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Author Topic: Why would a stock '72 cb750 have #110 main jets?  (Read 16607 times)

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Offline wrenchmuch

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Why would a stock '72 cb750 have #110 main jets?
« Reply #25 on: May 23, 2012, 07:10:17 PM »
I hope Hondawggie finally rode his bike.
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Re: Why would a stock '72 cb750 have #110 main jets?
« Reply #26 on: May 23, 2012, 07:12:03 PM »
Original poster not active on this thread since Nov. 10th 2011... :o :o... another long dead subject dredged-up by Lucky.... go Lucky  ::)
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If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline Tews19

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Re: Why would a stock '72 cb750 have #110 main jets?
« Reply #27 on: May 23, 2012, 07:38:17 PM »
AHH very cool thread. Just went throught this with my K1. Had 130's in it.. PO said engine was done up.. Who knows.. Not me of course. Bike ran like poop. SOHC DIGGER helped me sort the carbs and changed ot the 130's for 120's... Bike runs much better... Stock airbox and kerker on it
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Offline KeithB

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Re: Why would a stock '72 cb750 have #110 main jets?
« Reply #28 on: May 25, 2012, 05:02:29 AM »
Quote
Original poster not active on this thread since Nov. 10th 2011...
As it worked out, a very timely revival for me as the "search" function wasn't working.
"Lucky" break I guess... ::)
Anyway, found 110's in my stock '72 and tried 120's instead.
Bike ran like crap!
Back to 110's and all good.
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Offline chewbacca5000

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Re: Why would a stock '72 cb750 have #110 main jets?
« Reply #29 on: May 27, 2012, 12:15:29 PM »
Quote from: Tews19 on May 23, 2012, 07:38:17 PM
AHH very cool thread. Just went throught this with my K1. Had 130's in it.. PO said engine was done up.. Who knows.. Not me of course. Bike ran like poop. SOHC DIGGER helped me sort the carbs and changed ot the 130's for 120's... Bike runs much better... Stock airbox and kerker on it

Thank's Tews!  This helps as I have a Kerker on a 1975 Cb750 stock air box, 105 main jet and it needs choke to stay smooth. 

Do you know what the clip position is for your bike?
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Offline lucky

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Re: Why would a stock '72 cb750 have #110 main jets?
« Reply #30 on: May 29, 2012, 01:57:35 PM »
Quote from: KeithB on May 25, 2012, 05:02:29 AM
Quote
Original poster not active on this thread since Nov. 10th 2011...
As it worked out, a very timely revival for me as the "search" function wasn't working.
"Lucky" break I guess... ::)
Anyway, found 110's in my stock '72 and tried 120's instead.
Bike ran like crap!
Back to 110's and all good.

But was the exhaust stock??
The main jet is usually the very upper end of the throttle range.
You say it ran like crap/ What does that mean?
Did it idle?
Did it start poorly? What?
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