Case Flush Help?

[burndout]

I've read around a few places and it seems that diesel and kero are the 2 best ways to flush out the case. The piston did NOT come apart nor was there anything wrong with the bottom end, just did the top end and the case got a little dirty while the top end was off. Can I just cycle some diesel or kero through it, about 2-3 gallons? Im not expecting for any big chunks etc, just want to be sure its clean before the new top end is put on and dont have the money for a flywheel puller, case seperater, or crank installer tools.

Also I plan to change the gear oil about 5 times while I do the break in for the top end, any oil you suggest to use? Thanks!

 

[Surfrjag]

you should use the gas oil mix that you put in your fuel tank to clean it out unless you still have your injector hooked up then mix a little in a cup to flush it.

 

[Deerslayer89]

Yamalube 4 poke oil for the tranny.

 

[sicivicdude]

I use premixed gasoline to flush dirt and stuff. It's not thick enough to cut out aluminum chunks but it's good for dust that might have settled in there while it was apart.

If you have larger chunks in there use purple power or mean green and a water hose to get the chunks out and then flush it with premix to get it oily again.

 

[burndout]

I use premixed gasoline to flush dirt and stuff. It's not thick enough to cut out aluminum chunks but it's good for dust that might have settled in there while it was apart.

If you have larger chunks in there use purple power or mean green and a water hose to get the chunks out and then flush it with premix to get it oily again.

Looks like I will be using some premix... seems like the best way. I dont like the idea of water really.. I get where you are coming from but I dont think its something that I will be neededing. I will be putting the top end in today, I will let you know how it goes and get some pics up later, thanks guys!!

 

[sicivicdude]

I don't like the idea of water either but sometimes larger chunks need the detergent and viscosity of water to break pieces loose.

Flushing it with premix is the best alternative to the other chemical choices. Crank seals won't hold up to just any chemical, but they are built to handle gasoline and premix oil.

 

[Blaner]

mmm the day i flush with water will be when im senile and get it mixed up with fuel.. but it has its place and if you oil right away with premix, it should actually be ok

 

[sicivicdude]

Well, it's probably not advisable to try to cheap out and try to flush large chunks out without taking everything apart but I would only recommend detergent and water if it were large chunks that gassoline wouldn't cut out of there....

and if you were to use detergent and water, you would need to IMMEDIATELY flush it back out with liberal amounts of premix.

 

[burndout]

I used the premix and it seemed to work great, first 3 case full's turned a dark nasty color and then started to lighten up. A few pieces of old gasket sealer came out but nothing metal. A good piece of info is to save the last bit of premix oil to coat the new piston, rings, and cylinder walls for the install.

I'm still looking for a PWK or PJ for less than $100, will be checking the oil injection to ensure the gear is out and doing the timing mod soon - then a chain and this thing is ready to rip!!

 

[NEONNIGHT34609]

dont forget to do a leak down test. i tryed to short cut mine. trust me it would have been much easier to do out of the bike.

 

[Larry's Shee]

I spent 4-5 hours cleaning my son's Banshee crank after he sunk it in a mud hole. It ain't good when muddy water pours out when you pull the jug . Dish soap and water, compressed air, PB Blaster, brake clean.

Makes me nervous when you guys use gas for cleaning.

 

[UncagedShadow]

water is perfectly fine to use as long as you follow up immediatley with wd-40 and lots of it. I flushed my cases with soapy water then more and more water. then used a whole can of wd-40 to flush the water. wd-40 stands for water displacement batch 40 for those of you who didnt know this. Not a lubricant. Then I followed up with some premix so it would have lube when i cranked her.