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I decided to tackle a low charging issue on my 78 GS750 today. I upgraded to the SH775 and the 1980+ 18 pole stator and rotor a few years back. I’m still running a conventional lead acid battery. I cleaned up the connections and now I’m getting 14.2 volts at the battery terminals at 5k rpm with the lights on and 14.5 volts with the lights off. I never ride with the headlight off but I’m wondering if I’m getting into battery boilover territory with these figures. Any ideas if this is too much?
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1978 Suzuki GS750
Past bikes owned:
1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster -
Nope, that's about where it should be with that RR at that RPM mate.
To be honest with our climate I'd swap to an AGM asap. In the summer you'll end up topping up the battery monthly in my experience....1980 GS1000G - Sold
1978 GS1000E - Finished!
1980 GS550E - Fixed & given to a friend
1983 GS750ES Special - Sold
2009 KLR 650 - Sold - gone to TX!
1982 GS1100G - Rebuilt and finished. - Sold
2009 TE610 - Dual Sporting around dreaming of Dakar.....
www.parasiticsanalytics.com
TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/ -
Please disregard. I just saw in the stator papers that up to 14.8 volts is good. I don’t think it’s possible for my charging system to get that high.1978 Suzuki GS750
Past bikes owned:
1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF RoadmasterComment
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Awesome! Thanks salty! I think I’ll look into an agm as soon as my financial situation gets better. Any particular ones you recommend?Originally posted by salty_monk View PostNope, that's about where it should be with that RR at that RPM mate.
To be honest with our climate I'd swap to an AGM asap. In the summer you'll end up topping up the battery monthly in my experience....
matt1978 Suzuki GS750
Past bikes owned:
1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF RoadmasterComment
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Motobatt or Deka EX15L are the two I like. The Motobatt I like slightly better. Last a few months longer in my experience & have 2 sets of terminals to connect to. I get about 5 years out of them but you can tell when they are starting to get weak...
1980 GS1000G - Sold
1978 GS1000E - Finished!
1980 GS550E - Fixed & given to a friend
1983 GS750ES Special - Sold
2009 KLR 650 - Sold - gone to TX!
1982 GS1100G - Rebuilt and finished. - Sold
2009 TE610 - Dual Sporting around dreaming of Dakar.....
www.parasiticsanalytics.com
TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/Comment
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AMG batteries are great, but if your regular battery is still good, I'd just run it.Ed
To measure is to know.
Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182
Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846
Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf
KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-ResurrectionComment
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that’s pretty a pretty good life on those. I think I’ll give those a shot once mine is finished. Thank you for the tip!Originally posted by salty_monk View PostMotobatt or Deka EX15L are the two I like. The Motobatt I like slightly better. Last a few months longer in my experience & have 2 sets of terminals to connect to. I get about 5 years out of them but you can tell when they are starting to get weak...
1978 Suzuki GS750
Past bikes owned:
1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF RoadmasterComment
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My lead acid battery is knocking on the door of 2.5 years old and it’s still going strong. I have no idea why this one is still going considering battery replacement has typically been an annual thing for me. At $35 a pop at pep boys I didn’t really think much of it. With pep boys being gone, I think I’ll see how long this battery can go and then make the switch to AGM.Originally posted by Nessism View Post1978 Suzuki GS750
Past bikes owned:
1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF RoadmasterComment
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I had good experiences with Motobatt but unfortunately I had a brand new lemon from them. I know it happens but that to me is just not a good sign...Originally posted by salty_monk View PostMotobatt or Deka EX15L are the two I like. The Motobatt I like slightly better. Last a few months longer in my experience & have 2 sets of terminals to connect to. I get about 5 years out of them but you can tell when they are starting to get weak...John 3:16Originally posted by tkent02Comment
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Yep, the GS and the XJ both use the same size of Motobatt and the one I'm currently running in the GS is a good five years old by now, with no sign of giving up yet.---- Dave
79 GS850N - Might be a trike soon.
80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
92 XJ900F - Fairly Stock, for now.
Only a dog knows why a motorcyclist sticks his head out of a car windowComment
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Practically every battery I saw in the '70's and '80's was a Yuasa, so I went with that for my 11E, and my Sporty came with one. (AGMs, of course.) Toss in a Sears DieHard charger, and 5 years should be no sweat.
Like John Gotti used to say, "I could do a nickel standing on my head."1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red
2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.Comment
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As you say.. it happens. I haven't heard of another lemon but very limited experience (although they are well liked here & on ADVrider. The Deka seems to be more popular on the KLR sites but some using Motobatt there too )Originally posted by GabrielGoes View Post
1980 GS1000G - Sold
1978 GS1000E - Finished!
1980 GS550E - Fixed & given to a friend
1983 GS750ES Special - Sold
2009 KLR 650 - Sold - gone to TX!
1982 GS1100G - Rebuilt and finished. - Sold
2009 TE610 - Dual Sporting around dreaming of Dakar.....
www.parasiticsanalytics.com
TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/Comment
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Another vote for MotobattCowboy Up or Quit. - Run Free Lou and Rest in Peace
1981 GS550T - My First
1981 GS550L - My Eldest Daughter's - Now Sold
2007 GSF1250SA Bandit - My touring bike
Sit tall in the saddle Hold your head up high
Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"Comment
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I know, I really liked those yellow Motobatt's too and their alternative post configurations.. Advance Auto used to sell AGM's called Autocraft that said "Made in Virginia" and I still have one 8 years old that holds a charge a well of course now they no longer offer those... now they are Diehards which I hate cause guess where they are made....Originally posted by salty_monk View Post
As you say.. it happens. I haven't heard of another lemon but very limited experience (although they are well liked here & on ADVrider. The Deka seems to be more popular on the KLR sites but some using Motobatt there too )
For me I either get Shorai Lithiums, or Evercraft by "Johnson Controls" aka walmart lead acid batteries that you fill yourself always seem to get at least 5 years or more out of those things... I have yet to find a solid in-between after Motobatt scared me away with their lemon since that was my other "go to".
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My mates swear by Deka for all their boating needs, and they have a no fuss exchange policy too. I may try them out!!John 3:16Originally posted by tkent02Comment
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Deka & Big Crank batteries are made by East Penn Batteries. https://www.eastpennmanufacturing.com/
This climate is too hot & too dry for the wet ones.... too easy to let them run dry.1980 GS1000G - Sold
1978 GS1000E - Finished!
1980 GS550E - Fixed & given to a friend
1983 GS750ES Special - Sold
2009 KLR 650 - Sold - gone to TX!
1982 GS1100G - Rebuilt and finished. - Sold
2009 TE610 - Dual Sporting around dreaming of Dakar.....
www.parasiticsanalytics.com
TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/Comment
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