Question about 1993 Honda CB 750 Nighthawk

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1983 Honda Cb650 dohc turns over but won't start, there is spark, fuel and compression

I just rebuilt the engine and now when I push the starter it just keeps whinding but not firing, I tested spark, compression and fuel and there all good, could this be the relay.

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  • Honda Master
  • 8,404 Answers

Check your cam timing.

Posted on Dec 03, 2012

  • Daniel Phillips Dec 05, 2012

    Cheers I checked the timing and it was out by miles. Not only that but I was Checking compression and dropped a nozzle down in the chamber so the head has to come off again.

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: honda pal 2 stroke scooter

Are you adding oil to the gas? (32/1 = 4 ounces per gallon)
Do you still have spark? Install a new stock spark plug.
Clean the carb, but follow these steps >

Remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Let the bike warm up then set the idle speed. This process should get you back on the road.

Posted on Mar 31, 2009

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SOURCE: 05 honda shadow vlx 600 won"t start

Recommendation is to sell it 'as is'. You may well spend the $325.00 on it and it still not run, requiring still more $. Tell the buyer what the mechanic said and knock that amount off the asking price.

While I trust what the mechanic says, I hear you loud and clear concerning the expense. Cut the expense at the $325.00 point and sell the motorcycle.

That, my friend is my suggestion.

Posted on Dec 18, 2009

  • 86 Answers

SOURCE: Honda V45 magna won't turn over

if the starter is jammed, you can probably get it up on the center stand put it in top gear and **** the rear wheel back and fourth. that may do it. or jumping the starter itself may do it.

Posted on May 28, 2009

  • 1 Answer

SOURCE: 1983 honda GL1100I, New spark plugs, good

When I recently ordered parts from Saber Cycle, they included a piece of information that pertained to my motorcycle, which is also a 1983 Honda Goldwing GL1100 Interstate. Here is what it says, I hope this helps:

Air Cut-Off Valve

The air cut-off valve is an extremely important part of the fuel/air intake system that is frequently missed even my competent mechanics, most of whom are not even aware of its existence or how it functions.

Every GL1000 has one, located in the air intake tube, between the air cleaner box and the manifold. Every GL1100 has four, located in the top air intake passage of each carburetor, and every GL1200 has one located in the plenum box below the air cleaner box similar to the GL1000.

These valves are "air blockers", along with the carburetor o-rings, serving to restrict air flow and increase the fuel/air mixture ratio when the carb slides are in the lower RPM range, up to closed so that the machine will start and idle smoothly with virtually no choking and accelerate rapidly, with no stumble or hesitation.

When typical starting requires heavy and prolonged choking to keep the bike running, when stalling and hesitation occurs even while "warmed up" and when backfiring pops while the throttle is shut off while cruising, most people will start fooling with the air screws to try to overcome the problem, only making it worse along with reducing their gas mileage.

Running with dysfunctional air cut-off valves can causes severe engine damage or failure. When the valves are dysfunctional, the engine pulls nearly total air in the low RPM range through the carbs and on to the combustion chamber. The fuel/air ratio is extremely poor with pre-ignition long before the normal 38 to 40 degree firing point, generating an enormous amount of heat, with no power, which is trapped a longer period of time in the cylinder before the exhaust valve opens.

This heat goes mostly up through the cylinder head, gradually incinerating the head gaskets and allowing engine coolant (anti-freeze) to seep into the engine. You can easily spot when you are in trouble by a puff of bluish-white or white smoke on first starting the engine. Don't leave it alone. Change head gaskets immediately or you could take out your bottom end bearings, ruining the engine.

For those of you installing new exhaust systems, you will discolor your headpipes, either blue (lean state) or gold (rich state). You can destain your pipes using "blueaway" or "blue-off" but be careful not to rub the chrome, just dab gently.k These compounds are usually purchased at a Harley dealer or Harley oriented aftermarket shop.

Honda genuine pipes, like many Yamaha pipes, have a double wall for a portion of the headpipe which masks this discoloration-but also masks a bad state of tune. Even if your pipes are original and still in good shape, don't think that you are OK if the bike has any or all of the dysfunctional air cut-off valve running and performance characteristics.

If your 1975 to 1987 Gold Wing is not getting 50-58 miles per gallon (20-23 KM/Liter), you have one of the most obvious signs of trouble. It is likely your air screws have been backed out to try overcome the effects of the poor running, stumbling, starting and stalling and quitting.

Resynchronize all four carbs to the #3 carb vacuum level using mercury carb sticks or vacuum dial gauges. Stay with strict use of the setting levels in either the Honda, Clymer or Haynes manuals. Do not attempt to tune any other way! Guessing will not work and can cause considerable engine damage!!!

Posted on Sep 26, 2009

  • 90 Answers

SOURCE: Honda Varadero 125. Not starting.

Hi !
First check if the current is coming from ignition coil....
If YES ... then the spark plug is burnt(shorted) Get new plugs.
If NO... then there could be a problem with the ignition coil itself Or the coil in the dynamo is burnt.... Regards
Berry


Posted on Feb 23, 2010

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Check for power on the small wire at the starter with the key in the crank position. If there is no power than you will need to trace the circuit. A Year, make, model, and engine size would help a lot!!

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Starter engages but wont turn engine over starters been rebuilt still doing same thing


sounds like,yes, Might try pulling the spark plugs and try it then,
if the intake gasket leaked or even fuel leaked into a cyl. when
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Engine won't fire. Starter turns over, but, won't run


Hi Anonymous, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
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1 Answer

Turns over but won't fire


If a starter is able to crank the engine but it won't start you usually have either an electrical or fuel problem. It's also remotely possibly that it's compression.If an engine has proper fuel, spark and compression, it will start when you crank it. So your challange is to find out which part isn't working right. Start with fuel. Spray a little starting fluid into the air intake while someone tries to start the engine. If it starts briefly when you're spraying starting fluid, you probably have a fuel delivery problem. That could be injectors, fuel pump, fuel filter, relay, fuse... who knows what until you check into it.If it doesn't start with starting fluid, check the spark. Pull a plug wire and attach it to a spare sparkplug and set the plug on a solid metal part of the engine. Have a helper crank the engine while you watch the plug. If you have a good spark, it might just be out of timing.In any case, you'll need to start isolating the problem. Find out which part isn't working then you'll know what to replace/repair.

Jun 25, 2012 | Cars & Trucks

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1985 cbx 750 starter spins but won't start


Make sure you have fuel, compression and spark. If you have all of those check the timing.

Apr 23, 2012 | 1985 Honda CBX 750 F

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Was riding bike and was stopped at a red light when it made a loud noise and died, now it won't start. The engine cranks and turns over but won't start.


You didn't say what year and model the bike was but on any four stroke engine, you must have three things for the engine to run. You need fuel, spark, and compression. The easy one to check is the fuel. Take your air filter off and make sure you're getting fuel to the engine. Then, check your spark. Pull the spark plug wires off the spark plugs in the head and insert another set of plugs in the wires. Ground the plugs against the engine, turn the ignition switch on and press the start button. Watch the plugs to see if you have spark. The next test is compression. With the engine cold, remove the spark plugs. If you have a compression gauge, connect it to one of the heads and spin the engine over with the starter. If you don't have a gauge, simply put your finger over the spark plug hole. Turn the throttle wide open and press the start button. You should show about a hundred pounds of compression if you have a gauge or the compression should blow your finger off the hole with a good deal of force if you're checking it that way. If you have all three of these and they're timed correctly, the engine should run. If the engine won't run, find out which of the three elements is missing and work from there.

Good Luck
Steve

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