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How do I time a Bosch MRD 4A302 magneto to F163 engine?

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My roketa 50cc scooter won't turn off. Neither emergency kill switch or the key will stop the engine. Electric start works fine. The kill switch will work at times but just quits randomly and have no way...

There is an open connection from the main wiring to the magneto, the magneto wire must be grounded (to the frame) to stop the engine.
The magneto is usually black and comes from the engine into the frame where the main wiring is located, check all connections carefully.

Jul 24, 2014 | Motorcycles

1 Answer

Hi i would like to know why do i only have fire on one side of my 23 hp kawasaki motor?

Assuming that you have checked the spark plug and confirmed that it has not completely failed, the most common reason is the magneto on that side has failed. (There is a separate magneto for each cylinder).

To replace a magneto, you'll need to look up which part is used on your particular engine. (You will need the brand (Briggs, etc.) and the complete engine model and type numbers from the id tag on the engine).

Then go to an intrernet parts seller and look up your part number. One place you can start at is at PartsTree
Once there, click on the engine icon for your engine and drill down until you find the correct magneto part number.

Replacing the magneto is simple, removing the top engine sheet metal cover involves removing a few bolts, and both magnetos are then readily available.

When installing the new magneto, you first screw it down at the furthest point away from the flywheel. Then rotate the flywheel so that the magnet is aligned with the new magneto.

As part of the new magneto, you will get a thin sheet of cardboard that you hold against the flywheel magnet and loosen the new magneto, allowing it to be pulled again the magnet (with the special cardboard spacer in between).

Use care as the magnet is quite strong and the magneto will be pulled to it with a strong force.

Now firmly tighten the two screws that mount the new magneto and slowly rotate the flywheel to remove the cardboard. Replace the engine top cover and your done.

May 24, 2014 | Scag SFZ52-26BS Freedom Z Zero Turn Rider

1 Answer

Riding mower trying to time engine briggs and stratton? i am down too the magnet and can see the marks on the flywheel what do i set the magnet spacing between the flywheel and magnet at? and how do i

Place a standard file card or postcard between the flywheel and the magneto pickup. Adjust the spacing by loosening the two screws that hold the magneto in place and push the magneto against the postcard while tightening the screws securing the magneto in place. Before making this adjustment ensure that any rust on the surface of the flywheel and the magneto pickup elements has been cleaned off by using 400 grit sandpaper. Once you have completed those steps you should be able to crank the engine and observe a spark at the spark plug gap or between the end of the spark plug wire and the chassis of the engine. If a spark is present you may want to ensure that the split key which maintains the timing and ensures the flywheel remains aligned on the crankshaft has not deformed or split in two. This sometimes happens if the mower hits something that suddenly stops the blade from spinning or abruptly kills the engine.

Jun 04, 2017 | Craftsman Garden

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Have got a joe hunt magneto and i want to put it into my triumph 750 1970 model is there a diagram for this or is there instructions on how to install it

I ran one of those on several 60s-70s Triumphs.....great ignition!

Both plugs fire at the same time so there is no left/right to worry about.

Remove spark plugs and gap .018. Remove timing cover (right hand side of engine) over battery ignition points.
Disconnect and tape (insulate) all battery connected wires. Better yet, unhook battery hot wire from battery terminal.
Hold breaker cam in opposite direction of rotation (advanced position) and rotate engine until the points on #1 cylinder just start to open. Note: Use .0015 feeler gauge.
Remove breaker plate, breaker cam advance mechanism, and dowel pin from internal taper if your model used a dowel pin to position breaker cam and advance mechanism. CAUTION Do Not Rotate Engine. If engine is rotated, reverse rotation until piston is down and the cylinder at least one inch before top center on the compression stroke.
Rotate engine in normal direction of rotation until piston is 5/16 from top center on compression stroke. Install magnetos adaptor plate and adaptor shaft in cam taper. DO NOT TIGHTEN SHAFT. CAUTION 1963 to 1970 Triumph unit construction twins have a different length taper on shaft and internal threads are dissimilar. Suggest checking threads and taper. 1963 to 1970 bolt has BSF 1/4 x 26 threads. 1971 and later bolt had 1/4 x 28 thread. Early shafts are marked with the letter "A". Later shafts are marked with "B".
NOTE: Some applications will require drilling and tapping engine with 1/4 x 20 for better security of magneto mounting adapter. Some customers with severe service report that they heli aced adaptor to cam cover with approximately one inch length bead, top and bottom for security.
Remove Magneto cover. With shaft slightly loose in taper mount Magneto so that points are just starting to open and bolts are approximately in center of slot (for timing adjustment later).
Carefully remove Magneto and tighten center bolt in shaft. Re-install Magneto and time. Install cover and plug wires. Hook up ground wire to a separate kill switch to ground only. DO NOT HOOK ANY BATTERY CURRENT TO MAGNETO.
Point Gap .012 to .015

Aug 02, 2011 | Triumph Bonneville Motorcycles

1 Answer

I need to install a magneto on a 57 xl harley sportster. I need to know the procedure to accomplish this. Thanks.

Been a long time since I've done one of those. Let me brush some cobwebs aside and see if I remember how I did it. The magneto fired Sportster engine was equipped with a mechanical left handlebar ignition advance mechanism. You retarded the timing, got the engine fired, and then advanced the timing using the left handlebar grip that was similar to the throttle. When installing the magneto, make sure you install it with it in it's retarded position which is with the body of the magneto at it's maximum clockwise rotation when viewed from the top of the magneto.

The manneto drive shaft will turn as you drop the unit into the cases. You must turn the drive shaft to a position so that when you drop the magneto into the cam gear case it rotates to a point to where it is just about to open the points. I remove the timing plug of the engine and bring the front cylinder up on Top Dead Center on the compression stroke with the mark in the middle of the hole. Then I'd connect an ohm meter, a "buzz box" or simply use a piece of celophane wrap off a cigarette pack placed between the closed points to give me an indication of exactly when the points began to open. I'd rotate the mag until the points just barely opened with the Front Cylinder TDC mark in the hole. This is setting your initial timing at Top Dead Center on the front cylinder. Once the engine is started, you can set the timing using a timing light to set it the max advance timing to the front cylinder advanced timing mark. With the engine running, advance the timing using the handlebar grip. To adjust the front cylinder timing, connect a timing light to the front cylinder spark plug wire. Shine the light in the hole, loosen the clamp that holds the mag and adjust the magneto position until the front cylinder advanced timing mark is in the hole. Tighten the clamp. When you kill the engine, you turn the handlebar grip back to ****** the magneto. Usually, this results in an initial retarde timing of about 5-7° BTDC.

I hope this helps.


Jul 01, 2011 | Harley Davidson XL 53 C Sportster Custom...

3 Answers

I have a Briggs & Stratton 18.5 HP Twin Cylinder engine that has no spark. How can I check the magneto? And, there is a wire that goes to the magneto. Should there be 12v to that wire? If I replace the...

It all depends on the model of engine. If it is a twin engine doesn't it have two magnetos.Very unusual for both to go bad It will depend on the type of ignition(points or solid state) The wire going to the magneto could be the kill switch (kills when grounded) Disconnect it and see if you get spark. IF so then it is in your safety/ignition circuit. If you replace magneto usually the gap is .008-.012

Aug 18, 2010 | Garden

1 Answer

The coupling between magneto and engine broke, and

1) Check the points (inside the magnetor cover) and clean if needed.
2) It could be 180' out of time.
As you rotate the engine and come up to compression TDC, the magneto should trip or 'click' to start the spark. If that click is on the exhaust stroke, it is out of time.
*Magentos will make a very sharp bright blue spark, so points, condensor, and coil is very important.

Nov 23, 2009 | Electrical Supplies

1 Answer


The MRD-M300 has speaker-level inputs so you can easily use it with any car stereo. Hook it up and hear what good bass can sound like!
  • 150 watts RMS x 1 at 4 ohms
  • 300 watts RMS x 1 at 2 ohms
  • MOSFET power supply and output stage
  • STAR Topology for cleaner sound
  • Bass Engine® features:
    • low-pass digital crossover, 30-200 Hz, 24 dB/octave
    • variable subsonic filter (15-50 Hz in 5 Hz steps)
    • parametric EQ variable from 30-160 Hz
    • Bass Compensator enhances low-end definition
  • top-mounted digital control center with cover
  • time correction 0-10 milliseconds in 0.5ms steps
  • phase correction 0-180° selectable
  • digital readout
  • detachable front cover
  • blue power LED
  • delayed turn-on
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • speaker- and preamp-level inputs
  • gold-plated terminals
  • 8-5/16"W x 2-11/16"H x 11-1/2"D (10"D without front cover)
  • 1-year warranty

May 29, 2009 | Alpine MRD-M300 Car Audio Amplifier

1 Answer

Rear main seal leak in F163 engine

Don't know if there is an updated seal available but if the machine is eating seals that fast you need to carefully check the flex plate that couples the PTO shaft of the engine to the rotor shaft of the generator. If it is bent, cracked, or out of balance you'll eat seals due to vibrating the back end of the crankshaft around.


Oct 08, 2008 | Welding Tools

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