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this 15 hp Kawasaki engine needs lots of gas to run , and taking the choke off and engine speed falters is a sure sign that you have a fuel delivery problem (choke richens fuel mix)
id start with the simple things and move to the more difficult ones
(1) fuel tank - valve on , fuel in tank, hose not broke or crimped
(2) fuel filter replace or clean out fuel filter look for cracks in fuel lines as well
(3) fuel pump - if im not wrong these engines use a vaccume operated fuel pump , these are critical to have good hose for vac supply on (correct type as well)
(4) good working carb - this should have a factory minuki carb , these work very well and don't require a lot of maintence as others might , but they do get stopped up with fouled gas and they do eventually wear out as well requiring rebuilding or replacement , also lots of folks forget that the other part of a working carb is the air , air filters need to be clean enough for sunlite to penetrate thru them ,if you cant see lite thru then air cant get thru either
Try checking these two things: idle adjustment (usually milled screw on the carburettor) or there could be a problem with the governor - this is usually a plate that is driven by the airflow from the cooling fan, check that this moves freely (usually a shaft from the cooling fan on to the carburettor butterfly valve), if this is not free, then the engine will only run on idle, will not reach running speed, garden debris can cause it to jam...
Hi, does it have a fuel shutoff solenoid in the bottom of the carby? if so has it got a rubber tip on it? if so remove the rubber tip and try it as the rubber swells and restricts fuel flow. Also remove all carby jets again and clean down through them using some twisted multi strand wire and carb cleaner and air. Just blowing air through wont remove varnish deposits etc from the walls of the jets. Let me know how you go, regards Phil.
Hi, when you say you cleaned the carb, did you strip it down and blow all the jets out with compressed air? If so, check that you have fuel flowing into the carb. If all this is ok check the valve clearances. Regards Phil.
Is your carby well fixed? If your air intake is too big ,the bike will not run properly .
Make sure the carby is not taking additional air or not enough .
Clean the air filter , tune the carby with the mixing screw air/fuel
Install a new stock spark plug. Clean the air filter then remove and clean the carb. Drain the gas tank, clean out rust and any trash, and remove the fuel valve to clean the internal tank filters. Now install an in-line fuel filter in addition to the tank filter. What follows is just in case it will help out.
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is a proper way to start the engine. Four controls are on your bike to assist
in starting. Below are generic instructions.
The choke, used
when the engine is cold. Pull the red knob for choke.
The " Hot
Start " Lever, used when the engine is hot. Pull the lever to lean
the fuel mix when the engine has been running.
lever, always used.
The throttle, used
to prime the cylinder, (power valve).
kick, instead, push
the kick lever downward. You will feel the back pressure as the piston is going
upward on the compression stroke to the point the pressure is great enough that
the kick lever "locks up". You are very close to TDC. NOW, pull in
the de-compression lever. Push the kick lever a little bit more to get the
piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm,
(Power valve), in the carb gives a shot of gas when this is done. DO NOT
do this multiple times because you will flood the engine. Leave the
throttle closed when kicking. A flooded engine will often
backfire. Now give a strong kick through the full sweep of the kick start
lever. Quickly get your foot off the kick lever at the end of the kick to avoid
any chance of "kickback" from the kick lever. This happens in the
case of a misfire, aka > backfire. It can be very painful, and can even
break a leg. I am serious about that. Repeat the process (but without the
throttle priming), for six kicks. After six kicks go ahead and twist the
throttle again for a second priming. A good battery, a clean spark plug, a
clean carb and clean air filter will also aid in starting. Note that not
all carbs have a power valve. When a power valve is not present you should crack
the throttle open only 1/8 inch from closed on each kick.
check choke for proper connection/check for proper fuel mix / then try to start without air filter-if runs replace w/new filter if problem still check fuel lines for partial blockage/if problem still carb needs service/cleaning
Likely dirt in high speed needle valve(H); could be leaky fuel line(air leaking in), plugged fuel filter, pinched fuel line, etc - anything restricting flow of fuel. Likely, you aggravated an existing problem by cleaning the air filter which would have been providing some choke effect if it were partially plugged.