Four-Stroke Dirt Bike Starting Procedures on 4Strokes.com
4Strokes.com Tech: Four-Stroke Dirt Bike Starting Procedures
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Yamaha WR250F | Add
General Four-Stroke Starting Procedure
- If the engine is cold, it may help to turn up the idle screw
slightly to aid in warm-up and give the engine a little extra fuel.
- Turn the choke to full on.
- Pull in the compression release lever, if so equipped, and push
the kick-starter through 3 or 4 times. This will prime the engine with fuel.
- Without the compression release lever pulled in, slowly push
the kick-starter around to get the piston to top dead center. You'll know
this when the kick-starter becomes hard to push down (indicating compression
- Allow the kick-starter to return to the top.
- Pull the compression release lever in and push the kick-starter
down just a little (around an inch and a half or two). This gets the piston
just past top dead center.
- Let the compression release lever back out and bring the kick-starter
back up to the top.
- Now push the kick-starter down with as much force as you can
and it should fire up. If it doesn't, wait a few seconds and try the procedure
Honda XR650R Cold Starting Procedure by Ken A. Moore
- Do not twist the throttle, no matter what you think or feel,
or you will flood it.
- Choke full on, ignition off.
- Pull in compression release and kick the engine 4 kicks. This
primes the engine.
- Ignition switch on, choke on. Slowly kick the engine until TDC
(the hard spot), then stop.
- Pull in the compression release and gently push the kick leaver
so the engine is just past TDC, then stop. Release the compression release
- Now give her a nice firm kick of the kick starter. Don't touch
that throttle! She should fire up. If not, go back to #4.
- Move choke to 1/2 position. Don't touch that throttle!
- After about 60 seconds turn off the choke. Don't touch that
- After about 2 minutes and the engine is getting warm, you may
now slowly twist the throttle but go easy until fully warmed up.
For warmer conditions use 1/2 choke for initial startup. For engines
that are already warmed up, go just past TDC and kick with no throttle. Make
sure the air/fuel screw is adjusted correctly and the idle is a little on the
high side for a little easier starting on cold days, then turn it down after
Yamaha WR250F Cold Starting Procedure by 250f canuck
- Turn on the choke.
- Give it 2-3 shots of gas by cracking the throttle wide open.
This causes the accelerator pump to squirt gas into the carburetor bore.
- Then use the kick-starter lever to ease the engine to top dead
center (TDC). This is where it gets a little harder to move.
- Then bring the lever back up to the top of the stroke and jump
on it hard. Make sure you kick all the way through the stroke. If you are
of shorter stature, it helps to have something to stand up on under your left
foot. You will get a bit more leverage this way.
- Shut the choke off after the bike has been running for about
Got a Four-Stroke Starting Procedure? If you have a starting
procedure that you've found works well for a particular make and model four-stroke
dirt bike or ATV, please email it to us
and we'll add it to this page. Don't forget to reference Four-Stroke Starting
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