2 stroke Auto Lube

[Chris V]

I,m new here been to BUB last 4 years as team Tracy crew, time to do it myself now does anybody Know if in production engine is factory 2 stroke automatic oiler must operate. I'd really want to mix my one.  Chris   

[JustaRacer]

There are 2 different crank oiling systems for two strokes:

Exposed ball/roller bearing

Force-fed

If it's exposed, fine, remove the injection pump.

Force-fed will destroy the crank.  Not instantly, as roller bearings put up with a lot of abuse, but it will.

IIRC, most all multi-cylinder two-strokes are force-fed.

[manta22]

The 4-cylinder 2-stroke McCulloch engines used in the old Radioplane target drones used a combination of ball & roller bearings on their crankshafts. They used an oil/gasoline fuel mixture. Auto engines may differ since most drivers wouldn't want to have to mix oil into their gas. Check out the old Saab, DKW, etc.

Regards, Neil  Tucson, AZ

[Chris V]

Thanks for responding to the oiling system. lots of older 2 stroks  on the street use a premix oil/gas in fuel tank for precise mixture.my Question is to the AMA rule of "production engine" a'm I required to use the original autolube feature as come from factory. Chris

[Dean Los Angeles]

The rules boil down to the visible and the not visible. Any internals on the engine are fair game.
Anything visible from the outside has to remain. It doesn't have to remain in it's stock form internally. Except the exhaust.
If the oil injection system is visible, it can be plugged internally.

[Chris V]

Thank you Dean, I've also checked with Drew the tech steward at BUB trials he agreed autolube is not needed. Now I need to find stock bore cylinders (64mm) to be in production clsss. Being 358cc I can run Classic but if any Kawi triples show up I,m done Chris

[Glen]

The rules boil down to the visible and the not visible. Any internals on the engine are fair game.
Anything visible from the outside has to remain. It doesn't have to remain in it's stock form internally. Except the exhaust.
If the oil injection system is visible, it can be plugged internally.

Dean, what would intice one to move to Coursegold calif.

[fredvance]

One might ask the same question about moving to St George, UT.

[JustaRacer]

This one is force-fed:

http://cgi.ebay.com/ebaymotors/1972-KAWASAKI-H2-750-TRIPLE-MACH-IV-TOTALLY-RESTORED-BEAUTIFULL-/221142401237?forcev4exp=true#ht_500wt_1180

http://www.3cyl.com/mraxl/manuals/maint/section4.htm

Many of the triples were killed when owners removed the injector pumps and premixed them.  It's one of the reasons they are collectable now.

[ol38y]

Chris, you will also need to either pour your oil directly into your gas tank in front of the erc guys before they seal it or mix it in a gas can and then pour it into your tank there so they can seal it.

[makr]

When you get gas bring a new container of oil. He will seal the oil container as well for later fill ups.

[Chris V]

Thanks For all the response seeing as i'm a newbie to this forum.Yes I knew about sealing tank and oil contianer. I havn't ridden a 2 stroke since I was in high school on a lambretta motor scooter back in 1961. So I'll have to reseach what mixture would be the hot setup, no pun intended, any thoughts  32/ 50/ to 1 or what

[SaltPeter]

Hi Chris

If you are running a Yamaha the Oil is injected into the Inlet so running Pre Mix is safe as long as you use the correct type of oil and the oil/fuel mixture is correct. If you are going to run Pre mix this might help.

You need to re-jet richer as the fuel oil mix has a different density to straight fuel (also more oil produces more power and is safer when re-jetting than running less oil)

Jet up three sizes then do Plug Chops and re -jet until you get good colour then go back one jet richer.
That is because of the long Wide Open Throttle runs can be an issue running 2 Strokes with non Power Jets Carbs and especially an air cooled engine.

(The Suzuki Oil system is injected into the front of the cylinder/piston and the bearings and the pump is usually used even on race bikes unless you intend doing Race Bike type maintenance. I run a pump on my Suzi)



Pete

[Chris V]

Thanks Pete, yes I'm sure jetting will be an issue as I am at sea level here in California and bonnie at 5K. I'm working on making a leak down tester to check case seals at the moment. still looking for stock bore cylinders for (P) class, checked only 1 place so far for new sleeves big bucks about $225. per cylinder. I'd like to find a junkyard R5 Yamaha !!  anybody got one???   

[makr]

I run about 50 to one on my rd400.

I have a bunch of R5 cylinders. I will need to dig them out to measure the bores.


Pete, why does more oil produce more power?