SOHC.co.uk Forums > CB500/550
550f running rich?
DomP:
Just to clarify, the breather hose isnt blanked but its connection to the airbox is. The hose itself is routed to the same place as the carb breathers
DomP:
--- Quote from: McCabe-Thiele (Ted) on October 11, 2025, 11:40:02 AM ---There is a simple test to check if the valve timing is a tooth out.
No cam cover removal just something to do with what the valves are doing at tdc?
IIRC Bryan or Ken posted it ages ago.
I've forgotten what you do, it might be in my 500 rebuild blog.
--- End quote ---
That's interesting Ted, be great to know what the method is to rule that out.
McCabe-Thiele (Ted):
It's on my 400 project build, I cold not remember if I set the valve timing to tdc or on the F mark. It's sort of mentioned on P 19.
I suspect I asked the question on the 400 section
K2-K6:
--- Quote from: DomP on October 10, 2025, 11:46:12 PM ---The springs have been trimmed byba preious owner, if anything one is too taught. The advancer itself has benn taken apart and greased so should be no free movement problems.
--- End quote ---
I'm suspicious of this as a modification generally, also the logic behind it.
Ignition is retarded to first start it .... without it trying to go backwards! .... secondly to make it tick over smoothly and to prevent it "hunting" around but stay calm when not needed.
Other than that, and say above 1500rpm, then advancing it quickly will usually increase torque from low into mid range output .... which is desirable. To delay that effect seeming pointless as you want it to get on and go a bit.
They are quite low compression for the output, and so will not usually be at risk for getting the advance going as early as possible. To mod them with tighter springs apppears to fly against optimal running
DomP:
That's interesting, I did look at 750 advancers thinking the springs might be the same as i cant find any 550 advancers. One of my springs has been over trimmed in my opinion
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