450 overheating.

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1/14/2019 1:51 PM
Edited Date/Time: 1/14/2019 1:52 PM

Going to sound like a stupid question, but are 450's more prone to overheating than 250's? I picked up a super clean, low hour - but my first 450 this weekend and when i let it run for about 5 minutes in the garage, it started to drip a bit out of the over flow. My 250 i can start and let run in the garage for what seems like forever and it never overheats...….


1/14/2019 2:07 PM

My 250f heats up quickly, as quick as my sons 450


1/14/2019 3:37 PM

Unless you have a fan blowing air over the radiators while running in your garage , it is not a good idea to let them run so long. Air flow is needed.

Paw Paw


1/14/2019 4:38 PM

Depends what bike you have but most Japanese 450's only come with a 1.1 radiator cap stock. A 1.6 cap won't make the engine run any cooler but it will increase the boiling point to help you not lose coolant. I just bought a 1.6 cap on eBay. You shouldn't let a bike run on the stand with no airflow longer than about 3 minutes.


Don't ever let facts get in the way of a great story

1/14/2019 4:48 PM

5 mins idling is too long. 1 or 2 mins is all you need.