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beta evo fan


mike1983
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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.

 

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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.

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