tomarnold Posted December 16, 2013 Share Posted December 16, 2013 With all this crappy weather I finally got round to decoking my motor and servicing the carb. I was pleasantly surprised to find how easy these jobs were, but unpleasantly surprised by the two scores in the cylinder wall. The piston looks unmarked. My motor (Rad Arrow with Raket 120) has been running absolutely fine, but I'm wondering if I should get this sorted? I'm not experienced in the internals of engines - I've always serviced my own motorbikes and cars, but never messed about with cylinders and pistons before. A new cylinder from Radne is about £250 which seems a bit steep, and I'm not sure it's necessary considering how well the motor was running. Is it expensive (or indeed possible) to have the cylinder replated? Would you just take it to your local motorbike shop? For the time being I have put it all back together so it's ready for when the weather clears up, but I need to know if I ought to be sorting out this cylinder scoring issue. Quote Link to comment Share on other sites More sharing options...
notch Posted December 16, 2013 Share Posted December 16, 2013 if you can catch a fingernail in the scores on the bore then it may be affecting performance a slight amount, but if not, forget about them. Quote Link to comment Share on other sites More sharing options...
enzo200500 Posted December 16, 2013 Share Posted December 16, 2013 There are only two companies in the Uk who carry out the plating. http://www.poetonaptec.co.uk. I have used these before. Very good. They dress and chamfer the port windows nicely. Which should be about 1mm @ 45degrees. http://www.langcourt.com Also get good reports from bike forums. They will both deal direct with you. Just remember to strip ALL steel fittings from the barrel, as the acid used to strip old coating will eat away completely. If you are replacing the piston. Send that with barrel so that they can size the bore correctly to allow for thermal expansion. Always check the port chamfers when the barrel is returned. Otherwise it could end up snagging a ring and buggering the barrel completely!! A diamond file is about the only thing that will dress the plating. Any ally smeared on the barrel (from seized piston) can easily be removed with 1200 wet/dry and lots of water. As stated, if you can feel the scratches with fingernail, ideally its re-plate time. Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted December 16, 2013 Share Posted December 16, 2013 tomarold price from radne http://www.radne.se/en/karting/Product/?PartNo=32085 or exactly the some from here http://www.ebay.co.uk/itm/390349692850? ... 1423.l2648 Quote Link to comment Share on other sites More sharing options...
tomarnold Posted December 16, 2013 Author Share Posted December 16, 2013 tomarold price from radne http://www.radne.se/en/karting/Product/?PartNo=32085or exactly the some from here http://www.ebay.co.uk/itm/390349692850? ... 1423.l2648 Wow, is that really the same cylinder and piston? If so, I think I might have to get one of those! How do you know it's the same? (and thanks for the tip!) Quote Link to comment Share on other sites More sharing options...
tomarnold Posted December 16, 2013 Author Share Posted December 16, 2013 And thanks to enzo200500 for the tips too. Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted December 17, 2013 Share Posted December 17, 2013 99% the same except price Quote Link to comment Share on other sites More sharing options...
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