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#717975 - 12/06/17 11:36 pm A10 Super Rocket need help!  
Joined: Dec 2017
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Kazu Offline
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Kazu  Offline
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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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#717990 - 12/07/17 1:30 am Re: A10 Super Rocket need help! [Re: Kazu]  
Joined: Feb 2012
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razor Online content
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razor  Online Content
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tasmania australia
Are the plug leads the right way round.

#717993 - 12/07/17 2:47 am Re: A10 Super Rocket need help! [Re: razor]  
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Ginge Offline
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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
#717998 - 12/07/17 5:47 am Re: A10 Super Rocket need help! [Re: razor]  
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Boomer Online content
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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
#717999 - 12/07/17 6:21 am Re: A10 Super Rocket need help! [Re: Kazu]  
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Kazu Offline
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Kazu  Offline
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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!

#718023 - 12/07/17 1:36 pm Re: A10 Super Rocket need help! [Re: Kazu]  
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Tridentman Online content
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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

#718172 - 12/08/17 10:40 pm Re: A10 Super Rocket need help! [Re: Kazu]  
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Allan Gill Online sleepy
Allan Gill  Online Sleepy


Joined: May 2013
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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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