2 stroke leak down tester

[crustydemon]

Does anyone besides Motion Pro make a good 2 stroke leakdown tester? Looking for a little cheaper one that comes with all the plugs.

[Dave I.]

make one yourself

 

[crustydemon]

I might just do that. I guess I could use my mighty vac pump. Thanks for the pics.

[dajogejr]

This is my friend at RB Porting, Bob...this kit is nice and cheap.

I know the picture only shows one part of it...it is the WHOLE kit, I assure you.

 

http://cgi.ebay.com/ebaymotors/Banshee-Pre...sspagenameZWD1V

[98_shee]

Here's a post on everything you need to make your own.

clicky

[badassbanshee479]

the rb testr is nice, or you can build one your self. Remember you want to pressurize the crank case, not put it in a vacuum. 6psi for 6min and your good to go!

[crustydemon]

the rb testr is nice, or you can build one your self. Remember you want to pressurize the crank case, not put it in a vacuum. 6psi for 6min and your good to go!

 

 

With the mighty vac you can either use it as a vacuum pump or to pressurize. Is 6 min really enough?

[crustydemon]

Yeah thats good, Thank you. It sure beats paying a couple hundred bucks for the same thing.

[badassbanshee479]

yeah. thats all I use on mine, 6psi for 6min. dont go over 6 psi or you can risk blowing out the crank seals!!

 

if it is leaking spray it with soapy water! leave the flywheel and clutch cover off so you can spray the crank seals. also check the key way where the crank drive gear rides. seen um leak there too! I always put alittle sealer on the key way before i install the drive gear and the water pump drive gear.

[dajogejr]

It is ok if it loses less than 1PSI per minute....but no more than that.

generally...if you have a leak...it'll leak right away like letting air out of the tires.

 

When I pressurized my 4 mil, I used soapy water and the left side base gasket was blowin bubbles big time!!

[rubberneck]

Just FYI for anybody looking to do a cub. I got this tip off PS. I had to lightly chamfer the outside edge of my cylinder because it was hitting the case where it flares out ot meet the clutch cover. My cylinder would not go all the way down and sit flush on the cases. It barely interfered, but it would have caused sealing issues.

 

I know i am not probably making sense, but here is a pic which may clear it up a bit, its the lip on the far left of this pic

 

 

Basically the cub cylinder is wider than the stockers and you may need to clearance ever so slightly to get it to clear the case on each side. Clear as Mud

[dajogejr]

I haven't had that specific problem with my 4 or 10 mil on two different set of cases.

 

However...

 

I always get a sanding block and sand the deck to make sure it's flat. My 10 mil was fine, but my 4 mil had a nice dip in the center of it as a result of the media/sand blasting from Millenium. a minute on the sanding block fixed that...

[rubberneck]

Yeah, that is a good tip too. I put a straight edge on mine and it looked good. Like I said, some may not have problems, I just had somebody warn me about it and when I checked sure enough with the cylinders pushed all the way down, they werent seating properly. Hopefully it will help somebody else out.