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Doms CB550F1 project
McCabe-Thiele (Ted):
Trying to think outside the box - could it be timing related - mechanical advance not falling back as it should?
DomP:
--- Quote from: McCabe-Thiele (Ted) on July 13, 2024, 02:19:20 PM ---Trying to think outside the box - could it be timing related - mechanical advance not falling back as it should?
--- End quote ---
Now you say that, I remember chatting to Ken about my trimmed advance springs. I'd rather have standard untrimmed ones but someone in the past has cut and bent the end coil
K2-K6:
--- Quote from: DomP on July 13, 2024, 04:00:52 PM ---
--- Quote from: McCabe-Thiele (Ted) on July 13, 2024, 02:19:20 PM ---Trying to think outside the box - could it be timing related - mechanical advance not falling back as it should?
--- End quote ---
Now you say that, I remember chatting to Ken about my trimmed advance springs. I'd rather have standard untrimmed ones but someone in the past has cut and bent the end coil
--- End quote ---
That shouldn't, in and of itself, cause problem with tickover. It would make the "closed" position more assured to enhance stability at idle by not fluctuating at those low rpm.
Worthwhile double checking your static timing point against the F mark tough, as anything in advance (firing too early) would go to making it more difficult in settling back to consistent idle rpm.
I dont agree with shortened springs though, certainly without then getting quantification of how the advance curve plays out. Arriving too late will at the needed advance specification will reduce low rpm torque output. You'd need to accurately measure at what point in rpm range it reaches full status.
But, as noted though, that's an issue as you're asking for power and not lowest rpm stability.
DomP:
Are correct springs still available? I'm not sure I understand everything you've said there K2-K6
Bryanj:
Springs were never available as a seperate part you have to buy the complete unit, pattern ones are now available BUT a member on the US site found the 750 one had the F and T marks incorrectly positioned, you need a 500 part anyway.
I think DS lists them and 4 into 1 in US but watch out for duties.
One bit i dont have lots of, could possibly lend you one for testing purposes
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