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1972 honda cb350 - EXPERT Advice needed

This is a discussion on 1972 honda cb350 - EXPERT Advice needed within the Vintage forums, part of the Types of Bikes category; Originally Posted by stratocaster81 will cb350 run with straight pipes i saw on the internet somewhere that it wont even ...

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Old 06-13-2010   #11
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Originally Posted by stratocaster81 View Post
will cb350 run with straight pipes
i saw on the internet somewhere that it wont even idle if there is a hole in the muffler.
Not true.

It will run BUT....It will run poorly.

If the Cb350 has straight pipes it will backfire because more air can go out of the engine and the mixture will be lean.
The air pilot screw will need to be adjusted to make the mixture richer.
If you put the stock mufflers on it should run fine.

To get the mixture right just find another person that has straight pipes and ask them what adjustments oR jets they changed.
Someone on this forum may already know.

Also make sure the rubber diaphrams in the top of the carb do not have any splits because if they do, it will never idle or run very well.
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Old 06-13-2010   #12
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You already figured out that valves adjustments, carb jettings and adjustments are in balance with a calculated resistance created by intact OEM mufflers or equivalent.

Another major factor to consider is engine compression, which must be similar on both cylinders and at least 100psi to start and idle properly. Poor or uneven compression makes any carb adjustments quite useless.

If compression test is uneven or poor, try adding a teaspoon of motor oil on the piston by the spark plug hole. If compression is much improved, piston rings are likely worn. If compression is unchanged, the valves are probably leaking. Unless it is only out of adjustment, engine head would have to be professionnaly refurbished in both cases. If oversize piston and rings are required, make sure you have all parts on hand including connecting rod bolts and piston clips that cannot be reused. CB 350 was a very popular model, so there is a slim chance you find all parts, but parts, shipping and labour cost would be very high.

I've been trough the experience on my CM400T which is very similar at the engine level, but with electronic ignition.
There is nothing like riding a vintage Honda MC !
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