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Mini Rok Owners Group

For all things Mini Rok.  Any problems, concerns, neat little tricks you've picked up along the way....... post them here and share your experience and gain a wealth of knowledge. Welcome Owners, Drivers or just interested parties........

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2 Stroke Oils?????????? 1 Reply

What 2 stroke oil is everyone running and what do you recommend. With my engine I received a bottle of Penrite 10thenths 2KOST Full Synthetic, and have been running it at 30:1 using 98 octane fuel. …Continue

Started by Jason Fewins. Last reply by George Frougas Sep 11, 2016.

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Comment by mick on July 3, 2016 at 20:20
Yes it seems early, but my concern is it actually broke! They should wear out, not break. Hazarding a guess here, but how many strike clutches break on j duty?
Comment by Peter Taylor on July 3, 2016 at 14:54

Yes, I've seen this on at least 3 motors, the manual says replace the clutch at 30 hours, ours lost a finger/arm at 31 hours and the others were very similar usage. The positive is we were still able to start (helped by the downhill grid in Orange) and finish the meeting. I now carry a spare and the tools to swap them.

I'm surprised it happened so early for you.

Comment by mick on July 3, 2016 at 0:28
Hi all, We broke a finger off our clutch (not sure how, 13 hrs on the engine...), but wondering if anyone has experienced this before??
Comment by Jason Fewins on November 25, 2015 at 14:34

I got a bottle of Penrite 10 tenths Full Synthetic 2KOST with my Mini Rok, when bought it brand new.  On the labeling it specified specifically it was for Iame and Vortex (amongst others) kart engines. Soley used it from inital run in, and ran an oil ration of 30:1 (Recommended 33:1) and after about 9 hours it gummed the crap out of the ring, along with carbon build up and the pin through the piston was heat effected and blue with discolouration. As my son is not up to full speed,  (ie driving engine to full capabilities) he was only working the engine enough to get mid 14000rpm from it at best.   Engine builder put it down to the oil and ratio I was using.  Have since moved onto a different oil and ratio and so far no dramas. 

Just my experience but dont like the the look of where this is heading.

Comment by Jason Fewins on July 23, 2015 at 1:20

Has anyone  experienced  what appears to be a bubbling and burn reaction on their mini rok exhaust once at a high heat temperature.  Last Saturday after our second practice  session when my son came back into the pits a section of the exhaust pipe looked like it was blistering.  This is the second meeting we have used the engine at so it had been hot before this weekend  without any dramas.  Just curious  if anyone has experienced something similar

 

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