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Hey!
I have a 1970 CB350 twin with pods and jetted, I soaked the carbs over night, put it all back together, starts first kick but when I crank on the throttle it tops out at 3 grand and sputters a bit.....
Am I just getting too much fuel or what? Thanks in advance.
To be honest I cant remember the size, everything worked well with the re jet until recently. I got the jet kit from 6sigma, timing and valves are good.
3k is about where the main throttle jet kick in. could be too rich. could be the rejet or the needle height. or of course something else, but check those things first. do you still have the original jets? how did it run when you had those in?
This is one of those "too many variables" things. Definitely sounds like the carbs though. I want to say pull the carbs and dismantle them. Either there is a jet loose, physical obstruction of the slide (doubt it), or maybe a hole in the diaphragm?
Let's go back a couple of steps. You mentioned that it ran alright with those jets for a while and now it's NBG? How old is the gas? Modern E10 goes stale in 2-3 weeks and progressively deteriorates from there.
If the tank and carbs were drained and the gas is new and fresh, pull the pods off and blip the throttle and see if the slides rise and fall.
Those old Keihin carbs are relatively simple in principle and are a little different than regular carbs when it comes to jetting them. Do you remember if the mains were changed or the needle clips or pilot jets?
On a CV carb the slide rises with gas velocity and that's a function of revs and load. Change main jets to tweak the very top end at WOT, needle position for mid revs and float levels or air jets to get the mid range back into play.
But let's start with a freshly charged battery and fresh gas.
Stock CB350 CV carbs dont have adjustable needles....you can shim them...but thats it.
Stock jetting will work on these bikes with pods, velocity stacks, open carbs.....and modified or stock exhaust.
35pilot
68/105 mains
3/4turns out on the air screw
Anything outside of that with a stock motor will give you issues. These bikes arent like modern day bikes that need to be rejetted anytime a little change is made. They are very die hard.
One thing to check is your rubber diaphrams at the top of your slides. If one is torn....you may have a hard time getting the slide to raise.
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