Question about Honda CB 750F2 Seven Fifty Motorcycles

1 Answer

Hello. I have a 1979 honda cb-750F I looks like I am not getting a spark out of the coils. Tried the screwdriver in the boot and set close to a nut trick. Just to check I have a new battery, cleaned the plugs, switched the starter solenoid, opened the dump on 2 of the gas bowls to see gas flow. And checked the 30 amp fuse on the solenoid and changed the 4 fuses under the top cover. Is there a nother fuse inside the headlight cluster. It ran early last year and is kept inside. Any clue to check next would be a great help.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 2,418 Answers

Yes, you need to check the points and condenser. If you have no spark an the plug this is the first part to check. The points have a cam follower (see picture point D), this follower rides an a shaft (E) that should have flat and hi spots to open / close the points. This picture is of a single point system, but will show what parts are what. The plate moves a very small amount (C), which changes the point gap, (which also will change timing) it is not easy to see how much effect there is until it is running and you adjust the points and using a timing light. Be sure the pints contacts are clean, if the condenser and points are old you may want to replace them. Rotate the engine until your points are at max opening. Adjust the points to the desired setting, Check a manual for the gap or start with .015 feeler gage. Secure the plate and all wiring. Test for voltage with the key switch on, using a 12vdc test light, the clamp end of the light grounded to the engine block. Touch the tip to the points top contact (B) it should be hot 12 volts DC, all the way back to the Negative side of the coil (A). Now as you turn the engine slowly, the points will close and the tip will touch and the light will go out, keep turning and the light will come back on. Look for your timing marks, thru the timing window there in the point plate. Turn the engine until the light comes on, adjust the plate to move the timing to align the timing with the light just coming on. This will get you in the ball park to start her up and adjust the timing with a timing light. Hope this helps Fix Ya up.

Hello. I have a 1979 - mcneb_1.gif

Posted on May 22, 2011


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do i fix a no fire on a honda cb 100?

Take a close look at the shaft where the lobe is, is there play in the shaft? High mile bikes the bushing or shaft can wear down and not open the points correctly. You did a good job troubleshooting so far.

Jul 04, 2015 | 1971 Honda CB 100

1 Answer

How do i test the stater and coil on 1979 honda mr50 dirt bike

Have you replaced the condensor? Do the points actually spark?
Have you checked HT lead and plug cap? Remove cap and place bare end of ht lead on cylinder head so that spark can jump from core to cylinder fin, DON'T hold it there... Kick engine over and look for spark at end of HT lead

Jun 06, 2015 | Honda Motorcycles

1 Answer

How to test the coil for spark

The proper way is with a spark tester. A backyard mechanic way is to put a screwdriver in the spark plug boot and hold it close to the engine block, pull the starter rope and look for a spark from the screwdriver to the block. Doesn't always work right and may not tell you for sure it isn't working

Jan 11, 2013 | Garden

1 Answer

1979 Honda GL 1000 (K3) no spark

Hi, Alan and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Faulty run/off switch
11. Tilt sensor needs a reset.
12. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1978 GL1000 No Spark
How to diagnose no spark situation on motorcycle
Honda GL 1000 Shop Manual
Honda GL1000 Owner Manual

Dec 25, 2017 | 1979 Honda GL 1000 (K3)

1 Answer

F250 03 misfire diagnosis

The engine Family you have is know for having coils go bad. If you can get the truck scanned to see which cylinders are misfiring. If not, First I would remove all coils and spark plugs and Inspect. If you have found bad Spark plugs Replace with a high Quality plug. Double Platinum at a Minimum. I would not use Champion plugs. I have never had good luck with them in Fords. Look closely at the coil to spark plug boot. if you see any signs of arcing , White looking or burn marks that is a sign that you have boots letting Ignition spark arc to ground before reaching the spark plug. You can get replacement boots Aprox 4.00 each or there is a complete set. Look closely at the coil pack for any signs of cracking, arching, white residue, burning. that would be a sign of a bad coil pack.

Jan 19, 2012 | Ford F-250 Cars & Trucks

2 Answers

My 91 honda accord is not getting fire to the spark plugs

Check you ignition coil. Pull off the single wire and hold a screwdriver tip about 1/4" away from the place it plugs into. Have someone crank the engine and look for spark from the coil to the screwdriver. Do not hold on to the metal part of the screwdriver. It may shock you if it is working.electricdime.jpg.

Dec 03, 2010 | 1991 Honda Accord

1 Answer

How do I tighten the chain on a 1979 Honda CB 400 Hawk?

loosen rear axle bolt and nut, tighten chain tensioner at rear axle,use the nut on the tension bolt to lock it down to the same calibrated distance(about 3/4 inch chain slack movement up and down not a total of 1 1/2) when the axle alignment is the same on left and right tighten the axle nut and bolt,lube the chain. Make sure you adjust the rear brake tension to make up for the wheel being moved toward the rear.

Apr 25, 2010 | 1977 Honda Cb 400 F

1 Answer

No spark

if you cleaned and set the gap on your points check and make sure the you are getting power up to the points follow the path with your test light.
Power at points?
NO= follow the path to what every is not letting the power pass, fuse, broken wire ect..
YES = power out to coil?
NO=something is wrong with points may not be closed spin motor slowly stil nothing check that they are closing
YES = dose your test light flash when you spin the motor with test on the power wire at coil
NO= points are not opening adj and try agine
YES= change cond. and check for spark
Good Luck
C.C. Motorsports

Feb 01, 2010 | 1979 Yamaha XS 650 F

1 Answer

Put new ignition coil on, however still no spark

Im sorry you are having this trouble with your CB 100. I had a CB 100 from '71.

So you have power going to the coil? How are your points and condenser. I think your trouble is probably your condenser complicated by points that are not properly set. Set the points to .035.

Check these things and try again.

FYI, there is a Honda Riders Club sponsored by Honda and free to browse. If you pay a few bucks and joinn the club, you will get immediate access to service manuals for your model, according to information posted at the site.

Thank you for posting your question at

Nov 08, 2009 | 1976 Honda CB 100

1 Answer

1979 honda cbx 6 cylinder, no power at 1 coil. no

If you mean no output power, coil is bad. If you mean no input power 12v, there is a fault in the wiring. If you mean no signal from stator, wiring problem as well

Jun 15, 2009 | 1979 Honda CBX

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

31 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4825 Answers


Level 3 Expert

79186 Answers


Level 2 Expert

342 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides