Electrical problems 81 750F SS

Posted by Sweedish 750 on Aug 23, 2011; 8:14am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Electrical-problems-81-750F-SS-tp3277357.html

Hello everyone

Just bought my 750 for this season and its been a roller coaster ride so far. Good times riding around in the sun mixed with memories of me trying to start the f**ker in the rain with leg power and pure anger.

So, its an electrical problem you say, and with my limited knowledge I would draw the same conclusion. But I'll give you some background and symptoms.

The bike has been in a non-heated garage for the better part of the last decade. When it was taken out to be sold it was fitted with a new battery and the carburetors were cleaned (that's what the previous owner told me, but we're acquaintances so I believe him). It ran well but after a while it needed pushing instead of using the much more comfortable electrical starter.

In the beginning it was really easy to push the bike to get it to ignite, but this changed later, maybe over the span of 4-5 rides, when it became much harder.

So I tried to charge the battery thinking that it was dead, which it probably was since the head lamp cut out when on low revs cornering. With a full battery it started after many turns with the electrical starter and finally pushing the bike. It only lasts around 2 days with the battery which means that it's not charging properly.  

I've charged the battery again and driven but it's still hard to start, so that's one problem. I've also checked the voltage on the battery which is 12,2 v when turned off, around 12-11,9 when in on mode but not running and 13,3 when running at around 4000 rpm.

It should be around 14 or a bit over, given what I've read so far on different forums, right?

Also I've checked the rotor to see if there's a problem, but it gave me a inconclusive result. It didn't give me a stable reading but varied between 0,1 - 2,0 ohms. I hope I used the correct interval. Don't know what this means since the video I've found only shows a rotor with no impedance. Might this be a problem with the regulator?

I'm looking for tips on what to examine/do next?

Thank you for your input

Semi-Happy 750 rider