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First top end job

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May 5, 2007
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#1
Well i think its time i change the piston and rings.But i can only afford the ring till around september.So ive put around 30 or 40 hours on it,Race it once and never did any thing to the topend. for that matter any thing other than chain adjustments and airfilter cleanings.But im pretty sure its ime for a topend job.i have a manual and know how to do it.But im not sure if its got a wieco or stock piston in it.I assume they require differnt rings from what the shop said.Do they and how would i tell if it wiesco or not?Ive been told wiesco will be writen on the under side of the piston.and if i have ring stick do i have to replace the piston to?And is car anti freeze safe to use in my dirt bike?Also i do not have a tourqe wrench will guestimates be ok when tightening the cylinder back down?Any other tips would be appreciated.
 
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#2
I would never mix and match wiseco and oem,if you are using the oem piston,then use oem rings! The wiseco I referenced has a small w on the wrist pin boss,the piston is machined,oem is cast. No torque wrench,first time,this reeks trouble,been there done that,leaks and busted studs,stripped nuts may follow! Derek the 2 stroke,first time on a rebuild,something fishy there!
 
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Sep 30, 2006
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#3
if it's a wiseco piston there should we a w on the underside of the piston under the wrist pin bearing. on a completely different and unrelated topic, I realized we're both named derek and we're the same age which is kinda weird but cool at the same time
 

IndyMX

Crash Test Dummy
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#4
You can pick up an torque wrench for a lot less than it will cost you to repair the damage that will be done in the case that your guestimation is wrong.

Save your nickels and get one. Hey, here's a thought, don't ride for a few weeks. The money you'll save in gas and park/track fees will be enough so that you can buy the required equipment.
 
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Apr 16, 2007
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#5
Do a search on antifreeze, it will bring up what you need. If you have a harbor freight tools close buy you can pick up a wrench for under $20.
 
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Apr 16, 2007
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#8
It must be safe for Aluminum, like Indy said. People will put anything in their bikes and tell you to do the same. Listen to Indy.
 
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Jul 18, 2007
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#9
IndyYZ85 said:
Only if it's formulated for an Aluminum engine. Otherwise, you are asking for a lot of trouble.

this is somthing i'v never really thought about...what kind do you recomend? is that purple ice stuff any good? I'v used it.
 
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May 5, 2007
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#10
whenfoxforks-ruled said:
I would never mix and match wiseco and oem,if you are using the oem piston,then use oem rings! The wiseco I referenced has a small w on the wrist pin boss,the piston is machined,oem is cast. No torque wrench,first time,this reeks trouble,been there done that,leaks and busted studs,stripped nuts may follow! Derek the 2 stroke,first time on a rebuild,something fishy there!
Ha ha nothin fishy,im just fifteen and my parents never trusted me to work on the last bike we had.Ill try to borrow a tourqe wrench.And i figured somebody would have already given me a mouth full on not changin the piston to.Im on a pretty limited budget though ha ha.But how bad can that be?And look under the piston too confirm its wiesco right?Any other little thing I should check for while i got it apart,i know check the reeds and rod thts all right.Its not a powervalved motor.
 
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#11
what kind of motor is it?
check your cylinder for cracks or gouges.
check the surface of your head with a square, to make sure its not warped.
you gotta get a gasket kit too.
 

IndyMX

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#12
j.lawson said:
this is somthing i'v never really thought about...what kind do you recomend? is that purple ice stuff any good? I'v used it.

You can almost bet that if you get it at the bike shop, it'll be ok..

If in doubt, read the label or ask someone at the autoparts store or the bike shop if what you are looking at is safe for aluminum engines.

I use Engine Ice in my bikes.. Seems to work well.
 
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#14
j.lawson said:
what kind of motor is it?
check your cylinder for cracks or gouges.
check the surface of your head with a square, to make sure its not warped.
you gotta get a gasket kit too.
Cant you reuse gaskets?