Topic: CB350F Issues

[fletcha221]

2 things:

1. There is some oil coming out of the cam breather tube. It's not a lot, but enough to drip on the carbs (Like a dumbass I cut the thing short to hide it.) Is this normal?

2. I am getting serious hesitation and she really wont run wide open. The carbs have been partially rebuilt and completely cleaned. I'm assuming it's starving for fuel, what should I check first, second, third, etc. The tank has been professionally lined and the petcock has been rebuilt. The bike idles and rev's freely (even high rev's). However, when I am under way, she just wont do wide open throttle. HELP!!!!!

[Gordon]

1.  A very small amount of oil coming from the breather is okay.  Is it possible that some or most of the liquid is just condensed water vapor that's been made dirty by the inside of the tube?

2.  Before we can get into dealing with the running issues please let us know of any and all changes from stock, even if you don't think it would make a difference, as well as anything else that you know of that's been done to the bike, regular maintenance or otherwise. 

[Deltarider]

Since you've worked on the petcock, make sure the fuel line(s) aren't kinking and in so blocking fuel flow.

[fletcha221]

The bike is internally bone stock, and has not been pulled apart. The bike is running pod filters and a new dyna-s ignition. The fuel likes are not kinked (thank you for the advice though

The origional carbs where parted off (they where junk). I purchased these carbs off of fleabay, from what was noted "a running bike". I pulled the carbs apart, cleaned everything, Used a air compressor to be sure there where no clogs. I then replaced the slow jets and everything that sits in the bowl. I DID NOT REPLACE OR ADJUST THE NEEDLE. I chose to keep them as is due to the "Running" condition of the donor carbs. I'll be honest, the honda manual I have says very little about adjusting the carbs at all, so I left them as is. The floats work perfectly and the bike does not leak gas from the overflows. The exhaust is is stock, but has been chopped (right where it goes from 4-2). I haven't seen any torque cones for the CB350f, could that be the issue? I would think that would lead to high end power loss, not complete hesitation.

The bike does not apear to be running lean (from what I hear, it would be backfiring it it was?) and the plugs look as they should, a nice light brown. The hesistation only really happens when I am in gear, not when reving. When the bike revs at high rpm, she will throw off a little black smoke (gas). I'm thinking this is good, but maybe a little too rich?

Last but not least......the spark. Is it possible the spark advancer isn't working correctly? I'm really at a loss here.

Here is how the bike is setup if I was not clear.

http://cb350fcafe.blogspot.com/

[Gordon]

From what you say, it doesn't sound like the carbs have been re-jetted and adjusted to compensate for the pod filters and unbaffled exhaust.  Is this the case?

[fletcha221]

That is correct. Stock carbs, not so stock pods and exhaust.

[HondanutRider]

Stock carbs, not so stock pods and exhaust.

I would say you have stated the source of your problem.

[Gordon]

Stock carbs, not so stock pods and exhaust.

I would say you have stated the source of your problem.

Yep.

If you want it to run right you either need to go with the stock intake and exhaust or get to know your carbs really, really well and set them up for the changes that have been made. 

[fletcha221]

Has anyone heard of torque cones for the cb350f? Maybe that would provide the back pressure to stop the hesitation? Do the cone filters really make a large difference? I would really like to avoid tearing the carbs apart agian.

[Gordon]

Do the cone filters really make a large difference? I would really like to avoid tearing the carbs apart agian.

Yes, they do.  You've already had two people tell you that's what is causing your problems.  If you need more corroboration do a search from the main page for "pod filters".