anthony28 said:my dad got a 1977 yz400 a week ago and we cleaned the carb and the bike wont kick start. but we start it by putting gas were the spark plug goes the it kicks but thats how we have to start it every time and he doesnet want to go far with the bike incase it dies then we can start it so.. plz help ty
yes but it does not make it start betterkingbrian said:have you adjusted the idle once its running?
thx ill try thtmagneto said:My procedure on my CR500 is to lay it on its side for a few seconds to get some gas into the motor, choke it if it is cold, kick it over slowly a few times and then find the start of the compression stroke. Take up the slack on the kickstart and then give it a healthy kick. If the bike is warm it is not usually necessary to choke or lay the bike on its side.
Check your float level.
originaldirt said:Now to diagnose the real problem.
(1)Remove the left hand engine case cover that covers the mag/dyno.( Usually 4 screws)
(2)Grab the flywheel and attempt to move it up/down, left right, in/out. Anyway but
circular in direction.
(3)If you detect any clicking or motion other than circular, you need new crank bearings
and seals for a minimum. A major rebuild $$$$$$$.
(4)Inspect the area around the flywheel, inside the cover, around the statot plate for
any signs of moisture/wetness. If it is oily, smells like gas, or has what appears to
be sweat drops in that area, the crank seals are shot for sure....se item #3.
*****
Two strokes are basically air pumps that pull in air/fuel on the up-stroke from the carb/inlet to the lower end area of the engine. Then once the mixture from the previous rotation fires above the piston, the downward force of the piston pushes (scavenges) the fuel/air in the lower end thru the transfer ports and reaches the top end just as the piston starts upwards again. So, with bad crank bearings and seals you get no lower end "pressure" at all when the motor is not tuning over continuously, but fuel fed directly to the top end via drops in the plug hole will provide enough fule to make it start. Once running there is residual, but declining lower end pressure developing enough pressure/vacuum to keep it running for a while. Once the seals andbearings are really toast. the motor will develop an air leak and run wide open until it grenades itself. Be forewarned.!!
OriginalDirt
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?