mike1983 Posted September 9, 2017 Share Posted September 9, 2017 hi i've just bought a 2011 beta evo 250 after start up the fan comes on soon after and seems to run all the time is this normal? had a couple of good ride outs and the plug seems black and oily and advice on this?? thanks Quote Link to comment Share on other sites More sharing options...
dan williams Posted September 9, 2017 Share Posted September 9, 2017 The two seem at odds. Sounds like two issues that are unrelated. Things we need to know assuming this is a two stroke, How does the bike run? Pinging or knocking on run up under load? Smoky and bogging? What plug do you have? Have you tried a fresh plug? Black oily plug is usually jetting, oil mixture, incorrect plug, blocked exhaust, crank seal/case leak allowing gear oil into crankcase. What are you using for premix oil and ratio? Typically I run 100:1 Bel-Ray H1R. Most guys run between 80:1 > 100:1. Depends on how you ride. Fast trail riding is much different than plonking through sections. Is your coolant topped off? Best to use a propylene glycol mixture like Silkolene Pro-Cool or Engine Ice. NO TAP WATER!!! Only use deionized water. Have you checked your water pump housing/rotor? Betas tend to corrode the pump housing and the plastic rotor gets easily stripped. Jitsie makes a larger metal water pump kit. Highly recommended. 1 Quote Link to comment Share on other sites More sharing options...
mike1983 Posted September 9, 2017 Author Share Posted September 9, 2017 i've just got the bike it's a 2 stroke tried a fresh plug BR7 ES the bike seems to run really well no pinging or knocking or bogging i'm going to drain and flush coolant and will invest in the jitsie water pump housing kit Quote Link to comment Share on other sites More sharing options...
dadof2 Posted September 9, 2017 Share Posted September 9, 2017 If your fan is stuck on it could be overcooling the engine causing the inside to be black and oily. Many find a hotter plug like a BP5ES better for gentle riding. Is your air filter dirty / clogged. The 2011 may come jetted to run at 25;1 fuel to oil mix. If this is the case and you are running less oil this means it will run rich until you change jetting to suit less oil. Check the float height. Quote Link to comment Share on other sites More sharing options...
dan williams Posted September 10, 2017 Share Posted September 10, 2017 25:1?! Might as well be a diesel. Quote Link to comment Share on other sites More sharing options...
mike1983 Posted September 10, 2017 Author Share Posted September 10, 2017 does anyone no what the standard jet numbers are? Quote Link to comment Share on other sites More sharing options...
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