SOHC.co.uk Forums > CB750
re-jetting needed?
totty:
You've got a whole mix of symptoms going on, not surprised you're going crazy.
There's probably more than one problem, might be time to find a local specialist or a dyno tuner who's good at diagnostics.
Greebo:
--- Quote from: totty on July 03, 2017, 04:06:17 PM ---You've got a whole mix of symptoms going on, not surprised you're going crazy.
There's probably more than one problem, might be time to find a local specialist or a dyno tuner who's good at diagnostics.
--- End quote ---
Yes I agree, not sure where you are located El_Burro...but I have let you and everyone else on here know "Please Do Not Use Torquetune at Ollerton"
he made an absolute & complete bollocks of my carbs & another company had to sort them out, it cost me a not once but twice..
Thankfully now mine is running great, but it nearly drove me crazy at the time.
El__burro:
Getting close..
I realized that carb 4 (choke) slide wouldn't open probably causing most of the problems. Also testing the coils realised that some wire and cap connection were loose.
Anyway after a short ride i could feel the 3rd part of the throttle not pulling much power.
What next?
Thanks
el__burro
Sent from my SM-G935F using Tapatalk
totty:
Are you confident that you've found all issues and you're ready to go back to jetting, or do you want to check for more issues?
For jetting you'll need to start with the mains and either keep increasing until you've gone too rich then go back a step, or do plug chops, or a rolling road.
A full checkup would be along the lines of
Ignition:
Advancer not seized, and confirmed working by strobe
points not pitted
points gap and timing correct
condensers tested, or a visual check for points not sparking
primary and secondary resistance check for both coils
plug cap resistance check (plug or cap should be resistor type but not both)
consider new plugs
Carbs:
chokes open as already covered
all passages clear
all jets showing no signs of wear
float heights set and float valves tested
all throttle open evenly, fully and are static balanced
no inlet manifold leaks
clean airfilter(s)
I'd also do a compression test
To be honest last time I had a flat spot to deal with I replaced the entire ignition system with a Boyer kit, it saves a lot of time and effort if you don't have to focus on both fueling and ignition at the same time. Although in your case I'd try to go back to standard airbox and filter so you can run stock jetting.
El__burro:
A full checkup would be along the lines of
Ignition:
Advancer not seized, and confirmed working by strobe 👍
points not pitted 👍
points gap and timing correct👍
condensers tested, 👈 》trying to test but what's the best way?
visual check for points not sparking👈 》actually points 1/4 have a tiny blue spark when operating.
primary and secondary resistance check for both coils
plug cap resistance check (plug or cap should be resistor type but not both)👈》 that's next. I'm not sure about result on primary coil.
consider new plug 》Are this the right type? (pic)
Condensers?
Thanks
el__burro
Sent from my SM-G935F using Tapatalk
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version