Author Topic: Anyone ever had this much trouble starting a bike?  (Read 1770 times)

Offline 427Thunderbolt

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My foot hurts.

What am I missing?  Magneto just came back from total rebuild and updated with the little condenser plate under cap.  Doug's Cycle Barn did it and it looks like he did a really nice job.
Here is what I've done.
Brand new carb....fuel is getting to carb.
New plugs...gap is set to .020
New Plug wires
Points gap is .012 and it opens to that in both spots during a revolution.
I set timing by finding tdc on compression stroke ( valves are closed and I can feel lash ).  Then I backed piston back clockwise opposite direction of engine rotation 3/8 inch and marked my rod that is touching piston face. I ran it down further a ways and then brought it back up to my mark to get any gear lash out. At this point I tightened the auto advance nut with it fully advanced and about  .002 opening on the points.  When I kick it over and over and over and over and over every once in awhile it puffs some weak flames out of the heads. Exhaust is off because its hard to see the points when pipes are on. I was only going to run it for a few seconds then put the pipes on.
Spark plug clamped to the block has spark but I'm not sure if its good or bad since I don't have anything to compare it to.
This is damn frustrating.....

Offline Billybream

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Re: Anyone ever had this much trouble starting a bike?
« Reply #1 on: 29.07. 2016 05:27 »
Try swooping the HT leads over, always happens to me after any timing changes.
If that fails, ensure you give the carb plenty of tickle until the fuel runneth over.
1960 Super Rocket, owned since 1966, back on the road 2012 after being laid up for 29yrs.

Online Triton Thrasher

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Re: Anyone ever had this much trouble starting a bike?
« Reply #2 on: 29.07. 2016 06:39 »
Did you re-check the timing after tightening the nut on the auto advance?


Offline duTch

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Re: Anyone ever had this much trouble starting a bike?
« Reply #3 on: 29.07. 2016 07:39 »

 
Quote
Try swooping the HT leads over, always happens to me after any timing changes. 

 Yep, 'swapping' the leads was my first thought too- friggin' spell-check/ predictive text! Otherwise keep a kickin' *conf*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online mugwump

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Re: Anyone ever had this much trouble starting a bike?
« Reply #4 on: 29.07. 2016 08:48 »
Try reducing the plug gaps to about 15 thou, as you may have a weak spark. If the bike starts then consider a  mag fault.  You haven't said why you replaced the other bits as well as a mag rebuild, or was the re-build just a new condensor. Always worth just replacing/renewing one bit at a time.

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58 Ariel Huntmaster]

Offline Topdad

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Re: Anyone ever had this much trouble starting a bike?
« Reply #5 on: 29.07. 2016 10:07 »
TDC 3/8" try 5/16"  and points 2 thou open try a cigarette paper just releasing maybe the combination of those two plus a large plug gap is the culprit . Unless the plug lead swop sorted it into some sort of life .
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Offline muskrat

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Re: Anyone ever had this much trouble starting a bike?
« Reply #6 on: 29.07. 2016 13:51 »
As TT said, re-check timing after the auto advance nut is tightened. They can, and quite often do, move.
Cheers
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Offline 427Thunderbolt

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Re: Anyone ever had this much trouble starting a bike?
« Reply #7 on: 29.07. 2016 20:45 »
It's alive !    Switch plug wires and it started on the very first kick ....no kidding !   It sounds absolutely great .   
Thanks for the help everyone ! 
Chad

Offline a10gf

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Re: Anyone ever had this much trouble starting a bike?
« Reply #8 on: 29.07. 2016 22:05 »
^^^ Excellent. & winner of the 'Best Easy & Free Fix" Award 2016.

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Offline Kickaha

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Re: Anyone ever had this much trouble starting a bike?
« Reply #9 on: 29.07. 2016 22:34 »
It's alive !    Switch plug wires and it started on the very first kick ....no kidding !   It sounds absolutely great .   
Thanks for the help everyone ! 
Chad

Ha, I had the very same thing when my engine was rebuilt, lots of kicking, cursing and aggravation for a very simple fix
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Online Joolstacho

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Re: Anyone ever had this much trouble starting a bike?
« Reply #10 on: 02.08. 2016 11:42 »
Thank the lord for that, I was getting worried!

Offline Tumbleweed

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Re: Anyone ever had this much trouble starting a bike?
« Reply #11 on: 09.08. 2016 15:11 »
I haven't slept for two nights
Semper in excretia sumus solum profundum veriat.

Offline BrianS

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Re: Anyone ever had this much trouble starting a bike?
« Reply #12 on: 29.01. 2017 22:38 »
Rather than start a new thread, I hope it's OK to post on this one.

I have seen various BTDC timing points mentioned in posts for the A10 Golden Flash.

Sorry if this has been raised before but I have a BSA Service Sheet and a Haynes Manual showing 11/32" but an old  BSA Instruction Manual  showing 13/32".

I doubt in practice I will get anywhere near the accuracy that the difference will cause an issue but thought I would post this for interest's sake! I am going to use the majority measurement of 11/32"  ;)

Brian
1955 BSA A10 Golden Flash
Exeter, Devon, UK

Online Greybeard

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Re: Anyone ever had this much trouble starting a bike?
« Reply #13 on: 20.05. 2017 10:33 »
....Sorry if this has been raised before but I have a BSA Service Sheet and a Haynes Manual showing 11/32" but an old  BSA Instruction Manual  showing 13/32".

A bit late but I came across your post while searching for mag timing. Re: 13/32"; have a look at this page from the A7 A10 Wiki taken from the owners manual: http://www.bsawiki.com/chaps/10-chapter02

Offline a101960

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Re: Anyone ever had this much trouble starting a bike?
« Reply #14 on: 20.05. 2017 17:39 »
I bought one of these a few years back. I always buy the appropriate tool for the job because it simplifies things. http://www.davelindsley.co.uk/magneto-timing-detector.html Far more accurate than cigarette papers. I am not sure about this one offered for sale by Dave Lindsley because it doesn't say, but my one also has a buzzer. I think if I remember correctly I got mine from Magneto Ignition Supplies, but I am not absolutely certain about that. Anyway, it is a great tool and makes a fiddley job so much easier. By the way Greybeard, with modern petrol 3/8 B.T.D.C. might provoke pinking.
John