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cb350four bogging

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matthieuvde

cb350four bogging

hello

so after quite a few issues i finaly completed my cb350four completley and took it for a ride for the first time
it started up perfectley and she ran like a dream, for the first 5 km... after a quick stop to take some pictures i started her up and out of the sudden she ran like crap bogging at any speed or rpm's.
didnt want to climb into the rpms
anymore stoped at around 5k while bogging like crazy, unrideable to be honest.
so i took her home and cheked the spark pluggs, 2 are realy black and two are kinda to white so i gave up and went to look on the o'll interwebs to ask you guys.
the carbs have ben cleaned and rebuild by a honda shop so idk if thats the problem since today was the first time i rode the bike.
thanx, matthieu

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Re: cb350four bogging

Administrator

Which two cylinders had black spark plugs, and which were white? And check the rubber boots between the carbs and head. They might be coming loose after the engine warms up causing a vacuum leak.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
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matthieuvde

Re: cb350four bogging

nr 4 was realy whute and nr one was realt black

TOOLS1

Re: cb350four bogging

Administrator

Do you have an infrared thermometer? If not you can get them at Harbor Freight for around $25.00. If you do take the temperature of the exhaust pipes where they make the bend coming out of the head. Or you could spray some water on them to see which ones are the hottest. This will help in trying to figure this out.
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matthieuvde

Re: cb350four bogging

yep i have one and the pipe on cilinder 2 was less hot then the onther ones but idk what that suggests the problem

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Re: cb350four bogging

Administrator

It is telling us which cylinder is having a problem. It would be the place to start looking. Is there fuel in the float bowl? Take the drain screw loose and see if fuel comes out. Swap the plug and wire from the No#3 cylinder into it and see if No#3 starts running colder, and No#2 runs hotter.
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