backfiring into the carb.

[eric.geiger]

after sitting for 30 years my car is slowly coming back to life.
Mark @ MPH has put in many hours of work and has managed to clear the obstruction in the fuel lines, un seize my carburetor, re-tap the block to mount the cooling fan and re tap the cam housing to mount the carb. He has flushed the tank numerous times and installed 2 fuel filters to catch any left over gunk. The compression is good 150 to 160
he tried starting it today for the first time and it is back firing. He is hoping that it is just whoever tried to install new points on the car right before i purchased it put something together wrong.
the engine has fuel and spark just at the totally wrong time
Praying that the timing chain hasn't slipped or jumped at all. and since the compression is good we know the valves are not bent.
what do you think.

[feltonminicycle]

You can't have high compression and bent valves. Have him check the mechanical and ignition timing but in my experience if it spits out the back of the carb there is a problem with the carb as in revving the car from an idle - a flat spot or pop thru the carb. Usually replacing the orings in the carb will do it.
Miles

--- In
2cylinderhondas@yahoogroups.com
, "eric.geiger" wrote:
> after sitting for 30 years my car is slowly coming back to life.
> Mark @ MPH has put in many hours of work and has managed to clear the obstruction in the fuel lines, un seize my carburetor, re-tap the block to mount the cooling fan and re tap the cam housing to mount the carb. He has flushed the tank numerous times and installed 2 fuel filters to catch any left over gunk. The compression is good 150 to 160
> he tried starting it today for the first time and it is back firing. He is hoping that it is just whoever tried to install new points on the car right before i purchased it put something together wrong.
> the engine has fuel and spark just at the totally wrong time
> Praying that the timing chain hasn't slipped or jumped at all. and since the compression is good we know the valves are not bent.
> what do you think.

[dwb_07]

If the observation is correct and it is "backfiring" thru the carb it means an exhaust valve is open when it should not be. Check your static timing. Retard the spark completely and see what happens. Keep in mind that you don't want to be cranking it over until you are sure the timing chain is good. You might want to be hand cranking it with the valve cover off. That way you can see what is going on.

--- In
2cylinderhondas@yahoogroups.com
, "feltonminicycle" wrote:
> You can't have high compression and bent valves. Have him check the mechanical and ignition timing but in my experience if it spits out the back of the carb there is a problem with the carb as in revving the car from an idle - a flat spot or pop thru the carb. Usually replacing the orings in the carb will do it.
> Miles
> --- In
2cylinderhondas@yahoogroups.com
, "eric.geiger" wrote:
> > after sitting for 30 years my car is slowly coming back to life.
> > Mark @ MPH has put in many hours of work and has managed to clear the obstruction in the fuel lines, un seize my carburetor, re-tap the block to mount the cooling fan and re tap the cam housing to mount the carb. He has flushed the tank numerous times and installed 2 fuel filters to catch any left over gunk. The compression is good 150 to 160
> > he tried starting it today for the first time and it is back firing. He is hoping that it is just whoever tried to install new points on the car right before i purchased it put something together wrong.
> > the engine has fuel and spark just at the totally wrong time
> > Praying that the timing chain hasn't slipped or jumped at all. and since the compression is good we know the valves are not bent.
> > what do you think.

[Eric Geiger]

Thanks.  I've done some extensive research and reading the past 2 days and passed all the shop specs and manual pages on to mark.  hopefully monday he can get it started.
as soon as its running ill be bringing it home to milwaukee
Eric J. Geiger
PRG Nocturne
XXX-XXX-XXXX  phone
XXX-XXX-XXXX  fax
XXX-XXX-XXXX  mobile
egeiger@...
www.prgnocturne.com

On May 6, 2012, at 9:33 AM, dwb_07 wrote:
> If the observation is correct and it is "backfiring" thru the carb it means an exhaust valve is open when it should not be. Check your static timing. Retard the spark completely and see what happens. Keep in mind that you don't want to be cranking it over > until you are sure the timing chain is good. You might want to be hand cranking it with the valve cover off. That way you can see what is going on.
> --- In
> 2cylinderhondas@yahoogroups.com
> , "feltonminicycle" wrote:
> > You can't have high compression and bent valves. Have him check the mechanical and ignition timing but in my experience if it spits out the back of the carb there is a problem with the carb as in revving the car from an idle - a flat spot or pop thru the > carb. Usually replacing the orings in the carb will do it.
> > Miles
> > --- In
> 2cylinderhondas@yahoogroups.com
> , "eric.geiger" wrote:
> > > after sitting for 30 years my car is slowly coming back to life.
> > > Mark @ MPH has put in many hours of work and has managed to clear the obstruction in the fuel lines, un seize my carburetor, re-tap the block to mount the cooling fan and re tap the cam housing to mount the carb. He has flushed the tank numerous times and > installed 2 fuel filters to catch any left over gunk. The compression is good 150 to 160
> > > he tried starting it today for the first time and it is back firing. He is hoping that it is just whoever tried to install new points on the car right before i purchased it put something together wrong.
> > > the engine has fuel and spark just at the totally wrong time
> > > Praying that the timing chain hasn't slipped or jumped at all. and since the compression is good we know the valves are not bent.
> > > what do you think.