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Discussion Starter #1
I own a 2001 RC51 and i recently had to replace a few hoses and a thermostat on my bike and since then i have had a lot of swelling on the hose that goes from the back of the Right radiator (as you sit on the bike) it seems to always have air in the cooling system is there a bleeder or something in this system. I have tried cycling the system with the radiator cap lose and off to get the air out but nothing is working so far. I even pulled the water pump cover and cranked the bike to ensure the pump was spinning and it was any advice will be help full thank you in advance.
 

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When I had my cooling system apart to have the left radiator puncture welded, I wondered the same thing. How to properly bleed air out of the system.
The service manual said to fill the cooling system with coolant with the bike on the side stand, then put the cap on.
Then start the engine and rev it several times to circulate coolant and then stop the engine before the engine warms up the coolant, and then open the cap and top off the right radiator. I worked for me.
Did you replace that swelling hose?
 

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Discussion Starter #3
Yes and no I am pretty sure it only swells due to air pressure and age because its always a different hose swelling and breaking i did not notice that is what was going on before because i was like hey broke hose replace no trouble shooting after 3 hoses i started investigating and notice why it was happening so now im trying to remedy the issue and i wanted to figure out how to fix it before re-draining X 4 so i will try your method ensure it solves my problem replace last hose and re-fill correctly
 

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As you said, the hoses swelled before breaking.
I'd try to replace all the hoses if you can. It sounds like age and heat have caught up to them and they are delaminating.
I was inspecting mine this weekend while I have my bike tore apart just to stay on top of it.
 

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intresting.. I noticed over the past feww weeks that my bike was running warmer than I wanted after removing the fan so I loosened the clip and added more coolant to the radiator.. For some reason when I replaced the left side I filled the resivor but didnt think to top off or check the other side.. What do ya know!! Its running a good 30 degrees cooler now. Now Ill be in way less of a hurry to pu tthe fan back on..
 
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