Help! Wiseco specs

[2hundredx]

Im getting ready to buy a 67mm wiseco pro lite piston kit for my 85 250r. What are the clearance specs. Any other info would be helpful too. Here is the kit i wanna get- http://cgi.ebay.com/ebaymotors/Wiseco-Piston-Kit-Honda-ATC250R-85-86-67mm-_W0QQcmdZViewItemQQhashZitem4cefbfe7d1QQitemZ33043 9845841QQptZMotorsQ5fATVQ5fPartsQ5fAccessories
thanks, collin

[2hundredx]

alright guys im getting desperate. i know someone on here knows the specs! thanks, collin

[Tecate 50]

Have you purchased the piston yet? If so, the clearance's will be posted with the piston....either on the box or on the paper work included with the piston. I wouldn't have the cylinder machined (boring) until you get the piston required. Pistons vary on clearance's depending on the bore size. Hope this helps for now!

[BGP]

What size are you replacing? Make sure the 67mm will allow you to clean the bore correctly. Some grooves get pretty deep; especially at the ring keepers, above the inlet port. They also get a pretty good "shadow" around and below that same port...

Regardless, Wiseco will call for .003" on that box. It's really up to you to decide if you are comfortable with that, being that it's a Wiseco (fored piston). My opinion is that if you stick to .003" you best not be ham fisted with the throttle when it's cold.

[2hundredx]

BGP would you keep with the .003 clearance or what would you do? thank you guys for the info though i appreciate it. collin

[BGP]

BGP would you keep with the .003 clearance or what would you do? thank you guys for the info though i appreciate it. collin

Personally, for that size, I like .0035~.004 on a Wiseco. I do, however, tear down and inspect regularly.

Like I said; it's up to you and depends on your riding style. If you fire it up and go hard, stick to .004 and service it. If you do a break in, warm it up religiously and prefer to just fuel it up and foget the rest, .003 will do.

Btw, if you're rebuiling in a cold environment, make sure that all parts are at the same temp when measured. Also, reassemble the entire bike and fill the carb. LAST THING you should do before first fire up is fill the engine with HOT coolant. I mean HOT! Let the engine soak some heat and fire it up. Look for leaks and listen for strange/abnormal sounds. If none are found, warm it up with varying rpms until you can barely hold your hand to the cylinder. Shut down and let cool fully. Repeat start up, WARM UP and go grab some short hand fulls of throttle in a higher than normal gear up to top end. Shut down and cool completely.

Why? Fresh rings in a fresh bore at cold temperature will microseize once the engine reaches dew point. Don't believe it, start it up cold for 30 seconds, kill it and look down the plug hole. White crap everywhere right? Condensation mixed with the oil will not let your rings seat in properly in those crucial first seconds/minute. If you're in a warm (20C+) shop, don't worry.

That is all.

[oscarmayer]

yea on high comp stuff your far better off with .0035 trhan .003 as weisco's like to swell. they say 3 on everything frmo NA high comp 4-stroke to 2-stroke to turbo pistons. so it's just a basic setting they use.