QuestionI have a 1988 yamaha fzr 400 and it tends to have an overheating problem. I was planning on either replacing or flushing the radiator. However, I cannot find a radiator for the price I expected, about $100. The only ones are $400+. Why? I want to know where to find a decently priced STOCK radiator, not for racing. Or, would flushing the radiator be about as good and how would I go about doing that? thank you, David.
AnswerHi Dave,
Instead of replacing a radiator that is in good condition, why not verify the cause of the overheating and fix the source of the problem?
Most overheating problems are either air in the cooling system, defective fan switch, defective thermostat, defective thermo sensor, obstructed radiator fins, or incorrect coolant mixture ratio.
Anytime the cooling system is opened to air other than opening the radiator cap or reservoir cap, air enters the system.
The system is designed to be air free. Air in the system causes coolant to boil at lower temperatures (slightly above the boiling temp of plain water).
Purging the system of air requires a tool such as MityVac's AirEvac tool, about $100. Purging the system of air is mandatory.
I recommend that you get a copy of the service manual and learn about testing, repairing, and maintaining your FZR400. The manual will pay for itself with the first repair you perform. It will also pay for itself by preventing costly mistakes.
I return tech information files by email. There was no email with your question as requested and explained in my instructions.
Respectfully,
Mark Shively
