Hi
I own an 850 mk 1 (1973) with standard Amals and a Boyer and so far in about 10 years ownership it has generally started and ran well. The other day though it started to misfire at low revs so I supected the battery was on it's way out and the Boyer was defaulting to full advance, this was borne out by kick backs on starting. The motor would only run cleanly over 2k and would backfire badly below that with hard starting as well. Before that it ran really well and nothing else has been changed.
Checked the battery, making about 12.4 volts so put in amother battery that was showing a good 13.4 volts and still the same problem. I have checked the Boyer wiring (as it is an old one) connections to the coils etc and all seems as it should be, so I checked the resistance of each coil (Lucas 6 volt). The right one is around 2.2 Ohms, the left one 1.9, is this likely to be the problem?
If so any thoughts on what would be good replacements? Any advice welcome - thanks
I own an 850 mk 1 (1973) with standard Amals and a Boyer and so far in about 10 years ownership it has generally started and ran well. The other day though it started to misfire at low revs so I supected the battery was on it's way out and the Boyer was defaulting to full advance, this was borne out by kick backs on starting. The motor would only run cleanly over 2k and would backfire badly below that with hard starting as well. Before that it ran really well and nothing else has been changed.
Checked the battery, making about 12.4 volts so put in amother battery that was showing a good 13.4 volts and still the same problem. I have checked the Boyer wiring (as it is an old one) connections to the coils etc and all seems as it should be, so I checked the resistance of each coil (Lucas 6 volt). The right one is around 2.2 Ohms, the left one 1.9, is this likely to be the problem?
If so any thoughts on what would be good replacements? Any advice welcome - thanks