RGS battery capacity

Fast&loud

Fast&loud

New member
Location
Norway
Whats the correct numbers of capasity for the start battery to RGS 1000? My battery slow down very fast when trying to start,my battery is pretty new, 12V 30 Ah and 280 A. Seems to be to weak for the task..
 
30AH! I'd be having a very close look at your cables ... including earth/s. If they are in excellent condition, the starter motor would be my next port of call.
 
32 amp was standard back in the day, they needed a huge battery because they didnt run a regulator, the big battery soaked up any excess charge, not so much of that and converted it to heat. I run a 16-amp Deca, and that starts my bike fine. Definitely look at a Starter Motor rebuild.
 
Check the big cables, they are too long and the negative “earth” is attached at the crankcase breather but I think should be attached on the starter motor bolts. Remake the crimped ends helps.
But the other problem often is the small starter relay, which fails in various ways.
The starter motor will always do better if it has had the dust and oil cleaned out of it, but check the cables and relay first.
 
Stock battery for the RGS was around 27Ah.

A gel battery with 18-20Ah, like those used in most BMW these days, should be more than sufficient to spin up any Lav triple or twin. FWIW, I use HD 20Ah gel batteries meant for Harley-Ds, these are physically not as cumbersome as the BMW format.

As stated before, the problem is most probably a connection issue, if the starter really is OK. Pays to test this first. If the battery (-)ve is attached to the frame, the engine needs to be earthed to the frame with a seperate cable.

piet
 
Fast&loud said:
Whats the correct numbers of capasity for the start battery to RGS 1000? My battery slow down very fast when trying to start,my battery is pretty new, 12V 30 Ah and 280 A. Seems to be to weak for the task..
Click to expand...
The first thing I would do is try another battery; new batteries have been known to fail. Remove the battery from the bike and connect a known good battery via jumper cables. If the problem disappears, it's your battery. A load test of your battery will tell you if it is good or not. Most auto-parts shops will test it for free. Start with the easy/obvious first.
 
"almost new" starter could be the result of a crap refurb, there is a lot of bad service abounding in almost every sector if life, take your money and do the least possible for it.

I am getting lots of this lately, I recently had to get a plumber to one of my rented properties, there was a water leak under a wash basin, he tightened the tap connector, and left, all was good, next he says that the taps are not compatible with the tap connectors and new taps are required.
point#1 he fitted the taps just over a year ago as one of them was drippin. So thats his call then ?
point #2. all threaded stem taps sold in the UK comply with BS1010, all taps connectors 15mm or 22mm supplied in the UK are compatible with BS1010 taps.
point #3. two months after he tightened the connectors, there is still no leak
point #4 he is unaware that pipes in all forms was my trade for 50 years, and I employed between 1 and 22 plumbers/pipefitters/welders as work loads raised and fell.
point #5 not everyone is gullible.
CLEM

ps borrow and substitute someones known good starter,
how far are you from Alta?
 
Fast&loud said:
Starter motor is almoust new but I will trace cables for weakness, thank’s.
Click to expand...
In addition to poor earthing, or a poor starter (unlikely if you've replaced with a new one) The starter motor positive cable's strands, if original or just aged, can deteriorate due to oxidation reducing the ampage it can carry and consequently causing poor performance of the starter motor. It's worth replacing the cables with modern cabling which has tinned strands to prevent oxidation.
 
Last edited:
There are quite a few Laverda owners in Norway, and I’ve generally found them to be both knowledgeable and helpful, with a good network of friends and acquaintances with a wide range of bike maintenance skills. I’m sure if you don’t find a solution soon one them will be able to assist you. Rune Vangen in Elverum would be a good starting point for help and advice.
 
The Answer of 78jotadave was very good in my opinion. I don't know which type of battery you have, but in my experience (even if it was only for the 750SF) was, that the standard lead acid batteries you can buy nowadays, don't seem to withstand the vibration of older motorcycles. I had a Yuasa classic lead acid battery which survived only about 2 days until starting was impossible due to internal damages of the battery caused by exessive vibration. Since I have switched to AGM Batteries and some rubber mats I put around the battery (1cm thick) the batteries do last 4-6 Years. Sure, that also presupposes a good cabeling of starter relais and battery, but that was already written.
 
You must log in or register to reply here.
Back
Top