do not have a gaps that will allow air to flow around the radiator instead of through the radiator. If there are gaps you can use foam pieces to fill the gaps.
 
The water pump impeller is an extra upgrade from motocross center.com.
I have changed the squish to 2,0 mm and the bike seems to run a little bit cooler.
Have less bottom and more top now.
I dont know about your normal temp?
 
Is your water pump impellor rubbing on the cover? I shaved it back a bit and noticed it ran cooler

Normally runs at 55 degrees now
 
I dont think so, i had to add two extra gasket 0,5mm or else it would leak..
This problem whas the same before the impellor.
I never had any problem in the winter because cold.
But when it is over 20 celsius its getting hot, when slow tough riding, and motocross rading also.
 
Been riding a little longer today, the temp is still high,its takes up to 15 minutes riding its around 80 c. all time
even if i drive in 50 km/h for a while its will not go under 75c.
I think i will try and remove the thermostat and see.
 
I'm guessing you mean temp sensor, as opposed to a thermostat restricting coolant flow until the bike is Warm?

It is worth getting the piston top lined up with the bottom of thr ports, then getting compression ratio adjusted and squish closed up. Will run cleaner and cooler and much faster.

With regards to heat now. Stupid things like blast the coolant hoses through with a hose, is air actually getting through the radiators?
 
motopsycho87 said:
I'm guessing you mean temp sensor, as opposed to a thermostat restricting coolant flow until the bike is Warm?
Click to expand...

No. The newer bikes have a thermostat. At least my 15 model has it. part 21 in the picture.
picture.php
 
motopsycho87 said:
I'm guessing you mean temp sensor, as opposed to a thermostat restricting coolant flow until the bike is Warm?

It is worth getting the piston top lined up with the bottom of thr ports, then getting compression ratio adjusted and squish closed up. Will run cleaner and cooler and much faster.

With regards to heat now. Stupid things like blast the coolant hoses through with a hose, is air actually getting through the radiators?
Click to expand...

I dont think it is air in the system, i removed the thermostat today, and didnt
notice any colder. i think perfekt temp is 55-70 degrees on a two stroke.
I put some bars leak, in the winter because the radiotor was leaking,maybe some channel in the radiator or something is stop?
didnt have any problems at all in the winter its just now when its 15 c outside.

if the temp is round 90c and i drive in 60-70 km/h it takes up to 2 minutes to go down to 70-75, on the yamaha wr 450 when it was warm just under one minute.
 
Mine runs about, not quite, as hot as yours. I'm to the point where I think the only solution is a sensor and fan setup, or just live with the reduced performance and longevity.
 
Last edited:
Uh oh, so you used something like rad-weld? That really may be the problem, best fix for a radiator is drain - degrease - then apply suitable epoxy resin.

Drain your coolant system and give it a damn good flush!
 
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