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Offline colinpearce

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cm400c
« on: October 27, 2025, 09:51:19 AM »
Hi wondering if anyone can help. Rebuilt 400 all standard air filter, carb jets etc.. The bike seems to intake too much air?  holding a foam piece over intake under seat runs like a dream (pun?).
  Checked all twice intake seals, has new intake rubbers, even engine breather fully attached to air box.
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Offline newday777

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Re: cm400c
« Reply #1 on: October 27, 2025, 11:18:56 AM »
Welcome aboard the forum colinpearce

Is this on the 2 cylinder CM400C?
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline colinpearce

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Re: cm400c
« Reply #2 on: October 27, 2025, 11:26:46 AM »
yes it is custom cb400n
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Online BenelliSEI

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Re: cm400c
« Reply #3 on: October 27, 2025, 02:13:45 PM »
Try raising the float levels?
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Offline colinpearce

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Re: cm400c
« Reply #4 on: October 27, 2025, 04:10:01 PM »
Hi sorry for late reply both float levels are correct I also own a 750 sohc and a 500/4 I know float levels and balance are important, thanks for the thought though
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Offline carnivorous chicken

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Re: cm400c
« Reply #5 on: October 27, 2025, 04:26:24 PM »
Not super familiar with these bikes and just a guess, but they've got that exhaust with the crossover part -- are you running stock exhaust?
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Offline colinpearce

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Re: cm400c
« Reply #6 on: October 28, 2025, 11:19:12 AM »
yes everthing is standard
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