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CB350 1971 Restoration Project
philward:
Did make a difference - more so on the left carb, but yes. Bit inconsistant and depends on the how I done the other settings. I first synch'ed the tickover screws using a feeler guage to balance the tickover. Then synch'ed the carb openings using the individual cable adjustments at the carb end. Then set the tickover - screwing the individual screws out equal amounts. The mixture screws responded better after the above setting sequence.
philward:
Started up after actions taken in previous post - revs returning to idle better but still little response to slow running screw adjustment on R/H cylinder (and now no leak on intake manifolds) with misfire (pop) when slow speed screw backed out more than 1/2 turn. Should have checked that curcuit while I had the carbs off! I'll take the carbs off again and check the low speed curcuit for blockages - I'll feed any progress back Ben.
Also got a noisy tappit on R/H to sort when engine back to cold and strangely, the R/H silencer is far louder than the L/H (both new).
florence:
Is it worth running without air filters attached for a test just so you can see if slides are popping back down in good time and together when throttle is released?
philward:
Good shout, I'll try that - thanks
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BenPowell:
--- Quote from: philward on September 27, 2023, 12:27:34 PM ---Started up after actions taken in previous post - revs returning to idle better but still little response to slow running screw adjustment on R/H cylinder (and now no leak on intake manifolds) with misfire (pop) when slow speed screw backed out more than 1/2 turn. Should have checked that curcuit while I had the carbs off! I'll take the carbs off again and check the low speed curcuit for blockages - I'll feed any progress back Ben.
Also got a noisy tappit on R/H to sort when engine back to cold and strangely, the R/H silencer is far louder than the L/H (both new).
--- End quote ---
Thanks for the updates Phil, after adjusting the timing the other night and re-checking the valve clearances I can say it has made no difference to the popping except I now have a noisy valve which wasn’t before (shouldn’t have messed with them) pretty sure it’s just the one.
Checked for air leaks by spraying around the carb boots while running and that also made no difference to the RPM so it’s got to be something not right in the carbs, again mixture screws did nothing,
With regards to more noise from one silencer, to me that sounds like one cylinder is doing more work than the other, one of mine felt like it had a lower pressure from the exhaust so I increased the idle screw on that side and it brought it back inline.
I briefly unplugged the HT leads on each cylinder the one which was quieter cut the engine almost straight away, when i took the other off it continued to run for a bit.
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