86 Honda shadow vt500c. Recently cleaned Carb new spark plugs fresh gas. After third gear when I accelerate it loses power and bogs down really low. Thoughts?

SOURCE: low power from low to middle rpm

its not getting enough air to the carb

SOURCE: Honda shadow running lean

Hi and welcome to FixYa,

I can't comment yet on the "neoprene tubing...coming from...carb to the engine" as I have to get hold of the service manual to confirm.

However, if the sputtering is consistent on reaching a certain RPM rather than speed on any gear, then there would be a most likely air leak. Verify that the air box/enclosure is tightly sealed, seated on to the carbs securely, the coupling locked in correctly, the air filter positioned correctly and the box cover tightly seals the whole enclosure.

This condition is also possible if the air filter has been replaced with an aftermarket open breather such as some models of the K & N wihtout rejetting and carb tuning.

Good luck and thank you for using FixYa.

SOURCE: 1986 honda shadow vt500c throttle hesitation.

If your bike has carbs and not fuel injection, ( difficult to remember back 23 years ago ), then remove the carb slides and move the clip on the jet needle down one notch. This will richen the low end mix and provide it sooner. You may need to go two notches but start with one notch. Also, sync the carbs such that the slides on both carbs move at the same exact instant when the throttle is slowly turned from idle speed < engine off. Clean the carbs when you get a chance.

Please rate this solution. Thanks Cindi!

SOURCE: 86 Shadow Running rich?

best thing to do is reset mixture screws to standard then get the carbs balanced,it will make a big difference

SOURCE: Front brake too stiff on 1984 Honda Shadow VT500C Shadow

You should have disc brakes??? They are not adjustable.
It is common for a caliper piston to freeze up or become corroded and bind up so it will not move freely.