Hey guys. Started rebuilding this chinarelli the other day after finally getting that stubborn engine long bolt out on my other post haha. . I’ve got the old stage6 streetrace 70cc cast iron cylinder. Piston was worn out with vertical scratches and some are deep enough. Have ordered a new piston kit(pin+bearing, rings, gaskets). Cleaned cylinder head. However when cleaning the cylinder barrel itself I noticed that there are some vertical scratches which doesn’t look deep but can feel it with my fingernail. Can this scratches still be fixed by honing? I am really tempted to scuff it with fine grit but i stopped myself as i might just ruin it for good. Will post pics of it. Thanks
Neogie,hold off until one of the more experienced guys helps out,but some info they will need.some pictures of the piston may help and how "worn out" and where will help.the diagonal lines in the cyl are there by design and should feel like a finger print the vertical lines are the problem,are they scratch able.What do you do with the scoot hobby? or lifeline transport,makes a difference on decisions.
Have i hand honed it right?😂 Should be ready for a new piston and ring?haha. . i cleaned the cylinder with easyoff oven cleaner which worked really well and i managed to get rid of the aluminum sticking to the wall with a little help of scotchbrite. Can still see the vertical lines in the pic but it’s definitely smoother now and can’t feel my fingernail on it. Then hand honed it with a 240 grit sand paper which is what i have in hand. My greatest fear is making the diameter bigger on the cylinder with hand honing but it shouldn’t right and i should be safe?😆
It looks like a runner to me,,Remember that a tight ring seal is only needed from TDC to the top edge of the exhaust port..Make sure its cleaned well of the sanding residue,an oiled white paper towel should come out clean when the bore is wiped,if not,clean some more..Good Job!
Senna1Rossi: Thanks renagade281!
May 23, 2016 14:59:12 GMT -5
Fox: I don't really know how to say this but straight. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. I know he would want ya all to know this. Thank You Brent for befriending my love he was very happy on here!
Jun 18, 2016 16:26:04 GMT -5
Fox: www.gofundme.com/29mgf6b8 I hope it is ok to pass on his gofundme page link. If not you will un-post it I'm sure. Thanks again all!!
Jun 18, 2016 16:31:18 GMT -5