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If I'm not mistaken, the crankcase vents (after removing the PODs) should go to a tee piece, the middle of the tee to the top of the airbox.

Have you synced the carbs? Also check that they all spring back to nearly fully closed properly.

Hi all, here's mine. It just featured on 'Return of the cafe racers' https://www.returnofthecaferacers.com/honda-cafe-racer/green-muse-fiorello-galluzzo-cb750f/

Just checked my notes from when I did mine. Target was 0.127mm (0.005") with min/max range of 0.102 - 0.152 (0.004" - 0.006"). So yes, definitely worth proceeding with getting the gaps within tolerance. The fun part, you can try playing musical chairs by rearranging what you have to get as many...

Putting carbs back on can be a pain as you know. A trick that makes it a lot easier is to heat the rubbers with a heat gun. The jet under the rubber plug is the troublesome low speed or idle jet. They are either pressed in or have a slot in the top which can be unscrewed. Putting the guitar...

Cleaning the carbs ultrasonically alone is probably not enough. Fully dismantling is the way to go. The primary and main jets shouldn’t be too much of an issue. The problem is idle jet which if you’re lucky, you’ll have the model where they are removable and easier to clean otherwise the guitar...

Ok, there is a bit going on in this thread, valves, coils, ignition so I'm trying to break it down into smaller chunks otherwise you could be frustratingly chasing your tail. So after sorting out the ignition, I'm assuming you're now getting good spark on #3 and #4? If that's all good, cooler...

Hi there, adjusting the valves is important and can be done yourself with basic tools. It's not hard to do but very fiddly, best bet is to get yourself a manual. There is lots of info online too. Basically you need to check the gaps between the valve shims and camshafts. If gap is within...

Most of those generic ones should work however just check the centre to centre bolt distance against yours if you're not planning to modify the mounting point. I used the below on mine (82 CB750F) which looks very similar to the one you posted except for the bolt spacing distance...

Shame it’s only limited to the USA only. Not sure where all members are from but there is a hell of a lot of cb750 enthusiasts all over the world. In this day and age something like PayPal would work regardless of geographical location.

Although POD's look cool on a custom build, this is the reason I stuck with the original air box as these CV carbs are quite fiddly to get right at the best of times. Often there are a number of other problems contributing like vacuum leaks via the intake boots or throttle shaft seals. Then...

Sounds a bit like either the timing or engine/cam chain. Assuming on the front of the engine you've loosened loosen locknut and back off the bolt while engine is running then retighten to adjust the tension on the timing chain but have you done the adjustment for the other chain? Loosen the 2 x...

Hi there, I feel your pain. I think I dismantled my carbs at least another two times after fully rebuilding them and I did replace the felt throttle shaft seals which don’t seem to be an available replacement part however there is a helpful guy (Aaron) that makes them. Send an email to him at...

Have you checked the battery? Could there be a charging problem that has completely drained the battery?

Check and clean the ground connections ensuring good metal to metal contact. May need to charge the battery as it has likely drained with the testing. 9v under load is too low.

Hi there and welcome. In regards to electrical issues, on the dohc cb750s, the charging system seems to be a common problem. The rotors can fail to produce AC volts particularly when hot and also regulator/rectifier failure where it won’t charge the battery.

That’s exactly where I’ve put mine, just below the coils.

After a good nights sleep and clear mind this morning, I checked the choke cable to ensure it wasn't engaging the choke when choke was not required which was ok but I loosened it off just a touch in case there is a slight tension on the cable when things heat up. Pulled the spark plugs, they...

Hi there, I assume you get +12v on the black wires when the ignition is on? If so, that's a start but to get "power to the coil" the other wires (blue and yellow) supply a ground pulse signal via the spark units which are triggered by the pickup mechanism each time the crank spins (similar to...

Thanks for the info. Carbs off again, slides seem to be moving smoothly and not binding despite the minor scratches on the small diameter section. Anyhow I lightly sanded smooth with 800, 1200, 2000 and they glide silky smooth. Refitted and start up, touched up the carb sync. Idles well but even...

Have you checked the coils are connected to the correct cdi igniter modules?

Before removing the carbs again, I'll double check the aircut covers for leaks. I'll check the slides and observe the drop rate and travel. If it does need sanding, you're referring to the part of the slide that has the notch down the side that inserts into the carb bore and not the thicker bit...

Thanks AMC. Checked idle jets were clean, sprayed the crap out of the passages as per the manual blocking the holes and watching it come out the pilot screw holes. Did this with carb cleaner and compressed air in both directions until happy. Refitted the carbs and noticed an instant improvement...

Thanks AMC, much appreciated. The wire used to clean out the idle jets was around .3mm roughly converts to .013". Leaving the idle speed screw where it was, I pulled the carbs out last night, and yes the hole that is supposed to be nearly covered was clearly exposed so the idle circuits are...

Ok, pulled the coils, checked primary and secondary winding resistance comparing to the old set, checked leads. re terminated the coil ends as I wasn’t happy with the fit into the coils. Double checked earth’s for the coils and spark units. Plugs cleaned and gapped slightly bigger, 0.75mm...

Yes throttles wide open, have done several runs, same results on a cold and warm engine. I'll definitely have to borrow a known good gauge at some point to verify the compression numbers, however right now I'm not too concerned about the number since as all four read the same. Valves leaking is...

Thanks amc. I'll do the carb balance and report back. The carbs were taken completely apart and the aircuts were also bypassed. What can cause the plugs to misfire? Each valve, spring, bucket was certainly kept in separate labelled compartments and I made sure to reassemble them in the same...

Hi all, I've got an 82 CB750 that I picked up over a year ago not running and have been slowly rebuilding and converting to a cafe racer. The project is around 85% complete and have had a few attempts at getting the engine to run properly with not a lot of success. I'll start with a bit of...

Glad it worked. Not sure if carb cleaner is harmful to the the plastic floats if left immersed for a long time but you could try wiping them down with the stuff. I know thinners and acetone is often used to get the varnish out of fuel tanks but again, not sure if they’ll hurt the plastic...

Try using a heat gun to warm up the rubber boots.