Saito 82 Fuel/Oil/Exhaust Nipple - Which one? - Page 2 - RC Groups
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May 10, 2005, 07:27 PM
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tridim's Avatar
Originally Posted by varmato
Honestly the manual from Saito kinda sucks on their engines and it leaves a couple of obvious things out for those new to four strokes like myself. The break in description is good, but what each screw/part does is not entirely described, hence my original question. is much better than the manual.
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May 11, 2005, 09:39 AM
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pda4you's Avatar
Originally Posted by varmato
So then is then crankcase vent the same as what pumps ask you to tap into a 2 stroke backplate, like the Perry pump design? In other words - hooking up a Perry pump is a no brainer with a Saito given that it already has the tap? Do OS 4 strokes have this vent as well?
Yes OS has them too. look here on page 8.

Two strokes use the vaccuum of the case to suck fuel and air into the chamber. They perry pumps use the positive and negative pressure bursts to run a piston and provide further pressurization.

I have never used a third party pump on a 4 stroke. But OS and YS both use them on production engines with great success.

May 11, 2005, 10:15 AM
S.A.D. member
ivanc's Avatar
On the OS FS70II and FS91II the crankcase vent is connected via a tubing to a nipple on the intake manifold, so all the "mess" goes back into the engine. In fact it's sucked thus improving engine lubrication.
May 11, 2005, 06:02 PM
The reviewer
XJet's Avatar
The HP VT series four-strokes have an even more interesting lubrication system. They have a nipple on the muffler which is used to trap and route oil from exhaust into the moving bits in the head.

Because this engine's top-end is reliant on this oil for proper lubrication, you have to use castor oil -- synthetic simply burns up and produces no exhaust residue.

It's a cunning idea and seems to work very well. I've got quite a few hours on my VT21 now and desite the fact that it's a rotary-valve engine, there's no wear to speak of in the head area.
May 12, 2005, 03:32 AM
Registered User
If you hook a perry pump to the oil drain nipple , the oil will have no were to go, it will build up , first slowing the motor and makeing starting difficult.
the oil needs to drain!!!

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