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Timing or idling Hopefully

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demonlegs Robert Cacic
San Antonio, TX, USA   USA
Howdy y'all,

Lil Blue's almost running after many neglectful years sitting idle. Spark and fuel checks out and starting timing was set per many forum advisors on here. SU carbs are functional and set to static settings too.

1966 1098.

Starts well on choke. Can allow to warm up then back off choke while not having touched accelerator since start. Moment I rev up and let off the engine decelerates all the way to 0.

While driving feels like it has low power too.

Any ideas? No timing light available... And only one set of hands available too.

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AN5L8016 Avatar
AN5L8016 Mark Haynes
Nederland, Colorado, USA   USA
Teh idle screw may be backed off too far, while its idling on the choke, check your idle screw- bring it up until it raises the idle, then take the choke off, lower idle slowly until it suits the engine. If its not that, check for leaks in your induction system by spraying carb cleaner or (if you're brave) starting fluid at all interfaces. carb cleaner at a leak will depress the idle, starting fluid will raise it. Caution with starting fluid, its flammable! Use it at your own risk and have an extinguisher handy.
Another possibility is that the needles aren't centered in the jets and when you blip the throttle, they are jamming and holding the pistons closed. Do your pistons drop with a 'clunk' and are they easy (relatively) to raise?



'58 Bugeye
'66 'Stang



Edited 1 time(s). Last edit at 2017-09-11 12:22 PM by AN5L8016.

demonlegs Robert Cacic
San Antonio, TX, USA   USA
Thanks! I'll get on it.

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demonlegs Robert Cacic
San Antonio, TX, USA   USA
Pleased to announce there's another drivable Sprite!

Unexpectedly the the carb rebuild did the trick. Can't believe it ran at all with one carb jet/needle stuck and the other jet gummed on the float chamber side. Upon those findings I figured things would resolve. Didn't have to leak check either.

Thanks for the helpful suggestions.

A carb rebuild isn't hard for all who are wondering/following this post. Buy the kit, steel wool, dental tools, and a wire tooth brush. Google SU HS2 disassembly instructions. At worst be ready with a butane torch to bake the float chamber side to unfreeze the bolt holding the chamber to the main.

Clean everything on the way down. 3-1 Oil everything and every gasket on the way up. For $110 they work just as well as the $750 new pair.

AN5L8016 Avatar
AN5L8016 Mark Haynes
Nederland, Colorado, USA   USA
Good to know you solved the problem.
Congratulations, you've graduated to more complex problems, in the meantime, smileys with beer Have a beer and celebrate!



'58 Bugeye
'66 'Stang

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