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Author Topic: cb400F strangled  (Read 902 times)

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Offline 78whiteorbs

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cb400F strangled
« on: March 23, 2014, 06:24:34 PM »
Woke up a cb400F got her running pretty good but seems to top out around 80mph which doesn't seem right at all. When I was running it without the air box it was greased lightening! I removed the air filter as it was an old one and as I was suspicious of it. Still seems to top out around 80 , maybe my speedo is was off....it is the old oem stocker. Am I asking to much here?
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Offline Powderman

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Re: cb400F strangled
« Reply #1 on: March 23, 2014, 06:40:38 PM »
The CB400f had an advertised top speed of 118mph. Wait, that was the later Cb400f. The early ones were 95-103mph depending on rider crouch.
« Last Edit: March 23, 2014, 06:43:37 PM by Powderman »
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Offline flybox1

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Re: cb400F strangled
« Reply #2 on: March 23, 2014, 06:44:13 PM »
What are your jet sizes, air filter condition, and exhaust setup?
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline 78whiteorbs

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Re: cb400F strangled
« Reply #3 on: March 23, 2014, 06:47:33 PM »
all stock, air filter was in there and then removed...I wonder would it make a difference if I forgot to turn the air screws out :) ?!?



« Last Edit: March 23, 2014, 06:53:41 PM by 78whiteorbs »
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Offline FuZZie

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Re: cb400F strangled
« Reply #4 on: March 23, 2014, 07:18:37 PM »
Damn I have an urge to go check to make sure I locked my #$%* up....  ;D

Looks like it has everything, hows the condition?
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