20 Most Recent
2008 Honda CB 750 Questions & Answers
How do you trouble shoot the starter switch
If you turn the bike on and all the lights are bright the battery should turn over the bike.If you push the starter button and the solenoid clicks the button is good. If you jump the posts on the solenoid and the starter works the solenoid contacts are burnt replace the solenoid ( the starter is good). If you hold the starter button and tap on the starter with a plastic hammer and the starter works, you need starter brushes. If you take the starter apart and don't have continuity (using a voltmeter) between every other contact on armature it is bad replace the starter with new or rebuilt.
Need to split motor
no tricks it is very difficult and very easy to break the cases just take your time with it and work them apart
Very stiff throttle cb750
I've never heard of this being a problem, especially if the bike isn't total junk. Keep us posted on what you find, will you? I'm guessing it's gunk in the carb body itself, not something on the outside, but I'd like to hear where the problem truly lies. If things are that stiff with the throttle, I'd probably double check to make sure the slides move freely...stuff like that.
I'd probably do a good carb cleaning anyhow if it were me. If you're reluctant to do that, at least plan on using some Seafoam for a while to help make sure your passages in the carbs are clear. The bowls being clean is definitely a good thing, but you still need to be concerned about your floats, float needles, and slides being sticky even if everything looks good. Doesn't take much gas to make things gummy.
Just remember that if you aren't familiar with cleaning carbs, carb cleaner and rubber parts DON'T mix well. You need to be sure to follow your manual closely if you do decide to clean your carbs. If you have questions about this, post them before you start...it can really save you headaches later on.
One thing to keep in mind when it comes to older cables is that they sometimes can seem like they're okay when off the bike, you can check them and they'll seem like they move alright, but as soon as you get them put on the bike with the bends everything, they'll bind enough to cause a stiff throttle. Just thought I'd mention that in case things still seem stiff even after you take care of the carb work.
1981 CB750 will not idle without choke
If you need to use choke and there has been a recent clean and/or rebuild. It would be a good idea to check the fuel mixture screw setting. It sounds like it is running a fuel/air mix that is too thin, (lean mixture).
Firing order on cb750 1974 honda
left coil feeds 1 and 4...right coil feeds 2 and 3...as long as you stick to this it doesn't matter which lead goes to which plug. Left coil will have one short lead and one long...short =1...long = 4. Right coil leads will be about even in length...doesn't matter which goes to 2 or 3.
It's a wasted spark system so plugs 1 and 4 fire together...2 and 3 fire together...only 1 cylinder in each pair will be compressed and ready to fire when the spark happens, the other will be empty and coming on to it's inlet stroke...
I have a 1982 CB750
Sorry I thought the bike was a 1975 when in fact it is a 1982. I would suggest you check the points and make sure it is clean and adjusted properly. Regarding the carb, you can make 2 become 1 but if the parts will fit and bear in mind that air mixture will require careful tuning since it will not be the same as manufactured default. Back firing is often caused by faulty spark, plugs, coil or even bad ground to engine.Also before you consider doing any work on the carb, try to swap the points to a new one.(I assume it has a points engine due to the year of manufacture)
Engine backfire
1. Carbs not cleaned correctly
2. airbox not sealed to back of carbs or no air cleaner in it
3. intake manifolds broken or open and leaking air
4. any open vacuum lines will make a backfire
5. a lean condition on the engine
6. possibly valve problems or cam timing
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