90Bansheedude Posted June 7, 2009 Author Report Posted June 7, 2009 I just put a new set of Wisecos in my bike and was looking at the instruction sheet thats included with the piston kit and I read the same damn "drill two holes" line. I was like... "fuck that shit, I ain't drillin my shiny new pistons". What is this about? Any body have a clue? Yah, Ragun, sorry bout that, gotta get used to the new forum. Quote
Meat Posted June 7, 2009 Report Posted June 7, 2009 What is this about? Any body have a clue? "Lubrication holes (2-cycle engines) If the cylinder has an exhaust bridge, the piston should contain lubrication holes on the skirt where it contacts the exhaust bridge. If the piston does not have the lubrication holes on the skirt, follow these steps to drill the lubrication holes. 1. Install the piston and wrist pin on the connecting rod using one circlip. 2. Slide the cylinder over the piston and align it to its normal position on the crankcase. 3. Slowly turn the engine over until the bottom ring groove is at the top of the exhaust bridge. 4. Reach through the exhaust port with a pencil, and mark a vertical line on the piston on both sides of the exhaust skirt. 5. Remove the cylinder and piston, and drill 2 holes (.060 - .090 Quote
90Bansheedude Posted June 7, 2009 Author Report Posted June 7, 2009 "Lubrication holes (2-cycle engines) If the cylinder has an exhaust bridge, the piston should contain lubrication holes on the skirt where it contacts the exhaust bridge. If the piston does not have the lubrication holes on the skirt, follow these steps to drill the lubrication holes. 1. Install the piston and wrist pin on the connecting rod using one circlip. 2. Slide the cylinder over the piston and align it to its normal position on the crankcase. 3. Slowly turn the engine over until the bottom ring groove is at the top of the exhaust bridge. 4. Reach through the exhaust port with a pencil, and mark a vertical line on the piston on both sides of the exhaust skirt. 5. Remove the cylinder and piston, and drill 2 holes (.060 - .090 Quote
Meat Posted June 7, 2009 Report Posted June 7, 2009 Yes, i saw that, im the one who posted the link. What is an exhaust bridge? Do banshees need this or not? It the first time ive heard of this. There's no exhaust bridge in a Banshee cylinder, so the piston drillin is not necessary. Quote
90Bansheedude Posted June 7, 2009 Author Report Posted June 7, 2009 There's no exhaust bridge in a Banshee cylinder, so the piston drillin is not necessary. Ok, thanks, thats why ive not heard of it before! LOL Quote
mopar1rules Posted June 7, 2009 Report Posted June 7, 2009 (edited) yeah, that piston drilling is for lubrication on bridged exhaust ports. very common mod on 250R hondas. not needed on a banshee, as there is no bridged exhaust port. Edited June 7, 2009 by mopar1rules Quote
RZBansheeMan Posted June 7, 2009 Report Posted June 7, 2009 I went thru the same thing, wondering about drilling the holes on the exhaust side of the piston, when I rebuilt the 1985 250r motor I had. Come to find out that the earlier 250r 3 wheeler motors "85" - "86" didn't have the exhaust bridge, I think they started that in 1987. Quote
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