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A10 Super Rocket need help! #717975
12/06/17 11:36 pm
12/06/17 11:36 pm
Joined: Dec 2017
Posts: 7
San Francisco
K
Kazu Offline OP
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Kazu  Offline OP
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K
Joined: Dec 2017
Posts: 7
San Francisco
After I changed intake and exhaust valve guilds on a cylinder head, it doeson't start. It was running before the operation. The engine has compression and spark, and I cleaned a carburetor. I checked ignition timing is 3/8inch before top dead center. It has strong kick back and back fire but it doesn't start. Please tell me what can I think of why it doesn't start. Thank you!

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Re: A10 Super Rocket need help! [Re: Kazu] #717990
12/07/17 1:30 am
12/07/17 1:30 am
Joined: Feb 2012
Posts: 151
tasmania australia
R
razor Offline
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razor  Offline
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R
Joined: Feb 2012
Posts: 151
tasmania australia
Are the plug leads the right way round.

Re: A10 Super Rocket need help! [Re: razor] #717993
12/07/17 2:47 am
12/07/17 2:47 am
Joined: Feb 2006
Posts: 671
Qld, Aust and Otago,NZ
G
Ginge Offline
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Ginge  Offline
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G
Joined: Feb 2006
Posts: 671
Qld, Aust and Otago,NZ
Strong kickback and backfire indicates it is sparking too early.

Reset timing closer to top dead centre. If it fires and runs then set the timing properly using a strobe or timing disk.


Ginge
Re: A10 Super Rocket need help! [Re: razor] #717998
12/07/17 5:47 am
12/07/17 5:47 am
Joined: Feb 2011
Posts: 3,475
Orygone
Boomer Offline

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Boomer  Offline

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Orygone
Originally Posted by razor
Are the plug leads the right way round.



+1

This won't take much and will eliminate one possibility.


Bill B...


Boomer
Re: A10 Super Rocket need help! [Re: Kazu] #717999
12/07/17 6:21 am
12/07/17 6:21 am
Joined: Dec 2017
Posts: 7
San Francisco
K
Kazu Offline OP
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Kazu  Offline OP
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K
Joined: Dec 2017
Posts: 7
San Francisco
Thank you razor and Boomer! I tried to swich spark plug leads but it became after fire in extoust pipe instead of back fire. I will try to adjust timing, thanks Ginge!

Re: A10 Super Rocket need help! [Re: Kazu] #718023
12/07/17 1:36 pm
12/07/17 1:36 pm
Joined: Feb 2008
Posts: 4,359
New Jersey USA
Tridentman Online content

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Tridentman  Online Content

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Posts: 4,359
New Jersey USA
Do you have manual or automatic advance/retard?
I think the Super Rocket had manual advance as standard but who knows what might have been changed in 50+ years.
You must have the advance/retard mechanism at full advance when timing it.
If manual then the lever must be in the right position.
If automatic then you must wedge the auto mechanism in the fully advanced position using small wooden wedges.\
HTH

Re: A10 Super Rocket need help! [Re: Kazu] #718172
12/08/17 10:40 pm
12/08/17 10:40 pm
Joined: May 2013
Posts: 4,843
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Joined: May 2013
Posts: 4,843
Rotherham - S. Yorkshire
Pushrods are in the correct place are they? If you’ve only done the head then the ignition and cam timing should not have changed... so why alter it?

If the pushrods are going the wrong way round then inlet valve will be open when exhaust is

Alternately, if you did change the timing... did you advance the magneto (assuming your still on manual advance being a Super rocket ( or wedge open the AAU mechanism if auto) when setting the timing to 3/8” btdc. From memory the crank angle is 37° or 38° BTDC for the super rocket. This will be more accurate way of timing.


beerchug

Moderated by  Allan Gill, Jon W. Whitley 


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