Recent content by Pwnypower

i should have specified, the starter is going. Did a compression test, and am using a starterfluid. Should be very strange that it suddenly does not start again. I do suspect a weak spark as i need to hold my sparkplug quite a bit away from the bike to get a good spark. How can this be so of a...

I just started my CB again. Rectifier/regulator was toast. Changed it out along with the battery and had a great ride. now i am in the process of changing the front tire, took it out and suddenly the bike does not start again. The spark is there although you need to have it a couple of inches...

i think i found a problem. The charging is not commecing. When idle the battery is 12,6V and staying there.I found this link: https://www.cb750c.com/publicdocs/charging_system/genesound_charging_system.html And you need to check the regulator by bypassing it. As when your key is on it should...

but the battery is just brandnew, is it possible that it charges with too little of amperage and that i need to check the alternator going to the battery?

Hey all! I finally got a new battery for my cb750c. One with a digital display that lets me know when the battery is getting low by beeping or flashing the display. I just put it in my bike and went for a ride. I started a couple of times and went on the ride. When i came back( with lights and...

Does the sound go away with the clutch pressed in? Maybe it can also be the chain that connects the crank with the gearbox. It makes a rattly kind of sound on my CB

Not to hate but did you check compression? Mine goes way harder with a good starter and battery. This is more like no compression is even existing. Did you check the basics? Compression, spark and are your plugs getting wet or smelling like gas? What happened, did the bike hydrolock or...

About a month later, tried to drive it everyday: Bike starts up better, no more choke and such needed. Bike is sort of waking up, the idle jumped from a steady 1,5k rpm to 2k, i suspect that it has something to do with the fact that the exhaust valves are getting clean, and therefore i need to...

okay so i changed the plug to iridium and the bike finally revs like it should, still a somewhat hard start but i am thinking that the bike needs some tweaking on the carb end again(i turned the 1 and 4 cyl a bit more closed then 2 and 3). Compression has been tested and 1 and 4 are still a bit...

good luck and keep us posted, really eager to know what your issue is.

when you pull the carbs apart consider getting some rebuild kits for them, makes the job easier and also ensures that your carbs are back to spec(air cut off valves tend to be a bit stiff with a bike this old). I didn't do mine but checked them when they cleaned my carbs.

You may also need to check the cdi boxes under your seat, if they are the black type they tend to crack and leak and cause a weak spark.

The rubber can dry out indeed, but when u still have a leaky petcock about 3 days from initial startup you may need to replace the bastard, i use cmsnl.com(a great partstore) for used or new stock parts. Ships fast and is reliable. never use cheap petcocks, they tend to leak when in off and...

thats why i always fill up with 98 or more, we rarely have ethanol free gas here in the netherlands, i find it a bit unpleasing that 98 is also 5% ethanol. I always go to fuel stations that claim that their 98 is ethanol free. will make the bike much happier. I also put in some lead replacer...

Thanks for the advice, but the carbs have been rebuild with rubber orings that make the choke sometimes hard to close, shall i lube the orings with a bit of oil or smth to make the choke close all the way and make it a bit smoother. Will do a compression test and also a syncing when the engine...