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Old 12-14-2008, 08:09 PM   #1 (permalink)
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1995 ZR580 EFI top end rebuild question.

I just bought a 95 zr580 with 3200 miles on it. I read the stories about the pistions going out so I ordered a Weisco SK1411 Std. top end kit. And also have a service manual from ebay on the way too. But what I need to know is assuming the cylinders walls are in good shape what do I need to do for cylinder prep. Some say just a Scotch brite pad othes say diamond ball others say do nothing at all. Also break in? I have read don't even start it till you can take it out and load the motor to seat the rings. And then how long or hard do I run it before I shut it down? Any help would be great.
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Old 12-15-2008, 08:29 AM   #2 (permalink)
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OK first never order parts till you have it apart and know what you need! Second Weisco are a waste of money! I ordered a set of after market OEM's for my 95 580 and they were about $50 ea and the skirts were even coated! Third on the tipple port jugs be sure to check the exh bridges! Next use a std fine grit hone with lots of oil! Just a few strokes is all it takes! Great time to do a bit of porting too! Just knife edge the bottom of the transfer ports and clean the casting on the exhuast ports too!
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Old 12-15-2008, 06:06 PM   #3 (permalink)
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Are the Wiesco pistons prone to failure or are you saying their just overpriced for what you get?
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Old 12-16-2008, 06:19 AM   #4 (permalink)
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NO,no they are great pistons, just double the money or more in some cases! I have a couple of sleds that Wiesco is the only one that makes pistons for it!
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Old 01-11-2009, 09:14 PM   #5 (permalink)
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New pistons went in and are running great, got around almost 200 miles on them already, thanks for the advice. After much debate I decided not to do any porting (for now)because of the EFI system. Although the intake boots were screaming have the rubber cut back to match the head. I was reluctant to do so because I was of afraid of throwing off the ECU mapping. Besides I'm new to the sled and want to put a season on it before doing any mods.
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Old 01-11-2009, 10:19 PM   #6 (permalink)
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That's pretty smart! Good luck on your season!

Make sure you warm up the engine really well before hitting the throttle hard. Wiseco's are a forged piston, the material is denser than the cast cylinders, which means they will expand faster than the cylinder as they heat. If you take off when the engine is cold, there's a greater chance that the piston will expand into the cylinder wall and "cold seize" the engine.
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