Subject: Re: Harpers Electronic Ignition for Loopframes
Author: PEHA-@aol.com
Date: May 6, 2003, 7:31 PM
Post ID: 1712892728
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In a message dated 05/06/2003 4:13:58 PM Pacific Daylight Time, mut-@msn.com
writes:
| The next lobe on the distributer cam open the points to fire the other cylinder and if the point gap is not exactly right the timing suffers for it. |
THEORETICALLY, the manufacturing machinist created these two lobes at exactly
the same ramp rate and lift altitude, and to peak at the proper number of
rotational degrees to match the engine. You only have one set of points
being opened by one plastic or fiber lifting block. Therefore, if you set
the gap and timing properly on one cylinder, it MUST BE exactly the same for
the other cylinder. There are only two reasons for variation. First, the
manufacturing precision was not so accurate and one lobe is off from the
other by degrees or altitude (I've never found such, but then it is an old
Italian factory). Second, something has worn the ramp or peak on one of the
lobes (I can't imagine any likely scenario to do that).
So, you should never have to gap or time the right side cylinder. Everything
is done to the left side cylinder.
If this doesn't sound right for your bike, consider installing another
distributor shaft. I'm sure Mark at Moto Guzzi Classics has a pile of them
for cheap.
Patrick
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<HTML><FONT FACE=arial,helvetica><FONT SIZE=2>In a message dated 05/06/2003 4:13:58 PM Pacific Daylight Time, mut-@msn.com writes:<BR>
<BR>
<BR>
<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">The next lobe on the distributer cam open the points to fire the other cylinder and if the point gap is not exactly right the timing suffers for it.</BLOCKQUOTE><BR>
<BR>
THEORETICALLY, the manufacturing machinist created these two lobes at exactly the same ramp rate and lift altitude, and to peak at the proper number of rotational degrees to match the engine. You only have one set of points being opened by one plastic or fiber lifting block. Therefore, if you set the gap and timing properly on one cylinder, it MUST BE exactly the same for the other cylinder. There are only two reasons for variation. First, the manufacturing precision was not so accurate and one lobe is off from the other by degrees or altitude (I've never found such, but then it is an old Italian factory). Second, something has worn the ramp or peak on one of the lobes (I can't imagine any likely scenario to do that).<BR>
<BR>
So, you should never have to gap or time the right side cylinder. Everything is done to the left side cylinder.<BR>
<BR>
If this doesn't sound right for your bike, consider installing another distributor shaft. I'm sure Mark at Moto Guzzi Classics has a pile of them for cheap.<BR>
<BR>
Patrick</FONT></HTML>
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