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Author Topic: 4 into 1 exhaust  (Read 1350 times)

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Offline scooter1

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4 into 1 exhaust
« on: December 13, 2009, 09:44:59 AM »
my bike is a stock 1978 750k and I'm getting a 4 into 1 exhaust.....will It work without having to make any changes like re-jeting
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Offline ekpent

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Re: 4 into 1 exhaust
« Reply #1 on: December 13, 2009, 10:10:00 AM »
The best way to tell will be to ride it. A lot of bikes react different depending on how worn the needles and other parts on the carbs are. People usually step up the size of the main jet a little.
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Offline slowjo

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Re: 4 into 1 exhaust
« Reply #2 on: December 13, 2009, 11:03:02 AM »
I replaced mine with the mac 4-1 on my 71 CB750 and it runs just fine with Stock jets.
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Offline ekpent

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Re: 4 into 1 exhaust
« Reply #3 on: December 13, 2009, 12:13:40 PM »
As long as you keep the stock airbox set-up you will probably be fine.
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Offline scooter1

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Re: 4 into 1 exhaust
« Reply #4 on: December 13, 2009, 01:39:18 PM »
cool thanks guys!!
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Offline Really?

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Re: 4 into 1 exhaust
« Reply #5 on: December 13, 2009, 06:20:15 PM »
bumped mine up 5 with the mac 4-1 and stock airbox.  a plug chop will put you in the right place though.
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I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3
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