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I have a GL1100i with two cyl not firing - #2 and #4. Bike will crank instantly on 1-3, but nothing on the left. Additional fuel sprayed into the plenum just seems to overload the working cylinders while adding nothing to the dead pair.
Compression on both dead cyl is 165+psi.
Carbs were checked and cleaned 2-3 times, even the pressed in pilot jet removed for cleaning. Finally, a set of GL1000 carbs taken off a running bike were installed, when cranked the results were the same: #2 & #4 cold as my bankers' heart.
Timing has been carefully checked - marks line up true as an arrow. Plugs and plug caps on bad cyls were replaced with known good and coil continuity checked. Nothing. CDI boxes were swapped just for fun - results were the same.
As a final check, today I pulled the right (1,3) plug caps and connected plugs to ground and tried to crank bike on just cyl #2/4. My thinking was possibly an exhaust obstruction allowed the cylinders to crank, but immediately shut down. Nothing. When I sprayed additional gas into the intake, I was rewarded with nothing but a backfire in the exhaust and intake.
For an engine to run you need:
- compression
- fire/spark
- timing
- fuel/air
The only thing I have not verified is the position of the timing gear on the crank and camshaft... everything else has been checked. Has anyone a suggestion of something else to verify? Has anyone ever experienced one of these bikes slipping a timing gear on the camshaft or main crank? Sounds impossible but I am at a loss here.
help if you can - thanks!!!
I have a GL1100i with two cyl not firing - #2 and #4. Bike will crank instantly on 1-3, but nothing on the left. Additional fuel sprayed into the plenum just seems to overload the working cylinders while adding nothing to the dead pair.
Compression on both dead cyl is 165+psi.
Carbs were checked and cleaned 2-3 times, even the pressed in pilot jet removed for cleaning. Finally, a set of GL1000 carbs taken off a running bike were installed, when cranked the results were the same: #2 & #4 cold as my bankers' heart.
Timing has been carefully checked - marks line up true as an arrow. Plugs and plug caps on bad cyls were replaced with known good and coil continuity checked. Nothing. CDI boxes were swapped just for fun - results were the same.
As a final check, today I pulled the right (1,3) plug caps and connected plugs to ground and tried to crank bike on just cyl #2/4. My thinking was possibly an exhaust obstruction allowed the cylinders to crank, but immediately shut down. Nothing. When I sprayed additional gas into the intake, I was rewarded with nothing but a backfire in the exhaust and intake.
For an engine to run you need:
- compression
- fire/spark
- timing
- fuel/air
The only thing I have not verified is the position of the timing gear on the crank and camshaft... everything else has been checked. Has anyone a suggestion of something else to verify? Has anyone ever experienced one of these bikes slipping a timing gear on the camshaft or main crank? Sounds impossible but I am at a loss here.
help if you can - thanks!!!
