Rieju rs3 2015 wont start

[ryanwebb]

Hi guys, I'm new here and need some help my partner has a Rieju rs3 125 2015 model.. It is a Spanish bike with a Yamaha yzf-r125 (2010) engine she's only done 3,000 miles on it but now we have an issue with it starting.

I've changed the battery, CDI and starter motor. Turns out it's the starter clutch or Bendix I think it's called.. It keeps working loose off the starter motor by the looks of it, and when I push the start button i can just hear the starter motor spin. Is there an easy fix for this?? the teeth look ok and make a good connection

 

The bike will bumo start easy everytime.

[Davidtav]

Might need a bit of lubricant?  Spray with wd40?

[Mississippi Bullfrog]

You can get a repair kit with the springs, caps and rollers for £20 from Wemoto. It may be that the clutch is sticking in which case WD40 might free it off but it isn't a lubricant so will soon stick again if that is the case.  

[Old-codger]

If the starter is engaging with the gear it could be the sprag clutch has failed/failing. This sits in the back of the rotor housing/generator and is a one way clutch. What happens is when starter engages with the gear the rollers in the clutch engage onto the crank and spin the engine, the engine fires and the rollers dissengage. Over time the rollers delelop flats so they dont roll very well and grip the crank and the springs behind them weaken. On big triples and twins this can be a problem as batteries get weaker and havnt got the whack to turn the engine over fast enough which in turn puts strain on the sprag clutch causing it to fail and in some cases cracking rotor case/gear. But I doubt it if it will be that bad on your bike. This is what the sprag clutch looks like as an example. Genuine Yamaha Sprag clutch 21CE558010 & Gasket YZF-R125, WR125, MT125. | eBay