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A65 wont start #253460
05/13/09 4:51 am
05/13/09 4:51 am
Joined: Jan 2002
Posts: 1,132
hamden, ct.
hacksaw Offline OP
BritBike Forum member
hacksaw  Offline OP
BritBike Forum member
Joined: Jan 2002
Posts: 1,132
hamden, ct.
12volt coils Boyer system.
single carb 1965 rocker motor

this motor is wicked hard to start. it kicks back hard against the bottom of my foot! man it aches still!!

it did start and run really nice for 3 minutes or so. it stalled, and i couldnt atart it again.

i am charging the battery an will try new plugs. oter wisw i fear the worst.

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Re: A65 wont start [Re: hacksaw] #253494
05/13/09 1:46 pm
05/13/09 1:46 pm
Joined: Jul 2001
Posts: 12,320
Central Virginia
Lannis Online content

Life member
Lannis  Online Content

Life member
Joined: Jul 2001
Posts: 12,320
Central Virginia
If we rolled the bike into my shop, here's what I'd do:

1) Up on the stand, pull the plugs, screw compression tester into left plug hole, open throttle wide, kick three or four times. Unscrew, screw into right side, open throttle wide, kick three or four times. If readings are over 120 PSI and within 20 PSI of each other, I'd go on to the ignition. If readings are lower, don't keep kicking. 20 minutes down.

2) Ignition. Static-time the Boyer. Plugs are still out, so rotate the engine to 34 degrees before top dead center. Don't know how you do it on your bike, what mods have been made. Is there a mark on the alternator rotor? Is there a notch in the front of the flywheel? Do you measure the piston position down the spark plug hole? With the engine locked at 34 deg BTDC, line the white spots on the Boyer trigger plate up with the holes; that's close enough to start. 30 minutes down, 50 total.

Load test the battery. Just checking the voltage unloaded won't do it. Turn on the key and check battery voltage. If it's not 12.5 volts, charge it and try again. If it still won't feed 12.5 volts to the Boyer under load, trash it and get another one. 10 minutes down, 60 total.

With good battery voltage on, take one of the Boyer trigger wires loose and tap it against the engine case (spark plugs are still out and grounded to the head). You should get a spark snapping across the plugs each time you tap. 15 minutes down, 75 total.

3) If all this checks out, tickle the carb so you KNOW there's gas in the manifold and kick. You should get at least a few turns of the engine firing just on that priming fuel. If it's STILL kicking back on you, you probably have a duff Boyer. If it turns a couple times and dies, you probably have a blocked pilot jet in the carb.

So in a couple hours, you should have a lot more info about what's going on with the bike ....

Good luck!

Lannis


We're approaching the tipping point ... where those who vote for a living will outnumber those who work for a living .....
Re: A65 wont start [Re: Lannis] #253629
05/14/09 12:54 am
05/14/09 12:54 am
Joined: May 2004
Posts: 3,569
Sydney Australia
B
BSA_WM20 Online content
BritBike Forum member
BSA_WM20  Online Content
BritBike Forum member
B
Joined: May 2004
Posts: 3,569
Sydney Australia
Lannis has the whole hog.
If the bike stalled hard I would have suspected that the timing rotor has slipped a bit.
So verify the timing, sounds like it is way too far advanced.


Bike Beesa
Trevor

Moderated by  Allan Gill, Jon W. Whitley 


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