Question about 2006 Derbi Senda R 125 4T

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Revometer/headlights not working

New battery/ checked wires, told possibly magneto, is this serious?

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I dont think its magnito if other lights are working an easy way is to by pass wires to lights and rev with test wire as wires could be dead

Posted on Jan 22, 2009

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1 Answer

Wont start battery good


If the starter turns, but there is no battery power reaching the headlights and no battery power reaching the ignition system there is a fault in some part of the electrical system used by both headlights and the ignition system, but not the starter motor. Check all the fuses, if any are bad or dirty replace them then try again, then check the new fuses to see if they have 'blown' if they have you have a serious short-circuit in the wiring or other electrical component, replace the fuses again and remove all the headlight and tail bulbs and try again.

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Is there a hot wire that goes to the armature on a 18.5 2 cly b&s engine


did you replace the armature or the magneto?the magneto has the plug wires on it the armature charges the battery if you put on a new magneto annd you have no spark check the safety switches

Apr 12, 2012 | Garden

1 Answer

I have a 82 gs550l if i charge the battery and then ride it the battery wont stay charged and when the headlight is on it drains the battery even faster


You have either a rectifier or charging coil(magneto) issue. The rectifier changes the AC pulse from the magneto to 12V DC. If that checks out, you'll need to test the magneto. Either case you'll need to have a multimeter handy and access to the factory repair manual for the testing parameters and wiring diagrams. Good luck!

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Chain saw died, no spark. replaced the magneto, still have no spark. gaped it with a .010 brass feeler gauge. disconnected the grounding wires. could it be possible to have 2 bad magnetos. Repalcement part...


Hi, gap should be 8 thou. Try this with a new plug. Check the magnets on the flywheel. It is possible to have a faulty new magneto but not that likely. Also check that the sparkplug terminal is contacting through the high tension lead correctly. Regards Phil.

May 16, 2011 | Ryobi Factory Reconditioned 18" 40cc...

1 Answer

Batt. not ataying charged


Check output of battery when bike is idling.
If still 11 volt, then your charger, which is the magneto is faulty or the wire is broken from it to your battery. If the charge varies when you test when engine dead to engine idling, wire is fine. Should be 13 to 13.5 volt when idling if magneto is ok.

J

Jun 09, 2010 | 2005 Suzuki Boulevard C90

1 Answer

I was mowing today and as I passed a tree the spark plug wire got yanked off the plug by a branch. I reconnected, but now it won't start. Have pushed down hard to make sure cap is seated on plug, but...


I would check out the wire. Sounds like it got yanked hard enough to put some serious pull on it. Start at the end that plugs on the spark plug and work your way to the magneto. Look for any obvious damage. I sure hope not, but I had a similar thing happen once and it costs me a new magneto. Hope this helped and best wishes.

Jul 31, 2009 | Garden

1 Answer

No spark I put new spark plug and gaped new


check the small wire coming out the magneto maybe it is grounding out somewhere, disconnect it from trhe magneto and then see if you have spark

May 16, 2009 | Cub Cadet Street Sign- tractor lawn riding...

1 Answer

Battery wont stay charged


Ok this is probably one of two things either you have a bad earth on the bike causing a poor re charge rate or your alternator / magneto has gone up the spout ?.
If it is a bad earth you will probably be getting other symptons as well for insatnce rear bulbs blowing or headlight bulbs blowing ..horn or starter ( if fitted ) works intermittently you get the picture . check around the bike to all points where the loom attaches to the frame or the engine ( usually black wire bolted to earth ..= frame ) remove and check wires then clean the area it was attached to with a bit of sand paper / emery cloth and refit especially the one from the battery Minus side Black ?. that will go straight to frame somewhere . If it stays the same after you do this you need to check the output of the magneto . with the bike running place a multimeter on the battery terminals voltages should be any where between 12.volts to 13.5 or higher check specs in manuel if not then Magneto / dynamo / alternator faulty finaly if all else fails ( and this was left till last as you said it was new check the ph of the battery ie sometimes new battries should be full of acid but are not .. just water I have had a few .. especially if they are the none maintanance type . .. hope this helps Regards vortash

May 11, 2009 | 2006 Derbi Senda R 125 4T

1 Answer

Can you point me to the wiring diagram for the above mower


The flywheel black (negative) and red (positive) wires are the magneto output. Red goes to ignition to charge the battery, and also burn the headlights -- so the red will go to the headlight switch as well, maybe through the ignition.

There should be an in-line fuse on the charging/headlight wire coming from the magneto.

There should be a safety switch under the seat which energizes the fuel cutoff solenoid on the bottom of the carburetor.

There are also interlock switches on blade engage mechanism, and the brake pedal, These prevent engine from starting if brake is not applied or if blades are engaged -- these would control current to the ignition module.

This is not complete, but it'll give you some clues -- good luck -- it's a ton of work.

May 08, 2009 | Mtd Garden

1 Answer

Where and wot is electronic magneto


Sounds like the stator coil. If your bike has headlights and fancy stuff like that, it has 2 different stator coils behind your magneto or some call it the rotor. sounds like the one that works your lights isnt working right. You can check it with a simple volt merer but you need to know how many omes it should be putting out

Jan 22, 2009 | 2006 Derbi Senda R 125 4T

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