Chirping cb160

Jlovvorn · Post by **Jlovvorn** » Mon Jan 13, 2014 4:07 pm

Ran fine for a year fine, then kicker went out.

Tore it down, replaced kicker, used same bottom end, etc.

Put on 175 jugs and pistons, same head and cam (cleaned up).

Ran like a beast for 9 months with no chirp, but always was erratic at idle.

Then the chirp set in. First minor, now major.

Thanks for responding!

Top ideas:

Intake leak
Cam chain
Cam bearing
Bottom end bearing of one type or the other.

Hoosier Tom · Post by **Hoosier Tom** » Mon Jan 13, 2014 4:15 pm

Does the noise change at all when you pull and hold the clutch lever?

HT

Jlovvorn · Post by **Jlovvorn** » Mon Jan 13, 2014 4:18 pm

Negative.

Hoosier Tom · Post by **Hoosier Tom** » Mon Jan 13, 2014 4:44 pm

I'd check the easy to get to stuff before dropping the motor. From your flickr photos you are not running an electric starter, right? I would remove the left cover and make sure the starter sprocket isn't rubbing on 28117-216-000 the setting plate. Also make sure if your starter clutch still had its rollers/springs/caps that they are not causing issues, or that the starter clutch screws aren't backing out and rubbing their heads on the sprocket.

HT

cknight · Post by **cknight** » Mon Jan 13, 2014 4:51 pm

On CB77's That I've run without a starter, the stamping that's used to position the starter sprocket is installed to control side to side movement. It's also been drilled and tapped for a 6mm bolt to engage the teeth, keeping the sprocket from rotating, just as if it would be if a starter was installed. Regards, Chase

Jlovvorn · Post by **Jlovvorn** » Mon Jan 13, 2014 5:11 pm

Wow, I didn't even consider starter remnants causing this. Thanks!

Jlovvorn · Post by **Jlovvorn** » Mon Jan 13, 2014 5:14 pm

I think you mean #6 on page 2 here.

I can't say I even know what this part is, or what it does, but will take a look.

http://www.mottomoto.com/Build_Program/ ... rt%201.pdf