Post by niallac on Feb 16, 2013 21:08:19 GMT -5
Hi all,
I am the proud (if currently slightly frustrated owner) of a '91 Revere 600-M with 44K on the clock. The bike has had more owners than a feral cat, and some villain has clearly left it standing outside for a number of years going by the moderately advanced corrosion on the frame and engine block.
Running has been poor over the last year, and about a week ago it died on me altogether, the reg/rec (OEM I think) had split lengthways and died. I've since wired in a new one, and while I had the tank etc off, I treated her to two new (pattern) coils, new plug leads, and freed up the very green and seized-solid radiator thermostat with a gas torch (very scientific). I was careful about fitting the coils, applying the tiniest smear of dielectric grease to all connections and using decent Lucas wires and new NGK 5K caps.
Started her up this morning for the first time, took her for a test ride, and all was very well. Pulling from 1500rpm, pulling hard from 3500rpm or so, and nice and even through the range - better than she has ever been. All good for an hour or so, at which point the front cylinder very suddenly stopped firing under light acceleration. I limped home from work this evening and unbolted her cumbersome Powerbronze fairing to reveal the damage, suspecting a burst cylinder head, loose plug, or lost connection to the front coil. Nothing to see externally...
Grounding all four plugs on the head shows a massive difference between front and rear ignition - all four plugs spark, but the rears show a big, juicy, bluish-white flash, while the front two are really toiling to make a feeble, intermittent, purply-blue spark across the gap. There is also a tiny amount of fuel on the front carb piston making me think that the front carb may also be contributing to the fouled plugs.
Could the sub-harness from the headlight to the front coil be at fault? Please don't tell me this is the CDI!
I am the proud (if currently slightly frustrated owner) of a '91 Revere 600-M with 44K on the clock. The bike has had more owners than a feral cat, and some villain has clearly left it standing outside for a number of years going by the moderately advanced corrosion on the frame and engine block.
Running has been poor over the last year, and about a week ago it died on me altogether, the reg/rec (OEM I think) had split lengthways and died. I've since wired in a new one, and while I had the tank etc off, I treated her to two new (pattern) coils, new plug leads, and freed up the very green and seized-solid radiator thermostat with a gas torch (very scientific). I was careful about fitting the coils, applying the tiniest smear of dielectric grease to all connections and using decent Lucas wires and new NGK 5K caps.
Started her up this morning for the first time, took her for a test ride, and all was very well. Pulling from 1500rpm, pulling hard from 3500rpm or so, and nice and even through the range - better than she has ever been. All good for an hour or so, at which point the front cylinder very suddenly stopped firing under light acceleration. I limped home from work this evening and unbolted her cumbersome Powerbronze fairing to reveal the damage, suspecting a burst cylinder head, loose plug, or lost connection to the front coil. Nothing to see externally...
Grounding all four plugs on the head shows a massive difference between front and rear ignition - all four plugs spark, but the rears show a big, juicy, bluish-white flash, while the front two are really toiling to make a feeble, intermittent, purply-blue spark across the gap. There is also a tiny amount of fuel on the front carb piston making me think that the front carb may also be contributing to the fouled plugs.
Could the sub-harness from the headlight to the front coil be at fault? Please don't tell me this is the CDI!
