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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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Which rad cap?
I have a 1.2 bar radiator cap that has seen better days. My 300 was spitting and gurgling in 85* weather today (mild to moderate hill climbs), and I suspect the cap to be dodgy. If I walk into a KTM shop, what part number/model/year will get me a new cap? Also, what pressure (resistance?) is recommended? I understand that 1.8 bar is all of the rage among the orange crowd, is that recommended for our bikes?
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Phil (New bike pending...) |
#2
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All healed up, and ready to burn some fat. |
#3
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I am using a 1.4 bar KTM cap .Seems to be working perfect.
KTM P/N 59035009000
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03 EC300 The pig...04 XR650L 01 380sx |
#4
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Revolutionary.. I would think that it needed ALOT higher pressure to alter the boilingpoint of coolant water?? I thought the higher pressure cap only worked as a safety valve..
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Henrik Schmidt Faster, Faster!! Until the Thrill of Speed, Overcomes the Fear of Death.. Team YamaGas Racing. http://bricksite.com/teamyamagasracing Last edited by HenrikSchmidt; 08-14-2012 at 07:43 AM. |
#5
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My system is in good order, radiators straight(ish) and clear of debris, no problems other than the leaky cap. I have had issues losing water since I bought the bike, this was the first ride where the issues were obviously apparent. I was probably a bit lean, too, which I am sure didn't help. The rubber seal is a bit torn and worn, so I just want to replace the cap to eliminate any other avenues of failure.
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Phil (New bike pending...) |
#6
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Many on this forum prefer to run the 1.4 I've never had an issue with either of our bikes using the oem 1.2 caps and as you see it isn't a dramatic change anyhow. My guess is most that have installed the 1.4 cap would have seen their problems go away by just replacing the old one like for like.
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jeff '00 XC250 (mine) LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion. '04 EC250 (the kids) (he can do his own mods haha!) |
#7
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1.4 bar KTM cap. FWIW, KTM made the rads for the pre '07 bikes. The caps still fit the newer rads.
KTMs tend to boil a lot easier than GGs, likely because they hold less coolant and there is less mass to the motor. I guess thats why those guys like the 1.8 bar cap. |
#8
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look at this graphic. It will help you to have your conclusions.
http://www.endurohp.eng.br/mecanica/...racao/temp.gif Here the pressure is shown with different collors. In the X axis there different ethylene glycol proportions And then in the Y axis the temperatura with the fluid will boil
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www.endurohp.eng.br Sherco ST300 2015 (Trials) https://www.instagram.com/leocm74/ Brasil! |
#9
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I just switched my KTM to the 1.8.. as its the 4stroke.. I've been running a 1.4 on my gg's since my 97 GG.. too easy to boil over with the 1.2 ,, even basic watercooled mowing equipment has a 1.3 cap.. in fact I carry two of these in my tool box to events in case of a cap failure.. I ran a John Deere 1.3 cap on my 03 250ec for almost a year before switching to the 1.4
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Steve 16 Beta 350rr 04 KTM 525 sx/exc gone 03 KTM 625 sxc-rehab unit-did its job and now gone 03 GG 250 ec-gone 97 GG 250 ec Gone |
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