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1967 CB450K0 Black Bomber Rebuild - By Royhall
Oddjob:
498
royhall:
You are correct. Unfortunately I have tried float heights both ways, it makes no difference to the running. Possibly a problem using 500 carbs on a 450, although it has genuine 450 needles and jets.
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McCabe-Thiele (Ted):
--- Quote from: Oddjob on January 14, 2024, 09:20:06 PM ---The float height is measured from the join between the bowl and the body so if you reduce the level it closes off the fuel the float sits higher not lower, higher means more fuel in the bowl, of course I may be on the road to senility 😀😀
--- End quote ---
I'm talking about the height of the fuel in the bowl so we are at cross purposes with the same outcome.
K2-K6:
Are they carbs with coil spring above slide ?
If so, a weaker spring will give more air to same throttle opening that will draw less fuel under same rpm. It'll trim it to run leaner even with the same jet and needle.
There may be an alternative ftom another carb to fit and try.
AshimotoK0:
Those 500T carbs originally had air cut-off mechanisms on them Roy. Did you remove them and make blanking plates for the diaphragms and block holes etc so that the whole accelerator pump function is blocked off? I did this to a set of carbs for Honda guru Bernie Saunders last year and also donated the carbs themselves. He was feeling really low at the time as his wife had passed away and a customer had lumbered him with a problematic CB450K0 to fix, which was also getting him down. I tapped balls of solder to block the surplus holes and made really close fitting thin alloy plates to replace the diaphragms. I got the ultra thin alloy sheet from the outer cover of an old laptop CD drive.
Pretty sure I got advice off Facebook 450 group on this too ... will check.
https://www.vintagehondatwins.com/forums/index.php?threads/cb500t-carbs-on-a-bomber-k0.4360/
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