I noted your comment from last year that you used a condenser on a BMW R100S with the old starter that drew more amperage than it was supposed to...
Thanks for answering a 38 year old question for me. A little history...
Back in 1980 I had the first V50 Moto Guzzi to hit the Pacific Northwest. I bought it while attempting to recover from BMW loss. Neat bike but gutless and whetted my appetite to own another Beemer (months before had traded my '76 R90/6 locomotive for a BMW 2002 Coupe, also gutless in comparison to the R90).
I found a basket case, 1970 R75/5 short frame. It had a 830cc kit and lots of problems; broken sidestand, worn centerstand mounts (and no stand), bad paint, tires, wheel bearings, "ground" valve covers, only one bolt holding the transmission to the motor and a worn kickstart idler pin about to drop into the tranny. But what heart it had and what a deal.
I massaged it back to a new life. The former owner of Greenlake BMW rebushed the idler pin. Coast Guard, tin-bender mates custom painted the bits in a black with blue pearl clear coat and built a solo seat from the original pan.. Center stand mounts were rebuilt and a Brown's side stand replaced the 2x4 under the jug I used initially. Heavy duty springs in the forks, oil and gas shocks, deep sump, black chrome exhaust, electronic ignition and Mikuni carbs replaced the silver label Bings. Rear sets from San Jose BMW, Euro bars, black Napoleons, and new Conti's.
And here we come back to your R100 experience. The /5 battery had a very short life span. It always needed a charge. I wanted to lighten the bike some more and I wanted more "see through". So the monstrous starter came out and the air box with it. "Uni's" were used for filters on the Mikuni's and that renewed kickstarter worked like a charm. No more dead battery.
Now, 38 years later, the suspected culprit has been verified. I never knew why the stock starter was such a challenge for the battery. Now I do.
New stablemate! Old (2002) Scorpa SY250 w/Long Ride option. It has seen some abuse but it all works and starts on the 2nd kick! "Yoga on a motorcycle" (J.R.)
2015 Ural cT. She's no longer a virgin.
2005 Moto Guzzi Breva 750
2006 (test bed
) Royal Enfield DIY mechanics course.
Prior: 3 BMW, 2 MG, 3 Yam, 1 Korean scooter and a Bultaco Frontera.