SOHC.co.uk Forums > CB750
re-jetting needed?
El__burro:
good day,
I have been riding my cb750 k2 for over a month and today I went back to ride my Bmw r80/7 and
i have noticed a huge difference in maximum speed and overall performance.
my cb750 is definitely slower.
i have synced the carbs but not fully understood how to set the air mixture the same for all 4.
also I have replaced the standard air filter for K&H (like) stacks and gone to a 4-2 exhaust system but kept the stock jets..
would i see any difference in changing their size.
if yes, what size?
Thanks
el__burro
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hairygit:
Yes, increasing the jet size is necessary running stack or pod filters. As they are more free flowing than a stock filter set up the decreased resistance means it pulls less fuel through the jets, and gives a weaker mixture. Every bike will behave differently to given changes, so it's trial and error until it runs as best as it can with the filter/exhaust combination. What size jets are you currently running?
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El__burro:
The actual jet are 110.
Since i have both pods and 4-2 exhaust system, shall i go 4 up?
Where shall i buy them?
Thanks
el__burro
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El__burro:
Actually I have just found this..
Shall i go +6 then?
el__burro
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hairygit:
A U.K. K2 should have 115 as stock, so you're way too small at the moment!
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