Trying to identify this part. Rotax fr125 pre evo

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PaddyM

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HI there,

Just doing basic maintenance on my rotax engine before I go out my first outing. Took the chain guard off to lubricate the chain and see this casing behind the small sprocket is cracked. Could someone identify this part for me please so I can source another.
While on the subject of engine maintenance, what spark plug are other rotax owners using ? I do not race mine, only used on practice days
 

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HI there,

Just doing basic maintenance on my rotax engine before I go out my first outing. Took the chain guard off to lubricate the chain and see this casing behind the small sprocket is cracked. Could someone identify this part for me please so I can source another.
While on the subject of engine maintenance, what spark plug are other rotax owners using ? I do not race mine, only used on practice days


Clutch drum! (y) 😁

A quick search suggests that the new Evo and old Pre Evo style clutch drums are the same. However, please check with whoever you order with.

It might be a good idea to remove the drum and inspect the clutch etc. You can also buy a new style conversion kit complete, if indeed you want the new style clutch. If indeed that is a Pre Evo unit.


In regards to plugs, I have been recomended Denso. I believe alot of people run them as I see them quite alot. IW24 cold weather, IW27 average spring/summer weather, IW29 very hot summer weather.

 

PaddyM

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Top advice as usual Adam. I think I will take the drum off and inspect the clutch. If all good I may just source the drum so I can get out and maybe upgrade at a later date. Regarding inspection of the clutch, what am I looking for to tell if in good or bad condition ?
 
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Top advice as usual Adam. I think I will take the drum off and inspect the clutch. If all good I may just source the drum so I can get out and maybe upgrade at a later date. Regarding inspection of the clutch, what am I looking for to tell if in good or bad condition ?

It will all more than likely need a good clean before inspection. If it's the old style clutch then check the shoes for wear and make sure none of the springs or shoes have fractured. If it's the new style clutch then it's a one piece unit, check for cracks etc.

I'll be honest the best and easiest advice is from Derek here:


You'll also find the repair manual here (Page 127 is what you want):


Both are for the new style clutch but the same principles apply!

Old style clutch (Plus starter gear and drum):
Rotax-max-old-style-clutch-Go.jpg


New style:
new.jpg


Zip North sell old style shoes and a repair kit:


 

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