KIDS, DON'T TRY THIS AT HOME.
"You have been warned"
Before I got my Doc Z Solo Starter
(starting rollers), I had a sure-fire way of eliminating all possible reasons for an engine not starting due to my physical weakness, or some particular bike's penchant for start-up routine particulars:
1. Bike that won't start, but with good battery
and plenty of gas, spark, flow through carbs, etc.
2. Tow vehicle with driver who has demonstrated at least medium intellect.
3. 30' length of sturdy, thin diameter tow rope.
4. Helmet and gloves, and other protective wear as you personally believe is prudent.
5. Nearby open road of at least 1/4 mile of right-of-way space.
I think everyone can see where I'm going with this?
FUEL TAPS ON, carbs tickled
ENRICHER SLIDES LOWERED
Set up the tow vehicle & tow rope, align the bike, wrap the tow rope around the left handlebar, taking care that it can freely slip off when you release it, then place the bitter end (no knots) over the left grip.
Get a firm grip, gather your wits, shift the bike into SECOND gear, and nod to the tow driver to indicate ready to go.
Remember, you will need to be pushing pretty stiffly on the right handlebar to offset the tow forces.
Maybe do a practice take-off to get the feel for it before attempting a start in earnest.
Tow driver only needs to start very slowly, pick up gradually to 10 MPH, and maintain speed; the hard part is all on the rider.
As the tow vehicle takes off, you "walk" the bike to avoid a starting [***].
Once the tow driver reaches 10 MPH, he should signal (with a short honk?).
Drop the clutch and HOLD ON TIGHT. * * * (see bottom of post after reading the following section)
Bike should start straight away. If it doesn't immediately start, feed in a slight twist of throttle.
AS SOON AS BIKE STARTS, release the tow rope by lifting your left palm (don't let go of the grip).
Blip the throttle, gas it, or do whatever the heck you think you ought to do, but keep it lit!
If the bike doesn't start after releasing the clutch and towing it more than a couple hundred feet, IT'S NOT GOING TO START.
Oh, yeah, you did have the key & fuel taps on, right?
If the key & fuel taps were on, and it didn't start, go back to the garage and figure out what went wrong.
My wyfe and I have successfully employed this method several times, with very good results and zero visits to the emergency room.
* * * The other possibility is that, at this point, you totally miscalculated this entire process and are only recently waking up in hospital or picking bits of pebbles out of your kneecaps, elbows and palms. Go back and re-read the FIRST two sentences of this post...