Author Topic: Pantah 500  (Read 1056 times)

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Re: Pantah 500
« Reply #30 on: June 28, 2020, 10:11:36 AM »
Yes,the 80's stying was ugly when new, lol......The cat has no interest in bikes ,people food, litter boxes, or most anything not related to being a cat...
   I find the most challenging thing for the naked frame look is a decent looking and fitting seat and the handlebars. Guzzi style swan neck clips look the part but are expensive. I am not against drilling two holes in the upper yoke for risers for conventional handlebars.... And remounting the gauge panel. I do have a set of fork mounted replica Tommaselli headlight brackets....
I ride junk, some of it actually goes fast

Online Rough Edge racing

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Re: Pantah 500
« Reply #31 on: July 01, 2020, 06:18:46 AM »
  I tried to start the bike again..but it just backfired softly and a few flames from the exhaust....The ignition pick ups on the flywheel are known to be a problem when they get old...They check out at 220 ohms each but the wiring insulation is flaking off...I'll fix the wiring and see what happens....The valve timing is correct, 125 psi compression on both cylinders with the engine cold and sitting for a week. It has to be an ignition issue. New pick ups are available but there's no way of knowing if the ignition contrl boxs are good and the factory service manual  that came with the bike has little info on the ignition...
  So if  new pick up wiring doesn't  do the trick...the bike will be for sale....I don't  want to spend a bunch of money and time on  this bike.....
I ride junk, some of it actually goes fast

Offline cliffrod

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Re: Pantah 500
« Reply #32 on: July 01, 2020, 06:51:38 AM »
Yes,the 80's stying was ugly when new, lol......The cat has no interest in bikes ,people food, litter boxes, or most anything not related to being a cat...
   I find the most challenging thing for the naked frame look is a decent looking and fitting seat and the handlebars. Guzzi style swan neck clips look the part but are expensive. I am not against drilling two holes in the upper yoke for risers for conventional handlebars.... And remounting the gauge panel. I do have a set of fork mounted replica Tommaselli headlight brackets....

I think I have at least one extra Marzocchi top triple tree clamp with mounts for upright bars that need an appropriate home.   plain Ducati stuff, not the sexy $$ goodies..  If you keep the bike and have interest, maybe we can swap notes & measurements
1973 V7 Sport  "Now THAT'S a motorcycle!"-  Master Sculptor Giuliano Cecchinelli
1967 V700 Corsa Record
1964 Ducati 250
eccetera, eccetera...

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Online Rough Edge racing

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Re: Pantah 500
« Reply #33 on: July 01, 2020, 07:34:08 AM »
I think I have at least one extra Marzocchi top triple tree clamp with mounts for upright bars that need an appropriate home.   plain Ducati stuff, not the sexy $$ goodies..  If you keep the bike and have interest, maybe we can swap notes & measurements
  Ok, thanks....
I ride junk, some of it actually goes fast

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Re: Pantah 500
« Reply #33 on: July 01, 2020, 07:34:08 AM »

Online Antietam Classic Cycle

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Re: Pantah 500
« Reply #34 on: July 01, 2020, 08:43:54 AM »
  I tried to start the bike again..but it just backfired softly and a few flames from the exhaust....The ignition pick ups on the flywheel are known to be a problem when they get old...They check out at 220 ohms each but the wiring insulation is flaking off...I'll fix the wiring and see what happens....The valve timing is correct, 125 psi compression on both cylinders with the engine cold and sitting for a week. It has to be an ignition issue. New pick ups are available but there's no way of knowing if the ignition contrl boxs are good and the factory service manual  that came with the bike has little info on the ignition...
  So if  new pick up wiring doesn't  do the trick...the bike will be for sale....I don't  want to spend a bunch of money and time on  this bike.....

The same basic ignition system is used on the V50 and V50 II Guzzis, may be more information in that manual. I'll be fixing the pickup wiring on a '78 V50 later today - even the NOS pickup the customer supplied has the insulation falling off.
Charlie
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Online huub

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Re: Pantah 500
« Reply #35 on: July 01, 2020, 09:29:37 AM »
the two cylinders have ignition systems that are pretty independent, so with a defective pickup it should still start one cylinder ,
having both pickups fail at the same time seems unlikely.
there are a pretty limited amount of faults that would affect both cylinders.

Online Rough Edge racing

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Re: Pantah 500
« Reply #36 on: July 01, 2020, 10:20:38 AM »
the two cylinders have ignition systems that are pretty independent, so with a defective pickup it should still start one cylinder ,
having both pickups fail at the same time seems unlikely.
there are a pretty limited amount of faults that would affect both cylinders.
  Yes, the insulation falling off the wires could have an effect on both pick ups...I measured the resistence with a Fluke digital meter..220 ohms. When I removed the pick ups and cut off the wires, the ohm readings were inconsistant...I grabbed my ancient Simpson analog meter..a steady 220 ohms..his isn't the first time I found problems using a digital VOM on automotive stuff....So..I just ordered high heat oil resistent wire and shrink tubing from McMaster Carr..Be here tomorow..
I ride junk, some of it actually goes fast

Offline dguzzi

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Re: Pantah 500
« Reply #37 on: July 03, 2020, 05:50:14 PM »
If you had to buy a bunch of that wire, i would be interested in some of the leftover.
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Online Rough Edge racing

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Re: Pantah 500
« Reply #38 on: July 03, 2020, 06:24:09 PM »
If you had to buy a bunch of that wire, i would be interested in some of the leftover.
Uh, I only bought 10 feet each of green and red...very little left. The high temperature oil resistent wire and the same spec shrink tubing was about 35 bucks McMaster Carr.
  On MS Ducati forums  several guys have been through the bad insulation and resulting backfiring. A few tips on how to test the system and it all appears in order. I caved in to reality and ordered two new cam drive belts...Should be ready to fire up early next week..
I ride junk, some of it actually goes fast

Online Rough Edge racing

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Re: Pantah 500
« Reply #39 on: Today at 08:28:02 AM »
The same basic ignition system is used on the V50 and V50 II Guzzis, may be more information in that manual. I'll be fixing the pickup wiring on a '78 V50 later today - even the NOS pickup the customer supplied has the insulation falling off.
You may know this,but I found it helpful when replacing wires on pick ups because the are polarity sensitive.
  "  When all is installed, stick some plugs in your plug caps, ground them, power up the ignition and get a thin-bladed screwdriver.

With the ignition turned on, place the screwdriver blade across the magnetic poles of one pick-up and pull it off sharply. You should see a spark at the corresponding plug.

If you see a spark as you APPROACH the pick-up, the polarity is incorrect. In this case, simply swap over pick-up connections. Repeat for other pick-up"
I ride junk, some of it actually goes fast

Online Antietam Classic Cycle

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Re: Pantah 500
« Reply #40 on: Today at 09:55:18 AM »
You may know this,but I found it helpful when replacing wires on pick ups because the are polarity sensitive.
  "  When all is installed, stick some plugs in your plug caps, ground them, power up the ignition and get a thin-bladed screwdriver.

With the ignition turned on, place the screwdriver blade across the magnetic poles of one pick-up and pull it off sharply. You should see a spark at the corresponding plug.

If you see a spark as you APPROACH the pick-up, the polarity is incorrect. In this case, simply swap over pick-up connections. Repeat for other pick-up"

Thanks for that information. I was pondering whether they were polarity sensitive last night as I was attaching the new wires.
Charlie
http://www.AntietamClassicCycle.com
'67 Sears Allstate/Puch SR250
'69 V700
'69 Ambassador
'76 Convert
'77 Morini 3 1/2 Strada

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