possible faulty motor

[musicbooks]

Hi Everyone,

Just had my 3.2 yr old Agattu serviced (new chain, brake cables and blocks, marathon tyres fitted, de greased and reoiled etc etc) But have noticed a strange noise like rapid machine gun fire or helicpoter rotor blades coming from the motor or somewhere under or around the pedels. The sound kicks in when I am pedelling uphill with the motor on. The steeper the hill- and subsequent higher the stress on the motor-, the louder the noise. It is so loud that it rattles the frame and turns heads as I pass.
The bike shop mechanic double checked chain and gogs etc but couldn't work it out.

It sounds quite serious. What could it be?

BW
musicbooks

 

[flecc]

It sounds like the 9 tooth motor sprocket may be jumping teeth on the chain. New chains on old sprockets often cause trouble, but the sprocket is reversible as a short term fix if tooth wear is apparent.

There's a page on my Panasonic unit support site has several links to these transmission problems with the correct idler adjustment shown:

Maintenance

One of the links details replacing the motor drive sprocket and the reversal tip.
.

 

[musicbooks]

Thanks Flecc,
You've probably hit the nail on the head (or the chain on the sprocket!).

I'll take it back to the bike shop and show them your advice /instructions page.

BW
musicbooks
p.s. apart from this prob, the bike has been absolutely fine...the ribs finally healed too!!

 

[flecc]

Glad to hear that your "repair" is better than the bike's one Tom. Just in time for the nicer weather.
.