Question about 1982 Honda VF 750 S
Does anyone have any information on how to start troubleshooting how to tune up a Sabre? The manual does not specify how to remove all spark plugs nor how to remove the carbs to clean. We can easily remove the side spark plugs, but am unsure how to reach the front ones. Also, how common is it to have to remove the pulse generators and spark generator units? Thanks much
Man, you have the wrong manual. It is beyond the scope of this site to teach you how to do major work on your bike. Honda manuals are available on the web. Get one.
Posted on May 14, 2014
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Posted on Jan 02, 2017
locate the crankase cover to the left of the engine towards the lower end of the motor. if the bike has a center stand place it upon it t\and undo the crank cover once removed you will visually see the pulse generator it is like a large type style magnet. good luck
live free ride hard..
Posted on Mar 30, 2009
If the spark appears to be weak only for the two front cylinders, then I would suggest checking the electrical connections for the ignition coils.
If the spark for the other two cylinders looks the same (yellow), then I'd suggest checking the compression on the non-functioning cylinders. A compression reading of 140~160PSI is what you're looking for. Low compression indicates internal engine damage - or could be from something relatively simple - like insufficient valve tappet clearance.
If the bike has been sitting for a long period of time, it could be that the carburetors are plugged up with fuel varnish. This can cause some cylinders to not run. A complete carb disassembly and clean-out will be needed.
Posted on Oct 23, 2009
Testimonial: "thanks for that feed back . there is plenty of fuel and compression is non existant on front left and 80 psi on front right,I suspect cam wear????"
SOURCE: no spark on spark plug
To check the ignition coil, unplug the wires going to it and check the resistance with an ohm meter. There are two parts of it to check, the primary and secondary circuits. The primary circuit is the low voltage side where the black and green wires from the harness attach. The resistance through this part of the coil should be between 0.16 and 0.19 ohms. Check the secondary side by measuring the resistance between the spark plug lead and the primary side where the green wire was attached. The resistance there should be between 3.69 and 4.51 ohms.
The resistance through the pulse generator, as measured between the two wires that come from it, should be between 468 and 572 ohms.
Generally, the various components of the ignition system are very trouble free. If you're not getting spark to the spark plug, be sure to check all of the bike's wire harness and connectors for corrosion, melted connectors, broken wires, etc.
Posted on Nov 22, 2009
CLEAN THE CARB AGAIN IF IT RUNS ON STARTING FLUID ITS NOT GETTING FUEL YOU WILL NEED TO REMOVE THE JETS AND MAKE SURE THEY ARE CLEAR
Posted on Jan 29, 2010
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