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YAMAHA VENTURE BATTERY REPLACEMENT
 AND
CM WARNING BYPASS

BY JACK (~CONDOR~) CHALAIS

Because we were experiencing hard starts, erratic cold starts, and low battery voltage after our '83VR sat for a few days, we decided to replace the existing battery, installed by the previous owner, with one of the new AGM (absorbed glass matt) batteries that have recently become available due to new technology.  Having never had any experience with these new maintenance free types, but doing a lot of research we felt that a new ODYSSEY AGM would solve a lot of our hard start problems. 
  
EDIT: We have found another brand AGM that seems to be a bit better than the Odyssey in CCa's, and also has the same footprint as the OEM wet cell.  Therefore some of the info below can be ignored.  The battery is the DEKA.  USA made, and at a much better price.  One vendor BOHANNON has a excellent price, and can be on your doorstep in 2-3 days nationwide.
 

After removing the false tank cover, the battery is located under fuse holder.  Remove the fuse box by unhooking the rubber hold down strap.

With the fuse holder out of the way the top of the battery with the low battery acid sensor.

Locate the white/red striped wire leading to the sensor and cut with a pair of dikes.  Make sure to leave the wire long enough to work with later on.  The sensor might have a different colored wire coming out of it and spliced into the white/red.  In this case it's blue.  We chose to cut the blue wire after the crimp to give us room to play with, but before the crimp will work as well.  However if you cut after the crimp and decide to put in a wet cell battery later on you can unplug the by-pass and plug in another battery sensor.

Undo the battery cables and remove the battery from the box.  Set aside the cable screws from the old battery for later..  This is the time to do a little house cleaning.  We found our box interior coated with white acid corrosion.  We soaked the box interior with a  baking powder/water mix, and then tried to blot up the residue.  No luck.  Had to remove the battery box to get it cleaned up properly. I removed the 2 corroded screws at the bottom, and with a little coaxing got the box out.  If your screws are in bad shape due to the corrosion, replace them with those set aside from the cables.

Once the house cleaning has been accomplished set the new battery in place and hook up the cables.  We found the ODYSSEY, although heavier than the wet cell, had a smaller footprint.  Later we added strips of packing Styrofoam to fill the voids.

After installing the battery, turn the ignition key to the start position.  The CM will go thru it's normal check list if everything is connected properly.  Because the battery sensor has been disconnected the red warning light and battery icon will stay on.  You can continue to operate the bike like this, or take a trip to your local Radio Shack and pick up some 1k and 2.2k ohm resistors.  The RS stock #'s are 271-1321 & 271-1325.  They run a buck for a 5 pack.  They're cheap and the reason to pick up both is, one or the other will work, and if you should happen to pick up the wrong size it would cost more in gas than it costs for another pack of resistors, to run back up to the store.  So go ahead....splurge!

You might also pick up a tube of silver bearing solder while you're at it.

Open the top of the fuse box and locate the accessory fuse.  Remove the fuse.  If your lead is held in by a screw, attach an 8" piece of wire to the terminal using a terminal eye.  In our case they were crimped in and we soldered the end to the existing wire stub.
Clip the ends of the resistor wire down to something manageable to about 1" in length.  Solder the resistor between the lead from the fuse box and the sensor lead.  Don't forget to place a piece of heat shrink tubing long enough to cover the resistor and the lead ends before doing any soldering.  
 Put the fuse back in the accessory, and turn the ignition key on again.  The red light should go out and the CM thinks it has a full battery.  If not, try replacing the resistor with one smaller or larger, as the case may be.
Replace the fuse box top, and in this case we will filled the gaps with paper towels.  Later we replaced the towels with about half inch Styrofoam so it looks like we knew what we were doing.

 

Button everything back up and you should be good to go.

 

We found that with the new battery the scoot started quicker, warmed up without sputtering, coughing and missing, and idled much smoother.  We feel we made the right choice.  Hope this helps.
 

~Condor~


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