SOHC.co.uk Forums > CB750
My '71 CB750K1 is quite slow...
PaulS:
Managed to finally track down a firm that has the Nippon Denso plugs in stock (buycarparts.co.uk) and they arrived today: from Germany!
Will get those into the bike in the next few days and let you know if I am on the way to solving my problems...
Fingers crossed.
K2-K6:
If you aren't able to find significant progress with above suggestions, try running it with air filter removed but airbox in tact. It should be leaner in that config and may serve to show you a direction without initially changing jetting.
In other words a quick and dirty "check see" to give low-no cost assessment and help with decision about mixture.
PaulS:
Thanks K2-K; as a born and bred Yorkshireman* I like "low-no cost" suggestions.
And thanks to Oddjob for your comments. I checked the compression last year and that was really good. I also replaced the plug caps, leads and coils some time ago. I'm banking on the plugs being the issue, if not, then carburation, but will let you all know....
(*Yorkshire, where "tin tin tin" is a proper sentence)
PaulS:
"WoooooHoooo!!!" :) :) :)
Just tried the bike after installing the (non-resistor) Nippon Denso plugs recommended by Nurse Julie and....
- the bike started first time AND on all 4-cylinders (that's a first!) - I tried it a few times just in case it was a fluke - and
- it rides with the free flowing urgency I was hoping for.
So far I have only taken it on a 20 mile test ride, but all is well. The spark plugs are showing a tiny bit of soot but I'll give the bike a much longer run before making any fine tweaks to the carburation.
Looks like 7 years of miserable performance has been cured by 4 spark plugs.
Thanks each!
Arch stanton:
Looks like your problem is sorted.
Thank you for letting us know the result. So many times people ask advice on forums. But then don't come back on, to tell others what worked.
Thanks again.
Sean.
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