Gear Rattle
Moderator: Moderator
Gear Rattle
I have a 2001 sa50 with 80cc bore and a set of 8.5 gears,with 25,500 miles.Been having a gear rattle when acceleration, sounds like they are rattling on the side of the case.I opened case and didn't find anything that looked bad.I am thinking it mite be the side cover.
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Wheelman-111
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Re: Gear Rattle
Greetings:
The late '98 to '01 Elites use a plain bearing on the left end of the axle shaft; the shaft rides right in the aluminum socket of the cover.
With that many miles, it's possible that the socket has enlarged to the point where the axle can rattle around in there. The damage might not be apparent.
Measure the axle end and compare that to the socket diameter in the vertical plane. If it's more than a few microns different, that may be the noise source.
A new cover would resolve it.
The '94 to early '98s used a smaller axle end diameter and a second proper ball bearing. I don't care for the later arrangement.
I suspect it was a cost-cutting measure for a product that wasn't expected to rack up so many miles.
Check the end play of the countershaft and be sure to use the correct thrust washers. Some aftermarket Dio gears have different dimensions on the countershaft.
The sealed right axle bearing can be worn, too.
If you plan to ride it to 50K, consider swapping axles and covers for the 2-bearing version.
The late '98 to '01 Elites use a plain bearing on the left end of the axle shaft; the shaft rides right in the aluminum socket of the cover.
With that many miles, it's possible that the socket has enlarged to the point where the axle can rattle around in there. The damage might not be apparent.
Measure the axle end and compare that to the socket diameter in the vertical plane. If it's more than a few microns different, that may be the noise source.
A new cover would resolve it.
The '94 to early '98s used a smaller axle end diameter and a second proper ball bearing. I don't care for the later arrangement.
I suspect it was a cost-cutting measure for a product that wasn't expected to rack up so many miles.
Check the end play of the countershaft and be sure to use the correct thrust washers. Some aftermarket Dio gears have different dimensions on the countershaft.
The sealed right axle bearing can be worn, too.
If you plan to ride it to 50K, consider swapping axles and covers for the 2-bearing version.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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fastplastic
- CB900F
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- Joined: Tue May 11, 2010 7:37 pm
- Location: Manistee, MI
Re: Gear Rattle
had that happen on my nq50 only thing was, it was on the case side so it was a crappy moment 