Author Topic: CB550 Float Bowl Screws  (Read 134 times)

Offline GTB981

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CB550 Float Bowl Screws
« on: February 19, 2020, 03:22:01 PM »
I have been chasing fuel leaks for the past few weeks. New fuel tap (OEM), float valves and seats, float pins. Put it back together once and float bowl gasket seal leak (my fault). Put it back together again and leak from number 2 caused by float valve seat not in fully (again my mistake for not double checking) saw it as soon as I lifted the float bowl. Fixed and started to re-assemble and now one thread on No 2 float bowl is  not holding torque as thread partially stripped. Are these M4 ? Could I helicoil it or do I need to source another carb body ?

Thanks for your help.

Offline Bryanj

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Re: CB550 Float Bowl Screws
« Reply #1 on: February 19, 2020, 03:31:27 PM »
Not sure on thread but it can be helicoiled

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: CB550 Float Bowl Screws
« Reply #2 on: February 19, 2020, 03:50:14 PM »
We helicoil all our float bowls as a matter of course as they strip for fun. When Trig appears, I will ask him what size screw ( I should know off the top of my head as I sell packs of replacement JIS Screw sets for them in my Fleabay Shop but, I can't remember 🙄🙄🙄🙄)
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Raymond_Y

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Re: CB550 Float Bowl Screws
« Reply #3 on: February 19, 2020, 03:58:47 PM »
They are M4 threads

Raymond
Raymond

1971 CB500K0 (being rebuilt)
1977 CB550K3 (bases for future 650 cafe racer)
Q plate CB550 in bits

Offline GTB981

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Re: CB550 Float Bowl Screws
« Reply #4 on: February 19, 2020, 05:50:44 PM »
Thanks all, I managed to find an M4 in my box of bolts with allen key head (don`t tell the rivet counters). This clearly had a better thread and has held well. Carbs are now back on awaiting trial. About 4th time lucky !

 

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