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Old 09-11-2012, 09:43 AM
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sdrcer
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Join Date: Feb 2012
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Default RE: 1994 K&B .21 outboard in 2012 help

I have one. Run a long reach glow plug use a cold plug for 25 percent nitro or more. And a hot or med plug for 20 percent and lower. If you use more than 30 nitro you might want to and add a head shim or two. Higher percent nitro likes less compression to make the engine last and not be so hard to tune.

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As of the fuel and oil coming out of the exhaust were it meets the lower unit it is normal there is no seal were they meet. But check to make sure your bolts that hold the engine to the lower unit are tight.

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Fuel spitting out of the carb doesn’t really mean its rich. Pay attention on how it sounds and how much it smokes you want it to have a little smoke coming out of the exhaust when at wide open throttle if you want the engine to live.

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Prop I am using a Prather 225 seems to b fine on 30 percent fuel. And 30 thou of head shims For 50 percent and have my needle adjustment around 3.5-4 for 25percent and 6-7 for 50 percent fuel.

I would start with 25 percent fuel and try prop P 220 = 1.72 diameter X 2.6 pitch..

A lot of boat engines don’t like to idle like a airplane engine, they usually have different carbs. A lot of the boat carbs don’t have a low speed fuel adjustment that is attached to the carb rotor or barrel whatever you want to call it.

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If it is hard to start try unhooking the fuel lines(supply and exh pressureto tank) and pull the glow plug then turn it over with the starter for about 10 seconds or until there is NO fuel or oil coming out of it.

Put the plug back in and hook up the fuel lines Have the carb opening around 1/8 open from the closed position then turn it over until you see that the fuel is just getting to the carb inlet(watch the bubbles in the line)then stop and hook up the plug power and let the plug get hot around 5 seconds then try starting it. The engine should pop a little or fire up after two or three tries. You may have to play with how much or how little throttle you need some engines like to start at about 1/3 to half throttle mine seems to like it at a 1/8 open.

here are a few web sites for stuff and the K&B web site also

Hope this is of some help…

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Jeff

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Prop charts http://www.funrcboats.com/prop_chart1.htm

Stuff good company fast and fair prices http://zippkits.com/~zippkits/index....8f6eaa38f7700b

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Fuel http://torconitro.com/

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K&B http://www.mecoa.com/kb/index.htm

http://www.mecoa.com/acc/index.htm

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Prop charts http://www.funrcboats.com/prop_chart1.htm

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