rebuilt solex, still backfireing,:( help!

[madera]

volvo aq130d(no timing belt),replaced plugs&wires, set timing(8btdc), adjusted valves, rebuilt pair single throat solex 44's. sync'd carbs, when you hit the throttle hard they back fire, when you push it easily thru no problem, i noticed the accelerator pumps have adjustment on external lever/shaft/spring. what to do? would timing adjustment help?

 

[Bt Doctur]

Re: rebuilt solex, still backfireing, help!

backfiring may be caused by a bad valve, lean mixture, bad accelerator pump,weak fuel pump.

 

[Laddies]

Re: rebuilt solex, still backfireing, help!

Move the accelerator pump linkage to give it a longer stroke for more fuel---Bob-- Is that Madera Co CA

 

[rabidfish]

Re: rebuilt solex, still backfireing, help!

Make sure that the accelerator pump is pumping immediately as the throttle opens.<br /><br />After that go back through valve lash adjustment. <br /><br />You may need a "valve job" to fix a leaking valve. OR... You missed something in the previous work...

 

[Dunaruna]

Re: rebuilt solex, still backfireing, help!

Madera, you haven't mentioned points in any of your threads. A weak spark will also contribute to backfiring. Might be time to go back to basics - points, condenser and check the cap & coil tower for corrosion. <br /><br />Aldo