Question about Honda CB 750F2 Seven Fifty Motorcycles

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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.

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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

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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

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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

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