nsr overheating PLEASE HELP

[lee125]

rite i whent out on the road on my nsr for the first time before i will write about it after i was out on it for about 5 mins got to 60 then the temp gauge was almost at red i pulled over straight away and the radiator was cold everywere so i pushed it home took all the fairings off just took the thermostat out fired it up and all the coolent water is circulating BUT when you rev it water like builds up out the expansion chamber and with a bubble on top and when you rev it high it fires it out everywere and i dont know why its doing this cause the headgasket is new the head and barrel were not warped so what else could it be as i want to fix it now and go out again any help will very very much appreciated thanks
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cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years

[motorbikes010]

Check for bubbles in the radiator. Take off the radiator cap and start the bike up. Just idling reving until it reaches half way. This should cause the thermostat to open (First check it opens) and then the water should circulate and you'll see bubbles coming out. top it up and then close the radiator cap. This should stop it shooting out. Remember not to fill the expansion tank too much as the water level rises a little when the bike heats up to normal temp.
All of this info is in the NSR manual which you should consult. Its very helpful.

[lee125]

weird i was revving it quite high before i came in and wrote this question whent out topped radiator up cos of the water splashing out and it seems to have fixed itself hopefully so im going to put it together and go on a short ride and see if its ok
____________________
cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years

[lee125]

thanks for the reply motorbikes010
____________________
cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years

[motorbikes010]

Dont forget if its not fixed itself to get the bubbles out of the radiator. This is a common overheating problem and also incorrect 2 stroke.

[lee125]

put it together went out and its still doing it and im so pissed off now cause its the first day today im aloud on the road and it hasnt run properly yet please help me
____________________
cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years

[lee125]

how do you get the bubble out
____________________
cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years

[lee125]

ive taken the cylender head off and the gasket has been leaking so im skimming the head and that then putting it back together should fix it this time hopefully
____________________
cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years

[motorbikes010]

Read my first reply to get the bubbles out of the radiator. Does the cylinder head look warped? Did you tighen it down properly?
Re-assemble the top end and fill the radiator. Then leave the radiator cap off and start the engine ( You will need to obviously get someone to hold the petrol tank. Let it run and you'll notice when the temp gets to half the thermostat will open which will allow the coolant to circulate and any excess air in the system will come out. Bubbles... When this stops cut the engine, top up the coolant when the level goes down again. put the cap back on and re-assemble and then go for a test run.
I strongly recommend you use castrol TTS 2 stroke and adjust the oil pump slightly on the open side so it uses a little more oil.
whilst you run in.

[lee125]

thanks mate but i have just been out for a ride on it for an hour or so and its fine now thanks for the help though
____________________
cbt passed 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years