coolant boiling?

[jrk1985]

HI need some help just back from a run into town 13 miles when i stopped i could hear bubbling so i had a look and found my coolant reserve boiling like a kettle the bike is heating up fast in slow traffic i checked the radiator just 2 days ago for this reason and it was full so thought nothing of it till today when this happened the fans coming on when the temp is half way up what sup with my bike ?

[Jake]

Feb 16, 2011 9:20:26 GMT -5 jrk1985 said:

HI need some help just back from a run into town 13 miles when i stopped i could hear bubbling so i had a look and found my coolant reserve boiling like a kettle the bike is heating up fast in slow traffic i checked the radiator just 2 days ago for this reason and it was full so thought nothing of it till today'(

Have you flushed and changed the radiator
coolant recently?

The coolant should be a fifty-fifty mix of
ethylene glycol (i.e. antifreeze) and water…..
or you can buy it pre-mixed from Wemoto.

If the coolant mixture is correct and there’s enough
in the system then there could be a number of causes
for overheating including faulty radiator cap or thermostat
(see link below):

www.hawkworks.net/manual/5.html#5-1-troubleshooting

wbieniec.kis.p.lodz.pl/moto/ntv/manual/3.pdf

growell.proboards.com/index.cgi?board=engine&action=display&thread=851

[jrk1985]

Hi jake i hadnt changed the coolant sincce i got the bike in nov so god nows how long it was since it was changed not much had been done on it was in a garage for 3/4 year i was told .
So i have taken the thermostat out and tested it in pot of water on hob opened no bother when temp got up then i filled it back up with a 50/50 mix left it running for a half hour temp got up but didnt boil fan came on when the temp hits 50/70 % way up gauge am going to get the cap pressure tested today fingers crossed its that and not the water pump as i dont like the thought of getting in about the pump