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Magneto stuff - help with R60US
Magneto stuff - help with R60US
good luck
The problem is I haven't had this bike long enough to feel the difference. Besides, running amok means I'm learning about all of the details of the bike.
Magneto stuff - help with R60US
figured out if valves or rings yet?
often when they sit for long periods of time
a valve or two can need un-keying for a dance in the seat with some lapping compound...... very easy job and once you've done it a time or two..... 30 to 45 minutes start to finish
and some I've found the oil settled to the bottom most part of the cylinder has turned to a pleasant glue, easy enough to cut with modern solvents
maybe you just have a valve adjusted tight
but I am going to tell you again
you have excessive resistance in the ignition secondary regardless the culprit responsible for the low compression
low compression will have the exact opposite effect on what's happening with the arcing across the safety gap
so it seems your bike has multiple culprits
tackle them one at a time and get the compression right first
Magneto stuff - help with R60US
figured out if valves or rings yet?
often when they sit for long periods of time
a valve or two can need un-keying for a dance in the seat with some lapping compound...... very easy job and once you've done it a time or two..... 30 to 45 minutes start to finish
and some I've found the oil settled to the bottom most part of the cylinder has turned to a pleasant glue, easy enough to cut with modern solvents
maybe you just have a valve adjusted tight
but I am going to tell you again
you have excessive resistance in the ignition secondary regardless the culprit responsible for the low compression
low compression will have the exact opposite effect on what's happening with the arcing across the safety gap
so it seems your bike has multiple culprits
tackle them one at a time and get the compression right first
The bike did set for awhile before I got it so that's a great tip. The excessive resistance thing seems to be solved with the magnet re-alignment since when I did manage to get the bike running the safety gap was no longer arcing.
BTW - how much PSI should I be getting in each cylinder? I can't find that spec anywhere.
- schrader7032
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- Joined: Fri Oct 27, 2006 3:00 am
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Magneto stuff - help with R60US
Some information on how to test for pressure and some range of numbers here:
http://www.w6rec.com/duane/bmw/compression/index.htm
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Magneto stuff - help with R60US
1) Is there a chance that welding the tip of the magnet shaft changed the magnet?
2) How often should I see sparks jump across the safety gap terminals? Or should I at all?
3) Is the advance collar (not the plate) supposed to move parallel along the magneto magnet shaft as well as rotate with advance?