SOHC.co.uk Forums > CB350/400
A couple of "tune up" questions...
Mikep328:
Tomorrow, in hopes of eliminating that off-idle stutter, I'll try turning the airscrews in another 1/8 turn and also replace the spark plugs. I couldn't find non-resistor NGKs but did find non-resistor Densos. I can't imagine new plugs will fix the stutter but I wanted to replace them anyway.
I have some other thoughts re stutter elimination but I'll wait to see how the above works first.
Johnny4428:
That’s a good move on its own Mike, getting rid of NGK plugs and fitting Denso. To many fakes/faulty plugs about.
Mikep328:
New plugs/airscrew adjustment did nothing to reduce the stuttering. I didn't take my timing light when I walked to the garage since I had checked the timing and it was spot on several weeks ago. But what I want to do now is use the timing light to see if each cylinder is getting regular/consistent spark from the coils in that RPM range. The coils/plug wires are new from DSS, installed in '22 per the receipts.. It also has a DSS electronic ignition installed at the same time. I don't expect to find a problem with those items but I have had strange problems with aftermarket e-ignitions on motorcycles in the past...;)
McCabe-Thiele (Ted):
--- Quote from: Mikep328 on September 16, 2023, 02:49:22 PM ---New plugs/airscrew adjustment did nothing to reduce the stuttering. I didn't take my timing light when I walked to the garage since I had checked the timing and it was spot on several weeks ago. But what I want to do now is use the timing light to see if each cylinder is getting regular/consistent spark from the coils in that RPM range. The coils/plug wires are new from DSS, installed in '22 per the receipts.. It also has a DSS electronic ignition installed at the same time. I don't expect to find a problem with those items but I have had strange problems with aftermarket e-ignitions on motorcycles in the past...;)
--- End quote ---
Can you adjust both 1-4 & 2-3 on your system or is it just one adjustment?
On my Dyna I have both it took quite a while to get both spot on.
Mikep328:
"Can you adjust both 1-4 & 2-3 on your system or is it just one adjustment?"
Just one adjustment. The relationship between the timing of 1/4 and 2/3 cylinders is fixed. TBH, and this might sound weird, I would have preferred that the bike had the OEM ignition system rather than an e-ignition.
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