by Thomas Coker » Sat Feb 24, 2007 7:43 pm
Have you checked the seal on your water pump. 450r is notorious for water pump seal leak . Especially pre 06 models. In 06, Honda drilled a whole in the impeller to help reduce unneccessary pressure on the seal.
The second issue could be coolant escaping into the trans through oil seal on water pump. Check trans fluid for traces of coolant and radiator/water pump for traces of oil. You can rebuild the entire water pump for around $100.00 (Gaskets, oil seal, pump seal, impellar, shaft).
Last but not least, check head gasket. If this one is it, your coolant could be blowing out the exhaust.
2004 CRf450R
White Brothers Pro Carbon Exhaust, Pro-Grips, Michelin S12, Works Connections Skid and radiator braces, Fastway Billet Shark Fin, ASV C/5 Levers, Uni Filter, Engine Ice