Member Contributer Skids Posted April 9, 2022 Member Contributer Share Posted April 9, 2022 What are folk using for coolant on their 5th Gens in the UK? The good old (Haynes) book says 50% distilled water, 50% corrosion inhibited ethylene glycol but I can't find this combination anywhere. Link to comment Share on other sites More sharing options...
trmoyer Posted April 9, 2022 Share Posted April 9, 2022 Pre-mix 50/50 with no silicates. Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted April 9, 2022 Member Contributer Share Posted April 9, 2022 Myself and others use the Honda automotive coolant with good success. The dye is a slightly different shade of green than the powersports version, but it's otherwise the same. Sold in the US by the gallon, it's far more economical than the powersports counterpart. Link to comment Share on other sites More sharing options...
Member Contributer Skids Posted April 9, 2022 Author Member Contributer Share Posted April 9, 2022 That's all great guys, but I'm in the UK. I'll try Honda but I imagine it's quite expensive compared to some branded solutions. I don't need a guide, I need an available brand on the UK. Thanks for your replies though. Link to comment Share on other sites More sharing options...
Member Contributer Bren Posted April 9, 2022 Member Contributer Share Posted April 9, 2022 39 minutes ago, Skids said: That's all great guys, but I'm in the UK. I'll try Honda but I imagine it's quite expensive compared to some branded solutions. I don't need a guide, I need an available brand on the UK. Thanks for your replies though. I've used Castrol motorbike coolant for the last 20 years in mine and not had any problems. FWIW. Link to comment Share on other sites More sharing options...
Member Contributer Skids Posted April 9, 2022 Author Member Contributer Share Posted April 9, 2022 50 minutes ago, Bren said: I've used Castrol motorbike coolant for the last 20 years in mine and not had any problems. FWIW. Link to comment Share on other sites More sharing options...
Member Contributer stuartb3502 Posted April 10, 2022 Member Contributer Share Posted April 10, 2022 You can get the Honda coolant (type 2) from the car dealers also if that’s easier. Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted April 10, 2022 Member Contributer Share Posted April 10, 2022 Any coolant suitable for alloy engines will do. Unless you expose your bike to sub -10 C temps, you can use 75% distilled water & 25% antifreeze. This helps the cooling too 👍 Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted April 10, 2022 Member Contributer Share Posted April 10, 2022 IIRC reducing the ratio of ethylene glycol reduces the boiling point a bit, but the water replacing that volume has a higher specific heat index so can carry away more heat so boiling, even at a lower temp is much less likely. I've been running that ratio in my bikes, working fine. If you start with premix 50/50, to get the 75/25 ratio, add 1/2 the total system volume of premix, that will provide 1/4 each of the water / glycol system totals (.5 × .5 of each). Then fill the remaining half of the system volume with demineralized water to bring the water portion to .25 + .5 = .75. If unsure of system totals, measure the mix separately in a container and add as needed. Link to comment Share on other sites More sharing options...
Member Contributer bmart Posted April 10, 2022 Member Contributer Share Posted April 10, 2022 There are a lot of charts available for freezin/cooling/overheating related to ratio of water to glycol. I suggest that you have a look w/Mrs. Google helping. Link to comment Share on other sites More sharing options...
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