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...because every day is MotoGP day when you own a CBR 125r...
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PostPosted: Sat Feb 21, 2015 6:59 pm 
Racing ECU (!!)
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Joined: Sun Mar 23, 2014 9:21 pm
Posts: 535
Location: Parksville, BC, Canada
Hi Folks!

One of the common complaints about the CBR 125 R for new owners are shifting issues. There tends to be two primary issues that people complain about;

1) Popping out of gear/False Neutrals
2) Shifter Slop in the linkage/Bad Shift Feel.

Let's take a quick look at both of these so that you don't have to put up with sloppy shifts etc.

Popping out of gear / False Neutrals

This is really common on new bikes and it's caused by the transmission not being broken in. It's very common for the bike to pop out of 5th & 6th and go 'false neutral' until the bike has about 3,500 Kilometers on it and it's properly broken in. It's nothing to worry about but if you don't know about this it can be a little disconcerting. This is common to many more bikes then the CBR 125 R - a lot of Ducati owners have complained about similar issues and you'll see it on many other bikes. It goes away in time.

This brings up a neat work-around which is actually good shifting practice. That is to say, you can and should make this your default shifting procedure. When shifting keep holding the shift lever up until after you have completed the shift and let out the clutch. This really is 'best practices' stuff for any bike and it will work around the popping out of gear/false neutral that you experience with new transmissions - regardless of what you ride.

Shifter Slop / Linkage Slop / Poor Shift Feel

This one is pretty easy to case. The stock linkage is non-adjustable so you want to make sure that neither the linkage nor the shift lever are bent. If they are, replace them. If your bike has a lot of miles on it you may want to look into replacing several of the components. They are not much money new from Honda. All of the linkage does wear with use. The linkage at the rear (near the shift lever) usually gets drenched in oil when lubricating the chain which is really helpful. If you never lubricate the chain or ride in the rain a lot then everything will likely be dry and worn.

The biggest area of wear, and cause of slop in the shift linkage, is at the shift lever itself where it passes through the left aluminum step. (see attached photos) The shift lever is steel and it's passing through aluminum. Every time you shift the steel rotates in the aluminum. You can probably see where I'm going with is - it acts a little bit like a drill. This means that it's a common wear point - the steel wears away the aluminum and this means a considerable amount of side play in the shift lever.

Folks with a new bike, the best thing you can do to prevent wear in this location is to pop the retaining ring off, push the shifter in towards the bike, and then lubricate the shaft. You don't need to remove the shifter to do this. Once lubricated you can just push it back in. It will help decrease the wear from the steel shifter in it's aluminum bore and you will feel the difference right away. I used to do this, forgot to do it for a while and now have a considerable amount of wear in this area to the extent I'll be looking into how much the left step costs on Monday :ohmy:

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Best & Thanks!
Marvin Miller
cbr125world Store

...because every day is MotoGP day when you own a CBR 125r...
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