Hello, after long years waiting to get a pair of wheels that the engine wouldn't be my legs, I save enough to buy a 1992 K100RS 16V, in Dark Grey color, it's not perfect, but I can ride it and that's the most important.
With time and the help from this forum members surely I will put it in "Tip Top" condition! 

PS: It's funny that my motorcycle has is first registration exactly 23 mouths before I was born, (6/1/1992 and 6/12/1993)

Tip top is a lot of work. Rideable, safe and reliable is a lot easier. Many of us are somewhere in between.

Welkome to the forum.  

Bill

indian036 wrote:Tip top is a lot of work. Rideable, safe and reliable is a lot easier. Many of us are somewhere in between.

Welkome to the forum.  

Bill

Your are exactly right! But right now I think that all the faults are known so I can regularly controlled them (like checking brake fluid twice a week ... x) ).
The battery some times works good, sometimes isn't even enough to start the engine, I've already checked the level, and it was low, so I added some distilled water to get the level right, and yesterday already bought a 12V 8A charger, and today I notice some difference to better! 
Although I keep looking for a new gel battery, I though that replacing the acid could give it another year of life maybe ... anyone has tried that ? (1 acid liter 4,6€)
PS: I only started to riding it like one week ago, because before there was a fuel pump replacement, the fuel pump rubber, the front right indicator plastic, front brake cables, fuel tank leak... the reason why I could buy the bike only saving in 4 university years ...

I'm not an expert, but any time I've tried to do anything with the battery acid, it hasn't been successful. A new battery usually gives a better and quicker result. 
Before you do that, check the charging system. At idle it's often marginal, but at 2000+ rpm a volt meter across the battery should be reading at least 13.5 volts. Higher revs can go up to 14.4V. If you're not getting that, either the battery is totally dead (not likely, from your description) or the charging system has a problem. 

Cheap testing is often better than replacing an expensive part that isn't faulty. 

Bill

indian036 wrote:I'm not an expert, but any time I've tried to do anything with the battery acid, it hasn't been successful. A new battery usually gives a better and quicker result. 
Before you do that, check the charging system. At idle it's often marginal, but at 2000+ rpm a volt meter across the battery should be reading at least 13.5 volts. Higher revs can go up to 14.4V. If you're not getting that, either the battery is totally dead (not likely, from your description) or the charging system has a problem. 

Cheap testing is often better than replacing an expensive part that isn't faulty. 

Bill

Thanks for the hint! I will find my multimeter and then I will check those values! 

Welcome!

Brad-Man wrote:Welcome!

Thanks!

good to have you along Filipe. enjoy the K'.

Welcome to the forum, Felipe.  You'll find the help you need to get your K-bike running well right here.  Plenty of knowledgeable and generous riders with our shared love of these bikes.
I was in your country last month and really liked it!  The roads and highways are well-maintained, and much of the countryside is really pretty.  I found the south to be a bit like central California.  However, Northern Portugal and Galicia was perhaps my favorite part of our vacation. 
I hope to return next year on two wheels.

Hi Filipe wlcome to the forum

Thanks GroverK and RicK G!

brickrider2 I'm glad that you like your visit to Portugal! 
The south of Portugal is indeed a bit desert, but is where (Algarve) most of portuguese people went this three day weekend (10 of June is Day of Portugal, and of course an holiday) to do the ritual of sunbathing, and surely none of them known that was happening there the 12 hours Portimão (endurance motorcycle racing) with a big name in portuguese racing bikers, Miguel Oliveira!
But that's not for me, because I'm finishing my masters thesis!

welcome filipe

give the battery a good 8 hours of charge ....before deciding anything

you may find with a good charge, things may settle out , especially with regular riding, now taking place .

measure and write down the results for later  ...it will come in handy at some time in the future

cheers