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Post by Deleted on Aug 17, 2013 13:39:34 GMT -5
Your engine is only as good as the piston rings. If they suck, the engine sucks. Through much blood, sweat and tears over the past 3 years I have determined the piston rings that come in the mainland china 50MM BBKs or any of the cheap kits for that matter are to be thrown in the trash, if you use them you are taking a HUGE gamble, your motor may turn out to be a smoker and have to be done over. The options you have are to buy a HOCA piston and ring set from Parts For Scooters and just use the rings. I have had thousands of smoke free miles on these excellent Taiwanese piston rings Several motors I have put Hoca rings in you can ride the piss out of em all day long and never use a drop of oil (the yellow bike in my profile pic now has 2000 miles on hoca rings) China rings you might have 3 in 10 that will smoke like hell and 2 that smoke some and the rest are ok but you never know. I hope this saves someone all the frustration I have been through. The mainland cheap china kits are fine except for the most important part, THE PISTON RINGS. Do yourself a favor and buy good rings. This is not my opinion, this is from direct experience having done at least 50 50mm ebay kits over the past 2-3 yrs. Never again will I use the piston rings that come in those kits ever. Hoca, RIK (Riken) or Wiseco from now on. Oh and if you need top quality rings for your 52mm 90cc 139qmb use Racing Planet NK100.86 those are Riken (Japan)
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Post by Deleted on Aug 17, 2013 22:17:34 GMT -5
Riken 47mm 72cc rings at Racing Planet #NK100.84 Still trying to find a Wiseco #
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Post by Deleted on Aug 25, 2013 13:36:51 GMT -5
What size rings for the 100 cc bbk ? 50mm ? The '100cc' kits are 50mm (82cc) yes GY6-50 39mm bore 49.5cc GY6-70 44mm bore 63cc GY6-80 47mm bore 72cc GY6-100 50mm bore 82cc GY6-110 52.4mm bore 89cc
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Post by Deleted on Aug 28, 2013 22:48:50 GMT -5
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Post by 90GTVert on Aug 29, 2013 11:35:46 GMT -5
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Post by Deleted on Aug 29, 2013 13:14:29 GMT -5
The main reason I posted that was for the filing information and especially whats in 'Illustration 3' about oil ring expander overlay. That is VERY important. If that is done incorrectly it WILL burn oil. Several oil burners I have done myself in the early days of working on scooters and some that owners tried to do themselves that I did over recently for them, the problem was exactly that. Incorrect oil rail expander butts.
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