Kickback

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frankfast
Posts: 231
Joined: Wed May 05, 2010 12:35 pm
Location: New York (upstate)

Kickback

Postby frankfast » Sat May 23, 2020 3:39 pm

Looking for help on starting. Bike is kicking back at the highest point of the kick starter. That's the only time it seems to ignite. I'm getting good spark and I've timed the points plate numerous times. I've also tried multiple positions on the points plate to no avail. Timing the ignition. the points plate is adjusted almost as far as it will go clockwise, about 8 degrees BTDC. I've retarded the timing some and got less kickback but still won't start. I'm suspicious that it's starving for fuel because when pulling the plug it doesn't seem wet. I cleaned all the jets in the carb and they are open. Spraying starter fluid through the carb didn't help either. Still can't tell whether the problem is timing or lack of fuel. Compression is good. Bike hasn't been started in a couple of years. It's a 350 Scrambler with a square slide carb 29mm.

Duccout
Posts: 1285
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Kickback

Postby Duccout » Sat May 23, 2020 4:28 pm

Could the advance retard mechanism be jammed?

Ventodue
Posts: 952
Joined: Mon Mar 08, 2010 3:23 pm
Location: Montpellier, France

Re: Kickback

Postby Ventodue » Sat May 23, 2020 5:05 pm

Hi Frank

Just describe your starting procedure for us, please ....

You do have a valve lifter, I believe?

Ciao

Craig

frankfast
Posts: 231
Joined: Wed May 05, 2010 12:35 pm
Location: New York (upstate)

Re: Kickback

Postby frankfast » Sat May 23, 2020 5:29 pm

Unfortunately, the compression relief is not working due to missing parts. I've checked the enricher on the carb and it is clear. I kick the bike after bringing it up on the compression stroke. That's when I get the kickback. Retarding the timing eliminates that but still won't start. I haven't checked the advance mechanism.

ranton_rambler
Posts: 439
Joined: Sun Jun 04, 2017 11:33 am
Location: Stafford UK

Re: Kickback

Postby ranton_rambler » Sat May 23, 2020 6:21 pm

Does it run with a push/bump start?

frankfast
Posts: 231
Joined: Wed May 05, 2010 12:35 pm
Location: New York (upstate)

Re: Kickback

Postby frankfast » Sat May 23, 2020 6:26 pm

Tried that once but didn't get a good push because i was by myself. Have to try it with some help.

ducwiz
Posts: 604
Joined: Tue May 22, 2012 12:52 pm
Location: near Frankfurt, Germany

Re: Kickback

Postby ducwiz » Sat May 23, 2020 9:24 pm

is it possible you timed the ignition at the wrong TDC point? The rotate the AAU by 180°, and I suppose the bike will run.

Hans

frankfast
Posts: 231
Joined: Wed May 05, 2010 12:35 pm
Location: New York (upstate)

Re: Kickback

Postby frankfast » Sat May 23, 2020 9:49 pm

No, I made sure I was on the compression stroke when I set the timing. After I timed it the first time I thought that may have been the case but I checked it again and it was correct.

Jordan
Posts: 1380
Joined: Fri Dec 24, 2010 11:29 am

Re: Kickback

Postby Jordan » Sat May 23, 2020 11:03 pm

frankfast wrote: I kick the bike after bringing it up on the compression stroke. That's when I get the kickback.


Do you go over top dead centre, before letting the kickstart lever come back to the top for a start attempt?

frankfast
Posts: 231
Joined: Wed May 05, 2010 12:35 pm
Location: New York (upstate)

Re: Kickback

Postby frankfast » Sun May 24, 2020 12:53 am

When the bike kicks back, I'm assuming that it's firing as I've timed it 8 degrees BTDC. After it kicks the kick stater immediately goes down as does the piston on the power stroke.


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